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• W2034149893 abstract "ABSTRACT Azotobacter vinelandii produces two detectable catalases during growth on minimal medium. The heat-labile catalase expressed during exponential growth phase was identified as a KatG homologue by liquid chromatography-tandem mass spectrometry (LC-MS/MS) using a mixed protein sample. The second catalase was heat resistant and had substantial residual activity after treatment at 90°C. This enzyme was purified by anion-exchange and size exclusion chromatography and was found to exhibit strong absorption at 407 nm, which is often indicative of associated heme moieties. The purified protein was fragmented by proteinase K and identified by LC-MS/MS. Some identity was shared with the MauG/bacterial cytochrome c peroxidase (BCCP) protein family, but the enzyme exhibited a strong catalase activity never before observed in this family. Because two putative c -type heme sites (CXXCH) were predicted in the peptide sequence and were demonstrated experimentally, the enzyme was designated a cytochrome c catalase (CCC Av ). However, the local organization of the CCC Av heme motifs differed significantly from that of the BCCPs as the sites were confined to the C-terminal half of the catalase. A possible Ca 2+ binding motif, previously described in the BCCPs, is also present in the CCC Av peptide sequence. Some instability in the presence of EGTA was observed. Expression of the catalase was abolished in cccA mutants, resulting in a nearly 8,700-fold reduction in peroxide resistance in stationary phase." @default.
• W2034149893 created "2016-06-24" @default.
• W2034149893 creator A5001332515 @default.
• W2034149893 creator A5085952544 @default.
• W2034149893 date "2008-02-01" @default.
• W2034149893 modified "2023-09-23" @default.
• W2034149893 title "Identification of Two Catalases in Azotobacter vinelandii : a KatG Homologue and a Novel Bacterial Cytochrome c Catalase, CCC Av" @default.
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• W2034149893 doi "https://doi.org/10.1128/jb.01572-06" @default.
• W2034149893 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/2223588" @default.
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• W2034149893 hasPublicationYear "2008" @default.
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