Rab3a Binding and Secretion-enhancing Domains in Rim1 Are Separate and Unique
Rab3a Binding and Secretion-enhancing Domains in Rim1 Are Separate and Unique
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Rim1 中的 Rab3a 结合域和分泌增强域是独立且独特的
DOI:
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发表时间:
2001
影响因子:
4.8
通讯作者:
R. Holz
中科院分区:
文献类型:
--
作者:
Lei Sun;M. A. Bittner;R. Holz
Rim1 was identified in brain by its ability to bind Rab3a-GTP and has been postulated to be a Rab3a effector protein. Like Rabphilin3, it modulates secretion and contains a zinc finger and two C2 domains. We have investigated the structural basis for the ability of Rim1 to bind Rab3a-GTP and to stimulate exocytosis in chromaffin cells. Both full-length and N-terminal Rim1 enhance secretion 40–50% in both intact and permeabilized cells. The abilities of Rim1 to enhance secretion and to bind Rab3a-GTP reside on distinct and relatively small domains that act independently. A ∼30-amino acid sequence immediately N-terminal of the zinc finger constitutes the minimal Rab3a-GTP binding domain. This short sequence is not found in Rabphilin3 and is entirely different from the zinc finger and flanking regions of Rabphilin3 that bind Rab3a-GTP. The zinc finger domain in Rim1 is unnecessary for Rab3a-GTP binding but, alone, enhances secretion. An analysis of the characteristics of the enhancement of secretion in permeabilized chromaffin cells indicates that N-terminal Rim1 does not alter the sensitivity of secretion to Ca2+ but, instead, increases the rate of ATP-dependent priming of secretion.
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DOI:
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发表时间:
1994
期刊:
The Journal of biological chemistry
影响因子:
--
作者:
Holz,RW;Brondyk,WH;Senter,RA;Kuizon,L;Macara,IG
通讯作者:
Macara,IG
DOI:
--
发表时间:
1994
期刊:
The Journal of biological chemistry
影响因子:
--
作者:
FischervonMollard,G;Stahl,B;Khokhlatchev,A;Südhof,TC;Jahn,R
通讯作者:
Jahn,R
DOI:
--
发表时间:
1993
期刊:
The Journal of biological chemistry
影响因子:
--
作者:
Wick,PF;Senter,RA;Parsels,LA;Uhler,MD;Holz,RW
通讯作者:
Holz,RW
影响因子:
4
作者:
Darchen,F;Senyshyn,J;Brondyk,WH;Taatjes,DJ;Holz,RW;Henry,JP;Denizot,JP;Macara,IG
通讯作者:
Macara,IG
DOI:
--
发表时间:
1989
期刊:
The Journal of biological chemistry
影响因子:
--
作者:
Holz,RW;Bittner,MA;Peppers,SC;Senter,RA;Eberhard,DA
通讯作者:
Eberhard,DA