Functional Analysis of a Divergent System II Protein, Ccs1, Involved in c-Type Cytochrome Biogenesis* 210

Functional Analysis of a Divergent System II Protein, Ccs1, Involved in c-Type Cytochrome Biogenesis* 210
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参与 c 型细胞色素生物发生的发散系统 II 蛋白 Ccs1 的功能分析* 210

DOI:
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发表时间:
2003
影响因子:
4.8
通讯作者:
S. Merchant
S. Merchant
中科院分区:
生物学2区
文献类型:
--
作者:
B. W. Dreyfuss;P. Hamel;S. S. Nakamoto;S. Merchant

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Ccs 1基因是由莱茵衣藻Ccs 1基因座编码的,它编码系统II型C型细胞色素生物合成途径的一个高度分化的新组分。利用phoA和lacZα细菌拓扑报告基因推导了集胞藻6803 Ccs 1同源基因CcsB的拓扑模型。CcsB和Ccs 1在其C末端具有一个大的可溶性内腔结构域,该结构域通过蛋白质N末端部分的三个紧密间隔的跨膜结构域束缚在类囊体膜中。ccs 1等位基因的分子分析表明,整个C-末端的可溶性结构域是必不可少的Ccs 1功能和基质环似乎是重要的,在体内,至少为维护Ccs 1。定点突变分析表明,一个单一的组氨酸(His 274)内的最后一个跨膜结构域,前面的大内腔结构域,是必需的C型细胞色素组装,而不变的半胱氨酸残基(Cys 199)被证明是非必需的。Ccs 1被认为与其他Ccs组分相互作用,这是基于其在ccs 2、ccs 3、ccs 4和ccsA菌株中的累积减少。
The Ccs1 gene, encoding a highly divergent novel component of a system II type c-type cytochrome biogenesis pathway, is encoded by the previously definedCCS1 locus in Chlamydomonas reinhardtii. phoA and lacZα bacterial topological reporters were used to deduce a topological model of theSynechocystis sp. 6803 Ccs1 homologue, CcsB. CcsB, and therefore by analogy Ccs1, possesses a large soluble lumenal domain at its C terminus that is tethered in the thylakoid membrane by three closely spaced transmembrane domains in the N-terminal portion of the protein. Molecular analysis of ccs1 alleles reveals that the entire C-terminal soluble domain is essential for Ccs1 function and that a stromal loop appears to be important in vivo, at least for maintenance of Ccs1. Site-directed mutational analysis reveals that a single histidine (His274) within the last transmembrane domain, preceding the large lumenal domain, is required for c-type cytochrome assembly, whereas an invariant cysteine residue (Cys199) is shown to be non-essential. Ccs1 is proposed to interact with other Ccs components based on its reduced accumulation in ccs2,ccs3, ccs4, and ccsAstrains.
DOI: 10.1016/s0021-9258(19)84657-4
发表时间: 1989-10
期刊: The Journal of biological chemistry
影响因子: --
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DOI: 10.1006/jmbi.1997.1227
发表时间: 1997-09-05
影响因子: 5.6
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