The third P-loop domain in cytoplasmic dynein heavy chain is essential for dynein motor function and ATP-sensitive microtubule binding.
The third P-loop domain in cytoplasmic dynein heavy chain is essential for dynein motor function and ATP-sensitive microtubule binding.
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细胞质动力蛋白重链中的第三个 P 环结构域对于动力蛋白运动功能和 ATP 敏感的微管结合至关重要。
DOI:
10.1091/mbc.e02-10-0675
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发表时间:
2003
影响因子:
3.3
通讯作者:
Hays,ThomasS
中科院分区:
文献类型:
--
作者:
Silvanovich,Andre;Li,Min-Gang;Serr,Madeline;Mische,Sarah;Hays,ThomasS
Sequence comparisons and structural analyses show that the dynein heavy chain motor subunit is related to the AAA family of chaperone-like ATPases. The core structure of the dynein motor unit derives from the assembly of six AAA domains into a hexameric ring. In dynein, the first four AAA domains contain consensus nucleotide triphosphate-binding motifs, or P-loops. The recent structural models of dynein heavy chain have fostered the hypothesis that the energy derived from hydrolysis at P-loop 1 acts through adjacent P-loop domains to effect changes in the attachment state of the microtubule-binding domain. However, to date, the functional significance of the P-loop domains adjacent to the ATP hydrolytic site has not been demonstrated. Our results provide a mutational analysis of P-loop function within the first and third AAA domains of theDrosophilacytoplasmic dynein heavy chain. Here we report the first evidence that P-loop-3 function is essential for dynein function. Significantly, our results further show that P-loop-3 function is required for the ATP-induced release of the dynein complex from microtubules. Mutation of P-loop-3 blocks ATP-mediated release of dynein from microtubules, but does not appear to block ATP binding and hydrolysis at P-loop 1. Combined with the recent recognition that dynein belongs to the family of AAA ATPases, the observations support current models in which the multiple AAA domains of the dynein heavy chain interact to support the translocation of the dynein motor down the microtubule lattice.
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影响因子:
5.6
作者:
X. Yu;S. C. West;E. Egelman
通讯作者:
X. Yu;S. C. West;E. Egelman
影响因子:
7
作者:
A. F. Neuwald;L. Aravind;J. Spouge;E. Koonin
通讯作者:
A. F. Neuwald;L. Aravind;J. Spouge;E. Koonin
DOI:
10.1006/jmbi.1997.1584
发表时间:
1998
期刊:
Journal of molecular biology.
影响因子:
--
作者:
Samso,M;Radermacher,M;Frank,J;Koonce,MP
通讯作者:
Koonce,MP
影响因子:
64.8
作者:
STORY, RM;STEITZ, TA
通讯作者:
STEITZ, TA
影响因子:
--
作者:
Gibbons,IR;Mocz,G
通讯作者:
Mocz,G