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PubMed1987

Characterization of disulfide bonds in recombinant proteins: reduced human interleukin 2 in inclusion bodies and its oxidative refolding.

Cloned cDNA of human interleukin 2 (IL-2) was expressed in Escherichia coli cells in which IL-2 formed insoluble inclusion bodies. Human IL-2 has three Cys residues, namely, Cys-58, Cys-105, and Cys-125, and native IL-2 has an intramolecular disulfide bond between Cys-58 and Cys-105. Since the formation of inclusion bodies was thought to be due to disorder in the oxidation state of these Cys residues, all intramolecular disulfide bond isomers of IL-2 were prepared by denaturation of native IL-2 to characterize the state of a disulfide bond in IL-2 in the inclusion bodies. These isomers can be separated from native IL-2, reduced IL-2, and IL-2's with intermolecular disulfide bonds by means of reversed-phase high-performance liquid chromatography. Human IL-2 produced in inclusion bodies in E. coli carrying a recombinant DNA was analyzed by HPLC and was proved to be a fully reduced form with no intra- and intermolecular disulfide bonds. Refolding of reduced IL-2 in the presence of reduced and oxidized glutathione and a low concentration of guanidine hydrochloride resulted in the formation of the biologically active IL-2 quantitatively. Further purification provided a practically pure IL-2 preparation without contamination of any disulfide bond isomers.

Amino Acid Sequence↗
PubMedDate not supplied

Measuring the interaction forces between protein inclusion bodies and an air bubble using an atomic force microscope.

Interaction forces between protein inclusion bodies and an air bubble have been quantified using an atomic force microscope (AFM). The inclusion bodies were attached to the AFM tip by covalent bonds. Interaction forces measured in various buffer concentrations varied from 9.7 nN to 25.3 nN (+/- 4-11%) depending on pH. Hydrophobic forces provide a stronger contribution to overall interaction force than electrostatic double layer forces. It also appears that the ionic strength affects the interaction force in a complex way that cannot be directly predicted by DLVO theory. The effects of pH are significantly stronger for the inclusion body compared to the air bubble. This study provides fundamental information that will subsequently facilitate the rational design of flotation recovery system for inclusion bodies. It has also demonstrated the potential of AFM to facilitate the design of such processes from a practical viewpoint.

Air↗
PubMedDate not supplied

Production of nonclassical inclusion bodies from which correctly folded protein can be extracted.

Human granulocyte-colony stimulating factor (hG-CSF), an important biopharmaceutical drug used in oncology, is currently produced mainly in Escherichia coli. Expression of human hG-CSF gene in E. coli is very low, and therefore a semisynthetic, codon-optimized hG-CSF gene was designed and subcloned into pET expression plasmids. This led to a yield of over 50% of the total cellular proteins. We designed a new approach to biosynthesis at low temperature, enabling the formation of "nonclassical" inclusion bodies from which correctly folded protein can be readily extracted by nondenaturing solvents, such as mild detergents or low concentrations of polar solvents such as DMSO and nondetergent sulfobetaines. FT-IR analysis confirmed different nature of inclusion bodies with respect to the growth temperature and indicated presence of high amounts of very likely correctly folded reduced hG-CSF in nonclassical inclusion bodies. The yield of correctly folded, functional hG-CSF obtained in this way exceeded 40% of the total hG-CSF produced in the cells and is almost completely extractable under nondenaturing conditions. The absence of the need to include a denaturation/renaturation step in the purification process allows the development of more efficient processes characterized by higher yields and lower costs and involving environment-friendly technologies. The technology presented works successfully at the 50-L scale, producing nonclassical inclusion bodies of the same quality. The approach developed for the production of hG-CSF could be extended to other proteins; thus, a broader potential for industrial exploitation is envisaged.

Blotting, Western↗
PubMed1998

delta-Endotoxin proteins associated with spherical parasporal inclusions of the four Lepidoptera-specific Bacillus thuringiensis strains.

Four Lepidoptera-specific reference strains of Bacillus thuringiensis, belonging to serovars sumiyoshiensis (H3a:3d), fukuokaensis (H3a:3d:3e), darmstadiensis (H10a:10b) and japonensis (H23), which produce spherical parasporal inclusions, were examined for comparative characterization of delta-endotoxins. SDS-PAGE profiles of the alkali-solubilized parasporal inclusions revealed the presence of single major protein bands of 130 kDa in the four strains. Chymotrypsin and trypsin treatment of the proteins gave profiles different from those of the strains HD-1 (serovar kurstaki, H3a:3b:3c) and T84 A1 (serovar sotto, H4a:4b). Also, minor variations were observed in proteolysis profiles among the four strains. The LC50 values of purified parasporal inclusions for the silkworm (Bombyx mori) larvae were 7.35, 6.45, 3.08 and 2.63 micrograms g-1 diet, respectively, showing that their toxicity levels were 5-15 times lower than that of the strain HD-1 (0.49 microgram g-1 diet). Analysis by immunodiffusion and immunoblotting with polyclonal antisera revealed that parasporal inclusion proteins of the four strains are highly related, whereas they shared few or no common antigens with those of the strains HD-1, T84 A1 and Buibui (serovar japonensis).

Animals↗
PubMed1997

Chlamydia psittaci IncA is phosphorylated by the host cell and is exposed on the cytoplasmic face of the developing inclusion.

Chlamydiae are obligate intracellular bacteria that replicate within a non-acidified vacuole called an inclusion. Chlamydia psittaci (strain GPIC) produces a 39 kDa protein (IncA) that is localized to the inclusion membrane. While IncA is present as a single 39 kDa species in purified reticulate bodies, two additional higher M(r) forms are found in C. psittaci-infected cells. This finding suggested that IncA may be post-translationally modified in the host cell. Here we present evidence that IncA is a serine/threonine phosphoprotein that is phosphorylated by host cell enzymes. This conclusion is supported by the following experimental findings: (i) treatment of infected cells with inhibitors of host cell phosphatases or kinases altered the electrophoretic migration pattern of IncA; (ii) treatment with calf intestinal alkaline phosphatase eliminated the multiple-banding pattern of IncA, leaving only the protein band with the lowest relative molecular weight; and (iii) radioimmunoprecipitation of lysates of [32P]-orthophosphate-labelled infected HeLa cells with anti-IncA antisera demonstrated that the two highest M(r) IncA bands were phosphorylated. A vaccinia-virus recombinant expressing incA was used to determine if HeLa cells can phosphorylate IncA in the absence of a chlamydial background. IncA in lysates of these cells migrated identically to that seen in C. psittaci-infected cells, indicating the host cell was responsible for the phosphorylation of the protein. Microinjection of fluorescently labelled anti-IncA antibodies into C. psittaci-infected HeLa cells resulted in immunostaining of the outer face of the inclusion membrane. Collectively, these results demonstrate that IncA is phosphorylated by the host cell, and regions of IncA are exposed at the cytoplasmic face of the inclusion.

Animals↗
PubMed2001

Mammalian 14-3-3beta associates with the Chlamydia trachomatis inclusion membrane via its interaction with IncG.

Chlamydiae replicate intracellularly within a vacuole that is modified early in infection to become fusogenic with a subset of exocytic vesicles. We have recently identified four chlamydial inclusion membrane proteins, IncD-G, whose expression is detected within the first 2 h after internalization. To gain a better understanding of how these Inc proteins function, a yeast two-hybrid screen was employed to identify interacting host proteins. One protein, 14-3-3beta, was identified that interacted specifically with IncG. The interaction between 14-3-3beta and IncG was confirmed in infected HeLa cells by indirect immunofluorescence microscopy and interaction with a GFP-14-3-3beta fusion protein. 14-3-3 proteins are phosphoserine-binding proteins. Immunoprecipitation studies with [32P]-orthophosphate-labelled cells demonstrated that IncG is phosphorylated in both chlamydia-infected HeLa cells and in yeast cells expressing IncG. Site-directed mutagenesis of predicted 14-3-3 phosphorylation sites demonstrated that IncG binds to 14-3-3beta via a conserved 14-3-3-binding motif (RS164RS166F). Finally, indirect immunofluorescence demonstrated that 14-3-3beta interacts with Chlamydia trachomatis inclusions but not C. psittaci or C. pneumoniae inclusions. 14-3-3beta is the first eukaryotic protein found to interact with the chlamydial inclusion; however, its unique role in C. trachomatis pathogenesis remains to be determined.

14-3-3 Proteins↗
PubMed2000

A secondary structure motif predictive of protein localization to the chlamydial inclusion membrane.

Chlamydiae are obligate intracellular pathogens that spend their entire growth phase sequestered in a membrane-bound vacuole called an inclusion. A set of chlamydial proteins, labelled Inc proteins, has been identified in the inclusion membrane (IM). The predicted IncA, IncB and IncC amino acid sequences share very limited similarity, but a common hydrophobicity motif is present within each Inc protein. In an effort to identify a relatively complete catalogue of Chlamydia trachomatis proteins present in the IM of infected cells, we have screened the genome for open reading frames encoding this structural motif. Hydropathy plot analysis was used to screen each translated open reading frame in the C. trachomatis genome database. Forty-six candidate IM proteins (C-lncs) that satisfied the criteria of containing a bilobed hydrophobic domain of at least 50 amino acids were identified. The genome of Chlamydia pneumoniae encodes a larger collection of C-lnc proteins, and only approximately half of the C-lncs are encoded within both genomes. In order to confirm the hydropathy plot screening method as a valid predictor of C-lncs, antisera and/or monoclonal antibodies were prepared against six of the C. trachomatis C-lncs. Immunofluorescence microscopy of C. trachomatis-infected cells probed with these antibodies showed that five out of six C-lncs are present in the chlamydial IM. Antisera were also produced against C. pneumoniae p186, a protein sharing identity with Chlamydia psittaci lncA and carrying a similar bilobed hydrophobic domain. These antisera labelled the inclusion membrane in C. pneumoniae infected cells, confirming that proteins sharing the unique secondary structural characteristic also localize to the inclusion membrane of C. pneumoniae. Sera from patients with high-titre antibodies to C. trachomatis were examined for reactivity with each tested C-lnc protein. Three out of six tested C-lncs were recognized by a majority of these patient sera. Collectively, these studies identify and characterize novel proteins localized to the chlamydial IM and demonstrate the existence of a potential secondary structural targeting motif for localization of chlamydial proteins to this unique intracellular environment.

Amino Acid Sequence↗
PubMed2001

Proteasomal inhibition leads to formation of ubiquitin/alpha-synuclein-immunoreactive inclusions in PC12 cells.

Proteasomal dysfunction has been recently implicated in the pathogenesis of several neurodegenerative diseases, including Parkinson's disease and diffuse Lewy body disease. We have developed an in vitro model of proteasomal dysfunction by applying pharmacological inhibitors of the proteasome, lactacystin or ZIE[O-tBu]-A-leucinal (PSI), to dopaminergic PC12 cells. Proteasomal inhibition caused a dose-dependent increase in death of both naive and neuronally differentiated PC12 cells, which could be prevented by caspase inhibition or CPT-cAMP. A percentage of the surviving cells contained discrete cytoplasmic ubiquitinated inclusions, some of which also contained synuclein-1, the rat homologue of human alpha-synuclein. However the total level of synuclein-1 was not altered by proteasomal inhibition. The ubiquitinated inclusions were present only within surviving cells, and their number was increased if cell death was prevented. We have thus replicated, in this model system, the two cardinal pathological features of Lewy body diseases, neuronal death and the formation of cytoplasmic ubiquitinated inclusions. Our findings suggest that inclusion body formation and cell death may be dissociated from one another.

Acetylcysteine↗
PubMed2006

Pharmacological promotion of inclusion formation: a therapeutic approach for Huntington's and Parkinson's diseases.

Misfolded proteins accumulate in many neurodegenerative diseases, including huntingtin in Huntington's disease and alpha-synuclein in Parkinson's disease. The disease-causing proteins can take various conformations and are prone to aggregate and form larger cytoplasmic or nuclear inclusions. One approach to the development of therapeutic intervention for these diseases has been to identify chemical compounds that reduce the size or number of inclusions. We have, however, identified a compound that promotes inclusion formation in cellular models of both Huntington's disease and Parkinson's disease. Of particular interest, this compound prevents huntingtin-mediated proteasome dysfunction and reduces alpha-synuclein-mediated toxicity. These results demonstrate that compounds that increase inclusion formation may actually lessen cellular pathology in both Huntington's and Parkinson's diseases, suggesting a therapeutic approach for neurodegenerative diseases caused by protein misfolding.

Amino Acid Sequence↗
PubMed1994

Mitochondrial creatine kinase: a major constituent of pathological inclusions seen in mitochondrial myopathies.

Overaccumulation of abnormally organized mitochondria in so-called "ragged-red" skeletal muscle fibers is a morphological hallmark of mitochondrial myopathies, in particular of mitochondrial encephalomyopathies. Characteristic for the abnormal mitochondria is the occurrence of highly ordered crystalline inclusions. Immuno-electron microscopy revealed that these inclusions react heavily with specific antibodies against mitochondrial creatine kinase (Mi-CK). Image processing of selected crystalline inclusions, sectioned along the crystallographic b, c planes, resulted in an averaged picture displaying an arrangement of regular, square-shaped particles with a central cavity. The overall appearance, dimensions, and symmetry of these building blocks are very reminiscent of single isolated Mi-CK octamers. Taking these findings together, it is concluded that Mi-CK octamers indeed represent the major, if not the only, component of these mitochondrial inclusions.

Creatine Kinase↗
PubMed2006

Circovirus inclusion bodies in intestinal muscle cells of a canary.

Multiple cytoplasmic inclusion bodies were observed in the intestinal smooth muscle cells of an adult canary from an aviary with a history of high mortality (50%) both in adult and young birds. Grossly, a mild enteritis was the only lesion appreciable. Smears of the proventricular contents contained a few megabacteria (Macrorhabdus ornithogaster). The intestinal inclusions were found in very high numbers in all parts of the tract examined. They appeared round to oval, amphophilic and hyaline in sections stained with haematoxylin and eosin, and magenta with Feulgen stain. Inclusions of the same type were occasionally detectable in the wall of a few splenic and pancreatic arteries. No inclusions or lesions were seen in the other organs examined. Transmission electron microscopy of the intestinal wall revealed circovirus-like particles either in paracrystalline arrays or loose arrangements, mostly within the cytoplasm of the intestinal muscule cells. Polymerase chain reaction amplification and sequence analysis confirmed infection with canary circovirus.

Animals↗
PubMed2000

New consensus research on neuropathological aspects of familial amyotrophic lateral sclerosis with superoxide dismutase 1 (SOD1) gene mutations: inclusions containing SOD1 in neurons and astrocytes.

Amyotrophic lateral sclerosis (ALS) is a progressive neurodegenerative disease that primarily involves the motor neuron system. Approximately 5-10% of ALS is familial. Superoxide dismutase 1 (SOD1) gene mutations are shown to be associated with about 20% of familial ALS (FALS) patients. The neuronal Lewy-body-like hyaline inclusion (LBHI) and astrocytic hyaline inclusion (Ast-HI) are morphological hallmarks of certain SOD1-linked FALS patients with SOD1 gene mutant and transgenic mice expressing human SOD1 with G85R mutation. From the detailed immunohistochemical analyses, the essential common protein of both inclusions is SOD1. Ultrastructurally, both inclusions consist of granule-coated fibrils 15-25 nm in diameter. Based on the immuno-electron microscopical finding that these abnormal granule-coated fibrils are positive for SOD1, the formation (or aggregation) of the abnormal fibrils containing SOD1 would be essential evidence in diseases caused by various SOD1 mutations. The granule-coated fibrils are also modified by advanced glycation end products (AGEs). The AGEs themselves are insoluble molecules with direct toxic effects on cells. AGE formation of SOD1 composing the granule-coated fibrils (probable AGE-modified mutant SOD1) may amplify their aggregation and produce a more marked toxicity.

Amyotrophic Lateral Sclerosis↗
PubMed1991

Adult rat cardiomyocytes cultured in creatine-deficient medium display large mitochondria with paracrystalline inclusions, enriched for creatine kinase.

In adult regenerating cardiomyocytes in culture, in contrast to fetal cells, mitochondrial creatine kinase (Mi-CK) was expressed. In the same cell, two populations of mitochondria, differing in shape, in distribution within the cell and in content of Mi-CK, could be distinguished. Immunofluorescence studies using antibodies against Mi-CK revealed a characteristic staining pattern for the two types of mitochondria: giant, mostly cylindrically shaped, and, as shown by confocal laser light microscopy, randomly distributed mitochondria exhibited a strong signal for Mi-CK, whereas small, "normal" mitochondria, localized in rows between myofibrils, gave a much weaker signal. Transmission EM of the giant mitochondria demonstrated paracrystalline inclusions located between cristae membranes. Immunogold labeling with anti-Mi-CK antibodies revealed a specific decoration of these inclusions for Mi-CK. Addition of 20 mM creatine, the substrate of Mi-CK, to the essentially creatine-free culture medium caused the disappearance of the giant cylindrically shaped mitochondria as well as of the paracrystalline inclusions, accompanied by an increase of the intracellular level of total creatine. Replacement of creatine in the medium by the creatine analogue and competitor beta-guanidinopropionic acid caused the reappearance of the enlarged mitochondria. It is believed that the accumulation of Mi-CK within the paracrystalline inclusions, similar to those observed in certain myopathies, represents a compensatory effect of the cardiomyocytes to cope with a metabolic stress situation caused by low intracellular total creatine levels.

Animals↗
PubMed1996

Sphingolipids and glycoproteins are differentially trafficked to the Chlamydia trachomatis inclusion.

Chlamydia trachomatis is an obligate intracellular pathogen that multiples within the confines of a membrane-bound vacuole called an inclusion. Approximately 40-50% of the sphingomyelin synthesized from exogenously added NBD-ceramide is specifically transported from the Golgi apparatus to the chlamydial inclusion (Hackstadt, T., M.A. Scidmore, and D.D. Rockey. 1995. Proc. Natl. Acad. Sci. USA. 92: 4877-4881). Given this major disruption of a cellular exocytic pathway and the similarities between glycolipid and glycoprotein exocytosis, we wished to determine whether the processing and trafficking of glycoproteins through the Golgi apparatus to the plasma membrane in chlamydia-infected cells was also disrupted. We analyzed the processing of several model glycoproteins including vesicular stomatitis virus G-protein, transferrin receptor, and human histocompatibility leukocyte class I antigen. In infected cells, the posttranslational processing and trafficking of these specific proteins through the Golgi apparatus and subsequent transport to the plasma membrane was not significantly impaired, nor were these glycoproteins found associated with the chlamydial inclusion membrane. Studies of receptor recycling from endocytic vesicles employing fluorescently and HRP-tagged transferrin and anti-transferrin receptor antibody revealed an increased local concentration of transferrin and transferrin receptor around but never within the chlamydial inclusion. However, Scatchard analysis failed to show either an increased intracellular accumulation of transferrin receptor or a decreased number of plasma membrane receptors in infected cells. Furthermore, the rate of exocytosis from the recycling endosomes to the plasma membrane was not altered in chlamydia-infected cells. Thus, although C. trachomatis disrupts the exocytosis of sphingolipids and the Golgi apparatus appears physically distorted, glycosylation and exocytosis of representative secreted and endocytosed proteins are not disrupted. These results suggest the existence of a previously unrecognized sorting of sphingolipids and glycoproteins in C. trachomatis-infected cells.

4-Chloro-7-nitrobenzofurazan↗
PubMed2000

Active caspases and cleaved cytokeratins are sequestered into cytoplasmic inclusions in TRAIL-induced apoptosis.

Tumor necrosis factor-related apoptosis- inducing ligand (TRAIL) -induced apoptosis, in transformed human breast epithelial MCF-7 cells, resulted in a time-dependent activation of the initiator caspases-8 and -9 and the effector caspase-7. Cleavage of caspase-8 and its preferred substrate, Bid, preceded processing of caspases-7 and -9, indicating that caspase-8 is the apical initiator caspase in TRAIL-induced apoptosis. Using transient transfection of COOH-terminal-tagged green fluorescent protein fusion constructs, caspases-3, -7, and -8 were localized throughout the cytoplasm of MCF-7 cells. TRAIL-induced apoptosis resulted in activation of caspases-3 and -7, and the redistribution of most of their detectable catalytically active small subunits into large spheroidal cytoplasmic inclusions, which lacked a limiting membrane. These inclusions, which were also induced in untransfected cells, contained cytokeratins 8, 18, and 19, together with both a phosphorylated form and a caspase-cleavage fragment of cytokeratin 18. Similarly, in untransfected breast HBL100 and lung A549 epithelial cells, TRAIL induced the formation of cytoplasmic inclusions that contained cleaved cytokeratin 18 and colocalized with active endogenous caspase-3. We propose that effector caspase-mediated cleavage of cytokeratins, resulting in disassembly of the cytoskeleton and formation of cytoplasmic inclusions, may be a characteristic feature of epithelial cell apoptosis.

Apoptosis↗
PubMed2004

A polyalanine tract expansion in Arx forms intranuclear inclusions and results in increased cell death.

A growing number of human disorders have been associated with expansions of a tract of a single amino acid. Recently, polyalanine (polyA) tract expansions in the Aristaless-related homeobox (ARX) protein have been identified in a subset of patients with infantile spasms and mental retardation. How alanine expansions in ARX, or any other transcription factor, cause disease have not been determined. We generated a series of polyA expansions in Arx and expressed these in cell culture and brain slices. Transfection of these constructs results in nuclear protein aggregation, filamentous nuclear inclusions, and an increase in cell death. These inclusions are ubiquitinated and recruit Hsp70. Coexpressing Hsp70 decreases the percentage of cells with nuclear inclusions. Finally, we show that expressing mutant Arx in mouse brains results in neuronal nuclear inclusion formation. Our data suggest expansions in one of the ARX polyA tracts results in nuclear protein aggregation and an increase in cell death; likely underlying the pathogenesis of the associated infantile spasms and mental retardation.

Animals↗
PubMed2001

Quantitative culture of Chlamydia trachomatis: relationship of inclusion-forming units produced in culture to clinical manifestations and acute inflammation in urogenital disease.

The relationship of Chlamydia trachomatis inclusion-forming units in quantitative culture to clinical manifestations and inflammation in urogenital disease was assessed in 1179 patients attending a sexually transmitted diseases clinic. In women, greater inclusion-forming unit counts were associated with cervical mucopus (3000 vs. 450 ifu), amount and character of cervical discharge, > or =30 polymorphonuclear cells (PMNL) per high-power field (hpf) on Gram stain (2050 vs. 320 ifu), and diagnoses of mucopurulent cervicitis (MPC; 2550 vs. 300 ifu) and pelvic inflammatory disease (PID; 3000 vs. 578 ifu). In men, greater inclusion-forming unit counts were associated with urethral discharge (85 vs. 44 ifu), amount and character of discharge, and > or =10 PMNL/hpf (95 vs. 50 ifu). These associations persisted on multivariate analysis. Thus, chlamydial replication is associated with MPC and PID in women, urethritis in men, and inflammation in both. Since infections with high inclusion counts may be the most transmissible, identification and treatment of patients with these chlamydia-associated syndromes is important in control programs.

Adult↗
PubMed2005

Cytoplasmic inclusion bodies are detected by synthetic antibody in ciliated bronchial epithelium during acute Kawasaki disease.

BACKGROUND: In developed nations, Kawasaki disease (KD) is the most common cause of acquired heart disease in children. An infectious etiology is likely but has not yet been identified. We have previously reported that oligoclonal immunoglobulin A plasma cells infiltrate acute KD tissues and that synthetic KD antibodies detect a distinctive spheroidal antigen in acute KD ciliated bronchial epithelium. METHODS: To further characterize the antigen in acute KD bronchi, we examined paraffin-embedded ciliated bronchial epithelium using light microscopy (LM) and transmission electron microscopy (TEM). RESULTS: The spheroids observed by immunohistochemistry (IHC) are visualized as inclusion bodies with hematoxylin-eosin and nucleic acid stains and in methylene blue/azure II/basic fuchsin trichrome-stained plastic sections, suggesting the presence of both protein and nucleic acid. The structures visualized by LM correspond to homogeneous electron-dense perinuclear inclusion bodies (up to 1.4 microns in diameter) in ciliated bronchial epithelium from 4 patients with acute KD examined by TEM. Inclusion bodies were not present in control bronchial epithelium or in nonciliated cells. CONCLUSIONS: The antigen detected in acute KD ciliated bronchial epithelium by IHC with synthetic KD antibodies resides in cytoplasmic inclusion bodies that are consistent with aggregates of viral proteins and associated nucleic acid and may derive from the etiologic agent of KD.

Antibodies, Monoclonal↗