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Biomedical subjects

A Gray

Publications and source records attributed to A Gray.

At least 217 records · Page 12Linked to original sources
PubMed1986

Insulin-like growth factor I receptor primary structure: comparison with insulin receptor suggests structural determinants that define functional specificity.

To identify structural characteristics of the closely related cell surface receptors for insulin and IGF-I that define their distinct physiological roles, we determined the complete primary structure of the human IGF-I receptor from cloned cDNA. The deduced sequence predicts a 1367 amino acid receptor precursor, including a 30-residue signal peptide, which is removed during translocation of the nascent polypeptide chain. The 1337 residue, unmodified proreceptor polypeptide has a predicted Mr of 151,869, which compares with the 180,000 Mr IGF-I receptor precursor. In analogy with the 152,784 Mr insulin receptor precursor, cleavage of the Arg-Lys-Arg-Arg sequence at position 707 of the IGF-I receptor precursor will generate alpha (80,423 Mr) and beta (70,866 Mr) subunits, which compare with approximately 135,000 Mr (alpha) and 90,000 Mr (beta) fully glycosylated subunits.

Amino Acid Sequence↗
PubMed1985

Tyrosine kinase receptor with extensive homology to EGF receptor shares chromosomal location with neu oncogene.

A novel potential cell surface receptor of the tyrosine kinase gene family has been identified and characterized by molecular cloning. Its primary sequence is very similar to that of the human epidermal growth factor receptor and the v-erbB oncogene product; the chromosomal location of the gene for this protein is coincident with the neu oncogene, which suggests that the two genes may be identical.

Animals↗
PubMed1985

Some myths in the demography of aboriginal Australians.

The author discusses the proliferation of stereotypes and myths concerning the demography of aboriginal Australians. "In this paper, four of these myths will be discussed, in the hope that a basis for constructive analysis of recent and historical demographic change can be laid." The myths considered pertain to the validity of studying aboriginal societies that have been in contact with non-aboriginal societies, disorder in the aboriginal family, the study of aborigines as a third world population, and the relationship between high fertility and aboriginal poverty.

Australia↗
PubMed1985

Lowry protein determination by automated flow injection analysis for bovine serum albumin and hepatitis B surface antigen.

The Lowry method for quantitation of protein was adapted to automated flow injection analysis. The procedure was developed using two different pure proteins: bovine serum albumin and hepatitis B surface antigen. The system was optimized for reagent concentration, pH, gain, temperature, sample volume, and output. The response of each protein was affected differently by temperature. The reaction slopes and absorbance values of the proteins were similar at 90 degrees C to allow quantitation of hepatitis surface antigen against bovine serum albumin. Advantages of the automated flow injection analysis Lowry procedure include: rapid analyses (90 samples/h), small sample volume (30 microliters, 100 microliters), fast response (20 s), reproducibility (less than or equal to 2% CV within an assay and 3 to 6% CV among assays), sensitivity (5 micrograms), and high correlation (99.8%) with manual assay. After a 30-min set-up period, the analyzer was available to assay protein on demand throughout the day, making it suitable for process and quality control testing.

Animals↗
PubMed1984

Health of prisoners admitted to and discharged from Bedford Prison.

The age, smoking and drinking habits, active health problems, and occupational fitness of prisoners entering Bedford prison, and the health and willingness of prisoners being discharged from prison to take a letter to their general practitioner were surveyed. This group of men had a high level of illness, neglected their health, and had a high alcohol intake. Fewer problems were found than in a survey in New York City. Many prisoners with active medical problems on discharge from prison were unwilling to take a letter to their own general practitioner.

Adult↗
PubMed1984

Isolation of the human insulin-like growth factor I gene using a single synthetic DNA probe.

A single synthetic oligonucleotide was employed as hybridization probe to detect and enable isolation of the human insulin-like growth factor I (IGF-I) gene from a human genomic DNA library. The synthetic oligonucleotide probe coded for the B-chain of IGF-I and was designed for expression in Escherichia coli. Despite numerous interspersed mismatches, the synthetic probe hybridized specifically with seven recombinant lambda phage containing almost the entire B-chain region of the human IGF-I gene. The usefulness of this approach was further demonstrated by the detection of lambda phage containing human preproinsulin, using A and B chain synthetic oligonucleotides, 90 and 63 nucleotides in length, as hybridization probes. The nucleotide sequence of the human IGF-I exon suggests that IGF-I is synthesized as a larger precursor molecule.

Amino Acid Sequence↗
PubMed1984

The c-sis gene encodes a precursor of the B chain of platelet-derived growth factor.

The relationship between platelet-derived growth factor (PDGF) and the proto-oncogene c-sis has been determined by amino acid sequence analysis of PDGF and nucleotide sequence analysis of c-sis genomic clones. The nucleotide sequences of five regions of the human c-sis gene which are homologous to sequences of the transforming region (v-sis) of simian sarcoma virus (SSV) were determined. By alignment of the c-sis and v-sis nucleotide sequences the predicted amino acid sequence of a polypeptide homologous to the putative transforming protein p28sis of SSV was deduced. Both predicted sequences use the same termination codon and additional coding sequences may lie 5' to the homologous regions. Amino acid sequence analysis of the PDGF B chain shows identity to the amino acid sequence predicted from the c-sis sequences over 109 amino acid residues. Polymorphism may exist at two amino acid residues. These results suggest that c-sis encodes a polypeptide precursor of the B chain. A partial amino acid sequence of the PDGF A chain is also described. This chain is 60% homologous to the B chain and cannot be encoded by that part of c-sis which has been sequenced but could be encoded by sequences which lie 5' to the five regions of v-sis homology in c-sis, or at a separate locus.

Amino Acid Sequence↗
PubMed1984

Aboriginal marriage and survival.

Patterns of marriage among the aboriginal population of Australia are investigated. The author attempts to determine "the economic significance of a method of family formation in which child-bearing is an essential component of the process....[and discusses the impact of] change in the micro-economies of Aboriginal households and families." Probabilities of change in marital status are also considered. Data are from the 1981 census.

Australia↗
PubMed1984

Isolation of a cDNA clone coding for the gamma-subunit of mouse nerve growth factor using a high-stringency selection procedure.

A new approach was taken to isolate a full-length cDNA encoding the gamma-subunit of nerve growth factor (NGF). An oligonucleotide probe was used first to identify kallikrein-related sequences in a cDNA library derived from male mouse submaxillary gland mRNA. Of 10,000 clones, 860 were identified as being kallikrein-related; these were analyzed further by hybridization to synthetic oligonucleotides using a procedure which eliminates the effects of base composition and thus allows distinction between partial and perfect sequence complementarity. Nine clones hybridized with a gamma-subunit-specific probe at high stringency, and the nucleotide sequence of the longest cDNA insert was determined. Regions of homology and variability within the kallikrein gene family are maintained in this protein and probably reflect the similar functions and different substrates for this family of proteins.

Amino Acid Sequence↗