PARTIAL LOSS OF FUNCTION MUTATIONS IN DNAK, THE ESCHERICHIA-COLI HOMOLOG OF THE 70-KDA HEAT-SHOCK PROTEINS, AFFECT HIGHLY CONSERVED AMINO-ACIDS IMPLICATED IN ATP BINDING AND HYDROLYSIS

被引:53
作者
WILD, J
KAMATHLOEB, A
ZIEGELHOFFER, E
LONETTO, M
KAWASAKI, Y
GROSS, CA
机构
[1] UNIV WISCONSIN,DEPT BACTERIOL,MADISON,WI 53706
[2] KYOTO UNIV,INST VIRUS RES,KYOTO 606,JAPAN
关键词
DOMINANT NEGATIVE MUTANTS; HEAT SHOCK RESPONSE; ATPASE;
D O I
10.1073/pnas.89.15.7139
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
A set of 37 mutations in DnaK, the Escherichia coli homologue of the 70-kDa heat shock proteins, was isolated using a selection for high constitutive expression of heat shock proteins. Of these, 11 mutants were able to carry out some but not all functions of DnaK. These partial function mutants were divided into two classes. Class I mutants are recessive and permit replication of bacteriophage-lambda and growth of cells up to 40-degrees-C. Class II mutants are dominant, do not permit growth of lambda, and are temperature-sensitive for growth above 34-degrees-C. Mutations in both classes alter amino acids that are highly conserved in the 70-kDa heat shock protein family. The dominant negative mutations provide strong genetic evidence that at least one form of DnaK is multimeric. Moreover, every dominant negative mutation occurs at an amino acid that has been hypothesized to be intimately involved in the process of ATP binding and hydrolysis. Our findings provide strong support for the hypothesis that such mutations are excellent tools for identifying amino acids that play critical roles in protein function.
引用
收藏
页码:7139 / 7143
页数:5
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