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
K. Koch
中科院分区:
生物学2区
文献类型:
--
作者:
O. Weiergräber;I. I. Senin;P. P. Philippov;J. Granzin;K. Koch

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Recovery蛋白是一种存在于脊椎动物视网膜中的钙离子调节的信号转导调节剂,在钙离子与其两个功能性EF-手型基序结合后,其构象发生显著变化。为了阐明恢复素结构和功能的N-末端豆蔻酰化以及两个Ca 2+结合位点的占据的差异影响,我们研究了非豆蔻酰化的E85 Q突变体,其表现出几乎没有Ca 2+与EF-2结合。突变蛋白质以及非豆蔻酰化的野生型的晶体结构已被确定。虽然非豆蔻酰化E85 Q突变体不显示任何功能活性,但其在Ca 2+存在下的三维结构类似于具有两个Ca 2+的豆蔻酰化野生型,但与豆蔻酰化E85 Q突变体非常不同。我们的结论是,N-末端肉豆蔻酰修饰显着稳定的无钙蛋白质(即T构象)的构象在逐步过渡到完全Ca 2+占据的状态。在这些观察的基础上,提出了肉豆蔻酰基作为内在变构调节剂的作用的精确模型。
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.
视网膜恢复素的 NH2 末端被一小类脂肪酸酰化。
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
DOI: 10.1016/s0959-440x(96)80106-0
发表时间: 1996-08-01
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
DOI: 10.1021/bi0012890
发表时间: 2000-10-10
期刊: BIOCHEMISTRY
影响因子: 2.9
作者:
Ames, JB;Hendricks, KB;Thorner, J
通讯作者: Thorner, J
恢复素肉豆蔻酰基的钙依赖性溶剂化。
DOI: 10.1021/bi00036a013
发表时间: 1995
期刊: Biochemistry
影响因子: 2.9
作者:
Hughes,RE;Brzovic,PS;Klevit,RE;Hurley,JB
通讯作者: Hurley,JB