The methionine salvage pathway in Bacillus subtilis.

The methionine salvage pathway in Bacillus subtilis.
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枯草芽孢杆菌中的蛋氨酸拯救途径。

DOI:
10.1186/1471-2180-2-8
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发表时间:
2002-04-25
期刊:
影响因子:
4.2
通讯作者:
Danchin, Antoine
Danchin, Antoine
中科院分区:
生物学3区
文献类型:
--
作者:
Sekowska, Agnieszka;Danchin, Antoine

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多胺合成产生甲硫腺苷,必须处理掉。细胞通过甲基硫代核糖(MTR)将其转化为甲硫氨酸。关于枯草芽孢杆菌中MTR回收蛋氨酸的情况知之甚少。在B中使用计算机基因组分析和转座子诱变。我们已经通过实验发现了双氧依赖性甲硫氨酸补救途径的主要步骤,尽管与肺炎克雷伯氏菌中发现的类似,但其实施招募了一些完全不同的蛋白质。通过引物延伸鉴定基因的启动子,并通过北方印迹和lacZ报告基因表达分析基因表达。在这一途径中最引人注目的发现是核酮糖二磷酸羧化酶(Rubisco,用于从大气中回收二氧化碳的卡尔文循环的植物酶)的类似物作为MTR再循环的主要步骤的作用。B中存在完整的蛋氨酸补救途径。枯草芽孢杆菌该途径在化学上类似于K. pneumoniae,但为此目的募集了不同的蛋白质。特别地,在途径中的一个步骤中使用过氧化物酶或Rubisco,MtnW。一个主要的观察结果是,在没有MtnW的情况下,MTR对细胞具有极强的毒性,为新的抗微生物药物开辟了一个意想不到的靶点。除了甲硫氨酸补救外,该途径还保护B。枯草芽孢杆菌对抗由其自然生境--叶片表面(叶面)产生的氧气。
Polyamine synthesis produces methylthioadenosine, which has to be disposed of. The cell recycles it into methionine through methylthioribose (MTR). Very little was known about MTR recycling for methionine salvage in Bacillus subtilis. Using in silico genome analysis and transposon mutagenesis in B. subtilis we have experimentally uncovered the major steps of the dioxygen-dependent methionine salvage pathway, which, although similar to that found in Klebsiella pneumoniae, recruited for its implementation some entirely different proteins. The promoters of the genes have been identified by primer extension, and gene expression was analyzed by Northern blotting and lacZ reporter gene expression. Among the most remarkable discoveries in this pathway is the role of an analog of ribulose diphosphate carboxylase (Rubisco, the plant enzyme used in the Calvin cycle which recovers carbon dioxide from the atmosphere) as a major step in MTR recycling. A complete methionine salvage pathway exists in B. subtilis. This pathway is chemically similar to that in K. pneumoniae, but recruited different proteins to this purpose. In particular, a paralogue or Rubisco, MtnW, is used at one of the steps in the pathway. A major observation is that in the absence of MtnW, MTR becomes extremely toxic to the cell, opening an unexpected target for new antimicrobial drugs. In addition to methionine salvage, this pathway protects B. subtilis against dioxygen produced by its natural biotope, the surface of leaves (phylloplane).
DOI: 10.1007/bf00383309
发表时间: 1985-01-01
期刊: MOLECULAR AND GENERAL GENETICS
影响因子: --
作者:
MURPHY, E
通讯作者: MURPHY, E
DOI: 10.1128/jb.157.3.718-726.1984
发表时间: 1984-01-01
影响因子: 3.2
作者:
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通讯作者: GUYER, MS
DOI: 10.1073/pnas.44.10.1072
发表时间: 1958-01-01
影响因子: 11.1
作者:
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DOI: 10.1046/j.1365-2958.1997.6542024.x
发表时间: 1997-12-01
影响因子: 3.6
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通讯作者: Hoch, JA
DOI: 10.1128/jb.177.9.2403-2407.1995
发表时间: 1995-05-01
影响因子: 3.2
作者:
KUNST, F;RAPOPORT, G
通讯作者: RAPOPORT, G