Abstract:
:The well-known large catabolic potential of rhodococci is greatly facilitated by an impressive gene multiplicity. This study reports on the multiplicity of kshA, encoding the oxygenase component of 3-ketosteroid 9α-hydroxylase, a key enzyme in steroid catabolism. Five kshA homologues (kshA1 to kshA5) were previously identified in Rhodococcus rhodochrous DSM43269. These KshA(DSM43269) homologues are distributed over several phylogenetic groups. The involvement of these KshA homologues in the catabolism of different classes of steroids, i.e., sterols, pregnanes, androstenes, and bile acids, was investigated. Enzyme activity assays showed that all KSH enzymes with KshA(DSM43269) homologues are C-9 α-hydroxylases acting on a wide range of 3-ketosteroids, but not on 3-hydroxysteroids. KshA5 appeared to be the most versatile enzyme, with the broadest substrate range but without a clear substrate preference. In contrast, KshA1 was found to be dedicated to cholic acid catabolism. Transcriptional analysis and functional complementation studies revealed that kshA5 supported growth on any of the different classes of steroids tested, consistent with its broad expression induction pattern. The presence of multiple kshA genes in the R. rhodochrous DSM43269 genome, each displaying unique steroid induction patterns and substrate ranges, appears to facilitate a dynamic and fine-tuned steroid catabolism, with C-9 α-hydroxylation occurring at different levels during microbial steroid degradation.
journal_name
J Bacterioljournal_title
Journal of bacteriologyauthors
Petrusma M,Hessels G,Dijkhuizen L,van der Geize Rdoi
10.1128/JB.00274-11subject
Has Abstractpub_date
2011-08-01 00:00:00pages
3931-40issue
15eissn
0021-9193issn
1098-5530pii
JB.00274-11journal_volume
193pub_type
杂志文章abstract::Genetic transformation of auxotrophs of the extreme thermophile Thermus thermophilus HB27 to prototrophy was obtained at high frequencies of 10(-2) to 10(-1) when proliferating cell populations were exposed to chromosomal DNA from a nutritionally independent wild-type strain. The transformation frequency was proportio...
journal_title:Journal of bacteriology
pub_type: 杂志文章
doi:10.1128/jb.166.1.338-340.1986
更新日期:1986-04-01 00:00:00
abstract::The nonstarter lactic acid bacterium Lactococcus raffinolactis is prevalent in a wide range of environments, such as the dairy environment, but little is known about this species. Here, we present the draft genome of Lactococcus raffinolactis strain 4877, isolated from a natural mesophilic dairy starter culture. ...
journal_title:Journal of bacteriology
pub_type: 杂志文章
doi:10.1128/JB.01697-12
更新日期:2012-11-01 00:00:00
abstract::Welker, N. E. (Western Reserve University, Cleveland, Ohio), and L. Leon Campbell. Preferential synthesis of alpha-amylase by Bacillus stearothermophilus in the presence of 5-methyl-tryptophan. J. Bacteriol. 87:828-831. 1964.-Washed-cell suspensions of Bacillus stearothermophilus induced with pure maltose preferential...
journal_title:Journal of bacteriology
pub_type: 杂志文章
doi:10.1128/JB.87.4.828-831.1964
更新日期:1964-04-01 00:00:00
abstract::Twelve strains of Agrobacterium radiobacter isolated from naturally occurring crown galls or soil were found to be avirulent on sunflower, tomato, Kalanchoe, and carrot. Eleven strains contained plasmids of molecular weights 77 X 10(6) to 182 X 10(6) as determined by electron microscopy. One strain contained only a sm...
journal_title:Journal of bacteriology
pub_type: 杂志文章
doi:10.1128/JB.129.1.76-80.1977
更新日期:1977-01-01 00:00:00
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journal_title:Journal of bacteriology
pub_type: 杂志文章
doi:10.1128/jb.165.1.334-335.1986
更新日期:1986-01-01 00:00:00
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journal_title:Journal of bacteriology
pub_type: 杂志文章
doi:10.1128/JB.105.2.595-603.1971
更新日期:1971-02-01 00:00:00
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pub_type: 杂志文章
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更新日期:2002-07-01 00:00:00
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journal_title:Journal of bacteriology
pub_type: 杂志文章
doi:10.1128/jb.177.23.7007-7009.1995
更新日期:1995-12-01 00:00:00
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journal_title:Journal of bacteriology
pub_type: 杂志文章
doi:10.1128/jb.176.8.2200-2209.1994
更新日期:1994-04-01 00:00:00
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journal_title:Journal of bacteriology
pub_type: 杂志文章
doi:10.1128/jb.185.22.6728-6731.2003
更新日期:2003-11-01 00:00:00
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journal_title:Journal of bacteriology
pub_type: 杂志文章
doi:10.1128/jb.171.1.593-595.1989
更新日期:1989-01-01 00:00:00
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pub_type: 杂志文章
doi:10.1128/JB.133.3.1181-1189.1978
更新日期:1978-03-01 00:00:00
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journal_title:Journal of bacteriology
pub_type: 杂志文章
doi:10.1128/jb.176.10.2999-3006.1994
更新日期:1994-05-01 00:00:00
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journal_title:Journal of bacteriology
pub_type: 杂志文章
doi:10.1128/JB.108.1.564-570.1971
更新日期:1971-10-01 00:00:00
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journal_title:Journal of bacteriology
pub_type: 杂志文章
doi:10.1128/JB.123.2.443-448.1975
更新日期:1975-08-01 00:00:00
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journal_title:Journal of bacteriology
pub_type: 杂志文章
doi:10.1128/jb.182.6.1731-1738.2000
更新日期:2000-03-01 00:00:00
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journal_title:Journal of bacteriology
pub_type: 杂志文章
doi:10.1128/jb.184.9.2543-2545.2002
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journal_title:Journal of bacteriology
pub_type: 杂志文章
doi:10.1128/JB.156.1.109-114.1983
更新日期:1983-10-01 00:00:00
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journal_title:Journal of bacteriology
pub_type: 杂志文章
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pub_type: 杂志文章
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更新日期:2011-01-01 00:00:00
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journal_title:Journal of bacteriology
pub_type: 杂志文章
doi:10.1128/jb.173.7.2196-2205.1991
更新日期:1991-04-01 00:00:00
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journal_title:Journal of bacteriology
pub_type: 杂志文章
doi:10.1128/jb.167.2.455-461.1986
更新日期:1986-08-01 00:00:00
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journal_title:Journal of bacteriology
pub_type: 杂志文章
doi:10.1128/jb.178.3.683-690.1996
更新日期:1996-02-01 00:00:00
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journal_title:Journal of bacteriology
pub_type: 杂志文章
doi:10.1128/JB.117.3.1358-1360.1974
更新日期:1974-03-01 00:00:00
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journal_title:Journal of bacteriology
pub_type: 杂志文章
doi:10.1128/JB.121.1.197-203.1975
更新日期:1975-01-01 00:00:00
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journal_title:Journal of bacteriology
pub_type: 杂志文章
doi:10.1128/JB.150.2.535-544.1982
更新日期:1982-05-01 00:00:00
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journal_title:Journal of bacteriology
pub_type: 杂志文章
doi:10.1128/JB.01593-07
更新日期:2008-02-01 00:00:00
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journal_title:Journal of bacteriology
pub_type: 杂志文章
doi:10.1128/jb.173.8.2681-2690.1991
更新日期:1991-04-01 00:00:00
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journal_title:Journal of bacteriology
pub_type: 杂志文章
doi:10.1128/JB.99.1.25-36.1969
更新日期:1969-07-01 00:00:00
abstract::Surface protein antigens of Mycoplasma hyopneumoniae were identified by direct antibody-surface binding or by radioimmunoprecipitation of surface 125I-labeled proteins with a series of monoclonal antibodies (MAbs). Surface proteins p70, p65, p50, and p44 were shown to be integral membrane components by selective parti...
journal_title:Journal of bacteriology
pub_type: 杂志文章
doi:10.1128/jb.169.12.5546-5555.1987
更新日期:1987-12-01 00:00:00