Impact of N-terminal Myristoylation on the Ca2+-dependent Conformational Transition in Recoverin*
Impact of N-terminal Myristoylation on the Ca2+-dependent Conformational Transition in Recoverin*
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N 末端肉豆蔻酰化对 Recoverin* 中 Ca2 依赖性构象转变的影响
DOI:
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发表时间:
2003
影响因子:
4.8
通讯作者:
K. Koch
中科院分区:
文献类型:
--
作者:
O. Weiergräber;I. I. Senin;P. P. Philippov;J. Granzin;K. Koch
Recoverin is a Ca2+-regulated signal transduction modulator found in vertebrate retina that has been shown to undergo dramatic conformational changes upon Ca2+ binding to its two functional EF-hand motifs. To elucidate the differential impact of the N-terminal myristoylation as well as occupation of the two Ca2+ binding sites on recoverin structure and function, we have investigated a non-myristoylated E85Q mutant exhibiting virtually no Ca2+ binding to EF-2. Crystal structures of the mutant protein as well as the non-myristoylated wild-type have been determined. Although the non-myristoylated E85Q mutant does not display any functional activity, its three-dimensional structure in the presence of Ca2+ resembles the myristoylated wild-type with two Ca2+ but is quite dissimilar from the myristoylated E85Q mutant. We conclude that the N-terminal myristoyl modification significantly stabilizes the conformation of the Ca2+-free protein (i.e. the T conformation) during the stepwise transition toward the fully Ca2+-occupied state. On the basis of these observations, a refined model for the role of the myristoyl group as an intrinsic allosteric modulator is proposed.
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DOI:
--
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
影响因子:
6.8
作者:
Ames, JB;Tanaka, T;Ikura, M
通讯作者:
Ikura, M
DOI:
10.1146/annurev.bb.16.060187.001135
发表时间:
1987
期刊:
Annual review of biophysics and biophysical chemistry
影响因子:
--
作者:
Srivastava,DK;Bernhard,SA
通讯作者:
Bernhard,SA
影响因子:
2.9
作者:
Ames, JB;Hendricks, KB;Thorner, J
通讯作者:
Thorner, J
影响因子:
2.9
作者:
Hughes,RE;Brzovic,PS;Klevit,RE;Hurley,JB
通讯作者:
Hurley,JB