Localization of the tightly bound divalent-cation-dependent and nucleotide-dependent conformation changes in G-actin using limited proteolytic digestion.
Localization of the tightly bound divalent-cation-dependent and nucleotide-dependent conformation changes in G-actin using limited proteolytic digestion.
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使用有限的蛋白水解消化来定位 G 肌动蛋白中紧密结合的二价阳离子依赖性和核苷酸依赖性构象变化。
DOI:
10.1111/j.1432-1033.1993.tb17603.x
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发表时间:
1993
期刊:
影响因子:
--
通讯作者:
Małgorzata Mossakowska
中科院分区:
文献类型:
--
作者:
H. Strzelecka;Joanna Moraczewska;Sofia Khaitlina;Małgorzata Mossakowska
Using proteolytic susceptibility as a probe, we have identified four regions of the actin polypeptide chain where structural rearrangements, dependent on the nature of the tightly bound metal ion and/or nucleotide, take place. Replacement of the tightly bound Ca2+ by Mg2+ in ATP-actin strongly affected the regions around Arg26 and Lys68, as judged from nearly complete inhibition of tryptic cleavages of the polypeptide chain at these residues. It also significantly diminished the rates of splitting by trypsin of the peptide bonds involving carbonyl groups of Arg372 and of Lys373 in the C-terminal segment. Conversion of ATP-actin to ADP-actin (with Mg2+ as the tightly bound cation) abolished the protective effect of Mg2+ on specific tryptic cleavage and, in contrast, largely inhibited proteolysis at specific sites for subtilisin and for a novel protease from Escherichia coli A2 strain within a surface loop of residues 39-51. We also examined the effect of proteolytic cleavage or chemical modification at certain sites on the kinetics of proteolysis at other sites of the molecule. These experiments demonstrated structural relationships between loop 39-51 and regions involving Lys61 and Lys68. It is suggested that the conformational transitions reflected in the observed changes in proteolytic susceptibility may underlie the known influence of the nature of the tightly bound cation and nucleotide on the kinetics of actin polymerization and stability of the polymer.
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影响因子:
3.9
作者:
Waring,AJ;Cooke,R
通讯作者:
Cooke,R
影响因子:
2.9
作者:
Konno,K
通讯作者:
Konno,K
DOI:
--
发表时间:
1987
期刊:
The Journal of biological chemistry
影响因子:
--
作者:
Estes,JE;Selden,LA;Gershman,LC
通讯作者:
Gershman,LC
影响因子:
2.9
作者:
Frieden,C;Patane,K
通讯作者:
Patane,K
DOI:
--
发表时间:
1986
期刊:
The Journal of biological chemistry
影响因子:
--
作者:
Goddette,DW;Uberbacher,EC;Bunick,GJ;Frieden,C
通讯作者:
Frieden,C