Protein Kinase CK2 Cellular Function in Normal and Disease States

Protein Kinase CK2 Cellular Function in Normal and Disease States
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正常和疾病状态下蛋白激酶 CK2 细胞功能

DOI:
10.1007/978-3-319-14544-0
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发表时间:
2015
期刊:
影响因子:
3.7
通讯作者:
R. Szyszka
R. Szyszka
中科院分区:
综合性期刊3区
文献类型:
--
作者:
K. Ahmed;O. Issinger;R. Szyszka

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蛋白激酶 CK2 活性的天然调节剂可分为两类。第一种物质,聚阳离子,如聚胺和聚赖氨酸能够刺激酶活性。另一方面,肝素(聚阴离子)等化合物对 CK2 活性具有抑制特性。 Asf1 的序列具有 5 个潜在的 CK2 磷酸化位点,但它似乎并不构成磷酸化的基础。酵母 Asf1 氨基酸序列在其 C 末端含有一个特征性酸性片段。这种称为伪底物区的调节亚基序列存在于多种蛋白激酶中,例如 PKA 和 PKG,也可以在 CK2 的调节亚基中找到。实验数据假设在比较对每个催化亚基本身以及相应的全酶的影响时,Asf1 以不同的方式对蛋白激酶 CK2 产生调节作用。
Natural modulators of protein kinase CK2 activity might be divided into two groups. Substances of the fi rst one, polycations, like polyamines and polylysine are able to stimulate enzyme activity. On the other hand, compounds like heparin (polyanions) have inhibitory properties towards CK2 activity. The sequence of Asf1 possesses fi ve potential phosphorylation sites for CK2, but it seems that it does not underlie phosphorylation. Yeast Asf1 amino acid sequence contains a characteristic acidic fragment at its C-terminus. Such a sequence, called pseudosubstrate region, of regulatory subunits is present in several protein kinases, like PKA and PKG, and can be also found in the regulatory subunit of CK2. Experimental data suppose a modulating effect of Asf1 towards protein kinase CK2 in a different manner when comparing the infl uence on each catalytic subunits itself as well as the corresponding holoenzymes.
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