PubMed · 1145792
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E Jacobsen. 1975-03-17. [Primary hyperoxaluria type I].. https://pubmed.ncbi.nlm.nih.gov/1145792/
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Lysine decarboxylase (EC 4.1.1.18) was purified 364-fold from 2-day-old soybean (Glycine max) axes. The enzyme was a monomeric protein having a molecular mass of 95,000 Da and an isoelectric point of 4.0. The K(m) for L-lysine was 1.17 mM. The optimal temperature and pH of the enzyme were 37 degrees C and 7.5, respectively. Storage of the enzyme at temperature ranging from 0 to 4 degrees C caused a 50% loss of the activity in 24 h. The enzyme was competitively inhibited by Cl- with a Ki value of 1.46 mM. However, the activity of the purified enzyme was not inhibited by F-, Br-, I-, H2PO4-, HPO4(2-), or SO4(2-). Cadaverine at 1 mM inhibited the enzyme activity by 35%.
From July 1994 through November 1996, a phenotypically unique strain of Pseudomonas aeruginosa producing a pungent, "rotten-potato" odor and a positive lysine decarboxylase reaction was isolated from 39 patients at UCLA Medical Center (Los Angeles). Most cases (95%) were in intensive care units and had clinical infections (72%). Most isolates (74%) were recovered from cultures of respiratory secretions. To determine risk factors for acquisition of the organism, 23 cases were compared with 23 randomly selected controls matched by service and isolate date. Multivariate analysis revealed that isolation of malodorous P. aeruginosa was associated with mechanical ventilation of > 24 hours' duration (odds ratio [OR] = 9.4; P = .001) and transfer from an outside hospital (OR = 5.7; P = .04). DNA from outbreak strains hybridized to P. aeruginosa-specific toxin A and phospholipase C gene probes and all outbreak isolates tested were found to be identical by use of pulsed-field gel electrophoresis. An unusual phenotypic characteristic of the strain led to the recognition of a nosocomial outbreak of P. aeruginosa infection associated with mechanical ventilation.
Hydrogen sulfide production is used in conventional tests for identification and differentiation of Salmonella spp. from other species of Enterobacteriaceae, and a black precipitate on agar media is the indicator of the reaction. Selective liquid media were formulated for automated optical detection of H2S in salmonellae using the BioSys instrument. The media contained thiosulfate and ferric ammonium citrate, and production of H2S caused copious black pigmentation of the broth. Combination of the H2S indicators with dulcitol or xylose as fermentable carbohydrate, lysine, ornithine or arginine to induce decarboxylase activity, and Tergitol 4 as inhibitor selectively identified six Salmonella spp. by a sharp drop in transmittance at 585 nm. The time for detection of transmittance changes was inversely proportional to initial numbers of CFU in the media: 10 h for 10(5) CFU/ml and 17 h for 10(1) CFU/ml. No detection was observed in six non-Salmonella species of Enterobacteriaceae tested.