F-actin homeostasis through transcriptional regulation and proteasome-mediated proteolysis.
F-actin homeostasis through transcriptional regulation and proteasome-mediated proteolysis.
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F-肌动蛋白通过转录调节和蛋白酶体介导的蛋白水解实现稳态。
DOI:
10.1073/pnas.1721935115
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发表时间:
2018
影响因子:
11.1
通讯作者:
Cross,FrederickR
中科院分区:
文献类型:
--
作者:
Onishi,Masayuki;Pecani,Kresti;Jones4th,Taylor;Pringle,JohnR;Cross,FrederickR
Many organisms possess multiple and often divergent actins whose regulation and roles are not understood in detail. For example,Chlamydomonas reinhardtiihas both a conventional actin (IDA5) and a highly divergent one (NAP1); only IDA5 is expressed in normal proliferating cells. We showed previously that the drug latrunculin B (LatB) causes loss of filamentous (F-) IDA5 and strong up-regulation of NAP1, which then provides essential actin function(s) by forming LatB-resistant F-NAP1. RNA-sequencing analyses now show that this up-regulation of NAP1 reflects a broad transcriptional response, much of which depends on three proteins (LAT1, LAT2, and LAT3) identified previously as essential forNAP1transcription. Many of the LAT-regulated genes contain a putativecis-acting regulatory site, the “LRE motif.” The LatB transcriptional program appears to be activated by loss of F-IDA5 and deactivated by formation of F-NAP1, thus forming an F-actin–dependent negative-feedback loop. Multiple genes encoding proteins of the ubiquitin-proteasome system are among those induced by LatB, resulting in rapid degradation of IDA5 (but not NAP1). Our results suggest that IDA5 degradation is functionally important because nonpolymerizable LatB-bound IDA5 interferes with the formation of F-NAP1. The genes for the actin-interacting proteins cofilin and profilin are also induced. Cofilin induction may further the clearance of IDA5 by promoting the scission of F-IDA5, whereas profilin appears to function in protecting monomeric IDA5 from degradation. This multifaceted regulatory system allows rapid and quantitative turnover of F-actin in response to cytoskeletal perturbations and probably also maintains F-actin homeostasis under normal growth conditions.
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DOI:
--
发表时间:
1990
期刊:
影响因子:
--
作者:
D. Ouimette;M. Coffey
通讯作者:
M. Coffey
影响因子:
1.4
作者:
B. Shearer;R. Fairman
通讯作者:
R. Fairman
影响因子:
4.3
作者:
M. Carswell;Bruce R. Grant;W. Plaxton
通讯作者:
W. Plaxton
DOI:
10.1073/pnas.0500778102
发表时间:
2005-05-24
影响因子:
11.1
作者:
Miura, K;Rus, A;Hasegawa, PM
通讯作者:
Hasegawa, PM
影响因子:
3
作者:
Sophie K Walker;Kenny Chitcholtan;Yuping Yu;Gabrielle M. Christenhusz;A. Garrill
通讯作者:
A. Garrill