Temperature-sensitive variants of Saccharomyces cerevisiae iso-1-cytochrome c produced by random mutagenesis of codons 43 to 54.

Temperature-sensitive variants of Saccharomyces cerevisiae iso-1-cytochrome c produced by random mutagenesis of codons 43 to 54.
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通过密码子 43 至 54 的随机诱变产生的酿酒酵母 iso-1-细胞色素 c 的温度敏感变体。

DOI:
10.1016/0022-2836(91)80207-b
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发表时间:
1991
影响因子:
5.6
通讯作者:
Pielak,GJ
Pielak,GJ
中科院分区:
生物学2区
文献类型:
--
作者:
Wang,XH;Pielak,GJ

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参考文献

被引文献

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在体外随机诱变中,来自酿酒酵母的Cyc1基因被用来产生一个包含iso-1-细胞色素c密码子43到54的突变体文库。该区域由一个进化多样性序列中的进化保守结构组成。该文库位于一个低拷贝数的酵母穿梭噬菌体上,被引入到一个缺乏细胞色素的酵母菌株中。利用含有功能性细胞色素的转化子在30℃和37℃的非发酵碳源甘油上生长的能力来确定近1000个转化子的表型。文库中约90%的错义突变体产生野生型表型,7%产生温度敏感型(Cycts)表型,3%产生非功能性(Cyc−)表型。对20个Cyc和30个Cyc−转化子的噬菌体进行了序列分析。所有的突变都发生在目标区域内。Cyc−转化子的1/3突变体和Cyct转化子的所有突变体都是错义突变体。来自Cyc−转化子的其余突变体为无义或移码突变体。仅Gly45、Tyr46、Thr49、Asn52或Ile53密码子内的错义突变就足以在变异蛋白质中产生温度敏感行为。推导出的氨基酸替换与野生型蛋白质的侧链动力学、二级结构和三级结构有很好的相关性。
In vitrorandom mutagenesis within theCYC1gene from the yeastSaccharomyces cerevisiaewas used to produce a library of mutants encompassing codons 43 to 54 of iso-1-cytochromec. This region consists of an evolutionarily conserved structure within an evolutionarily diverse sequence. The library, on a low-copy-number yeast shuttle phagemid, was introduced into a yeast strain lacking cytochromec. The ability of transformants harboring a functional cytochromecto grow on the non-fermentable carbon source glycerol at 30°C and 37°C was used to determine the phenotype of nearly 1000 transformants. Approximately 90% of the missense mutants present in the library give rise to the wild-type phenotype, 7% result in the temperature-sensitive (Cycts) phenotype, and 3% give rise to the non-functional (Cyc−) phenotype. Phagemids from 20 Cyctsand 30 Cyc−transformants were subjected to DNA sequence analysis. All the mutations occur within the targeted region. One-third of the mutants from Cyc−transformants and all the mutants from Cyctstransformants are missense mutants. The remaining mutants from Cyc−transformants are nonsense or frame-shift mutants. Missense mutations within the codons for Gly45, Tyr46, Thr49, Asn52 or Ile53 alone are sufficient to produce temperature-sensitive behavior bothin vivoand in the variant proteins. The deduced amino acid substitutions correlate remarkably well with side-chain dynamics, secondary structure and tertiary structure of the wild-type protein.
从线粒体细胞色素 c 中切除 omega 环(残基 40-55)的功能后果。
DOI: --
发表时间: 1987
影响因子: 4.8
作者:
C. Wallace
通讯作者: C. Wallace
DOI: --
发表时间: 1981
影响因子: 5.6
作者:
T. Takano;R. Dickerson
通讯作者: R. Dickerson
质子核磁共振研究表明,酵母iso-1-细胞色素c的Thr-102突变体是真核细胞色素c家族的典型成员。
DOI: --
发表时间: 1988
期刊: European Journal of Biochemistry
影响因子: --
作者:
G. Pielak;J. Boyd;G. Moore;R. J. Williams
通讯作者: R. J. Williams
酵母细胞色素c基因的鉴定和分离
DOI: --
发表时间: 1978
期刊: Cell
影响因子: 64.5
作者:
D. Montgomery;B. Hall;S. Gillam;Michael B. Smith
通讯作者: Michael B. Smith
使用质子顺磁位移比较还原和氧化的酵母 iso-1-细胞色素 c。
DOI: --
发表时间: 1991
期刊: Biochemistry
影响因子: 2.9
作者:
Y. Gao;J. Boyd;G. Pielak;R. J. Williams
通讯作者: R. J. Williams