The Myristoylated Amino Terminus of ADP-ribosylation Factor 1 Is a Phospholipid- and GTP-sensitive Switch (*)
The Myristoylated Amino Terminus of ADP-ribosylation Factor 1 Is a Phospholipid- and GTP-sensitive Switch (*)
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ADP-核糖基化因子 1 的肉豆蔻酰化氨基末端是磷脂和 GTP 敏感开关 (*)
DOI:
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发表时间:
1995
影响因子:
4.8
通讯作者:
R. Kahn
中科院分区:
文献类型:
--
作者:
P. Randazzo;T. Terui;S. Sturch;H. Fales;A. Ferrige;R. Kahn
ADP-ribosylation factor 1 (Arf1) is an essential N-myristoylated 21-kDa GTP-binding protein with activities that include the regulation of membrane traffic and phospholipase D activity. Both the N terminus of the protein and the N-myristate bound to glycine 2 have previously been shown to be essential to the function of Arf in cells. We show that the bound nucleotide affects the conformation of either the N terminus or residues of Arf1 that are in direct contact with the N terminus. This was demonstrated by examining the effects of mutations in this N-terminal domain on guanosine 5′-O-(3-thio)triphosphate (GTPS) and GDP binding and dissociation kinetics. Arf1 mutants, lacking 13 or 17 residues from the N terminus or mutated at residues 3-7, had a greater affinity for GTPS and a lower affinity for GDP than did the wild-type protein. As the N terminus is required for interactions with target proteins, we conclude that the N terminus of Arf1 is a GTP-sensitive effector domain. When Arf1 was acylated, the GTP-dependent conformational changes were codependent on added phospholipids. In the absence of phospholipids, myristoylated Arf1 has a lower affinity for GTPS than for GDP, and in the presence of phospholipids, the myristoylated protein has a greater affinity for GTPS than for GDP. Thus, N-myristoylation is a critical component in the construction of this phospholipid- and GTP-dependent switch.
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DOI:
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发表时间:
1992
期刊:
The Journal of biological chemistry
影响因子:
--
作者:
Dizhoor,AM;Ericsson,LH;Johnson,RS;Kumar,S;Olshevskaya,E;Zozulya,S;Neubert,TA;Stryer,L;Hurley,JB;Walsh,KA
通讯作者:
Walsh,KA
DOI:
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发表时间:
1982
期刊:
The Journal of biological chemistry
影响因子:
--
作者:
Northup,JK;Smigel,MD;Gilman,AG
通讯作者:
Gilman,AG
DOI:
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发表时间:
1994
期刊:
The Journal of biological chemistry
影响因子:
--
作者:
Johnson,RS;Ohguro,H;Palczewski,K;Hurley,JB;Walsh,KA;Neubert,TA
通讯作者:
Neubert,TA
DOI:
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发表时间:
1994
期刊:
The Journal of biological chemistry
影响因子:
--
作者:
Lodge,JK;Johnson,RL;Weinberg,RA;Gordon,JI
通讯作者:
Gordon,JI
DOI:
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发表时间:
1993
期刊:
The Journal of biological chemistry
影响因子:
--
作者:
Rocque,WJ;McWherter,CA;Wood,DC;Gordon,JI
通讯作者:
Gordon,JI