Abstract:
:Two nrdF genes, nrdF1 and nrdF2, encoding the small subunit (R2) of ribonucleotide reductase (RR) from Mycobacterium tuberculosis have 71% identity at the amino acid level and are both highly homologous with Salmonella typhimurium R2F. The calculated molecular masses of R2-1 and R2-2 are 36,588 (322 amino acids [aa]) and 36,957 (324 aa) Da, respectively. Western blot analysis of crude M. tuberculosis extracts indicates that both R2s are expressed in vivo. Recombinant R2-2 is enzymatically active when assayed with pure recombinant M. tuberculosis R1 subunit. Both ATP and dATP are activators for CDP reduction up to 2 and 1 mM, respectively. The gene encoding M. tuberculosis R2-1, nrdF1, is not linked to nrdF2, nor is either gene linked to the gene encoding the large subunit, M. tuberculosis nrdE. The gene encoding MTP64 was found downstream from nrdF1, and the gene encoding alcohol dehydrogenase was found downstream from nrdF2. A nrdA(Ts) strain of E. coli (E101) could be complemented by simultaneous transformation with M. tuberculosis nrdE and nrdF2. An M. tuberculosis nrdF2 variant in which the codon for the catalytically necessary tyrosine was replaced by the phenylalanine codon did not complement E101 when cotransformed with M. tuberculosis nrdE. Similarly, M. tuberculosis nrdF1 and nrdE did not complement E101. Activity of recombinant M. tuberculosis RR was inhibited by incubating the enzyme with a peptide corresponding to the 7 C-terminal amino acid residues of the R2-2 subunit. M. tuberculosis is a species in which a nrdEF system appears to encode the biologically active species of RR and also the only bacterial species identified so far in which class I RR subunits are not arranged on an operon.
journal_name
J Bacterioljournal_title
Journal of bacteriologyauthors
Yang F,Curran SC,Li LS,Avarbock D,Graf JD,Chua MM,Lu G,Salem J,Rubin Hdoi
10.1128/jb.179.20.6408-6415.1997subject
Has Abstractpub_date
1997-10-01 00:00:00pages
6408-15issue
20eissn
0021-9193issn
1098-5530journal_volume
179pub_type
杂志文章abstract::Cytochrome c' (Cyt c') is a c-type cytochrome with a pentacoordinate heme iron. The gene encoding this protein in Rhodobacter sphaeroides 2.4.3, designated cycP, was isolated and sequenced. Northern blot analysis and beta-galactosidase assays demonstrated that cycP transcription increased as oxygen levels decreased an...
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abstract::Previous investigations have demonstrated the existence of five Histoplasma capsulatum serotypes. Available specific fluorescent-antibody reagents stain only four of the five serotypes. Antibodies produced against the most complete H. capsulatum serotype were labeled with fluorescein isothiocyanate to develop a reagen...
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journal_title:Journal of bacteriology
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journal_title:Journal of bacteriology
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journal_title:Journal of bacteriology
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更新日期:2001-12-01 00:00:00
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journal_title:Journal of bacteriology
pub_type: 杂志文章
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更新日期:1997-08-01 00:00:00
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pub_type: 杂志文章,收录出版
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更新日期:2004-04-01 00:00:00
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journal_title:Journal of bacteriology
pub_type: 杂志文章
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journal_title:Journal of bacteriology
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journal_title:Journal of bacteriology
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更新日期:1968-03-01 00:00:00
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journal_title:Journal of bacteriology
pub_type: 杂志文章
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更新日期:1967-02-01 00:00:00
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journal_title:Journal of bacteriology
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更新日期:1997-11-01 00:00:00
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journal_title:Journal of bacteriology
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