Exploring Obscurin and SPEG Kinase Biology.

Exploring Obscurin and SPEG Kinase Biology.
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DOI:
10.3390/jcm10050984
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发表时间:
2021-03-02
影响因子:
3.9
通讯作者:
Lange S
Lange S
中科院分区:
医学2区
文献类型:
--
作者:
Fleming JR;Rani A;Kraft J;Zenker S;Börgeson E;Lange S

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包含对心肌和横纹肌具有重要信号传导功能的串联激酶结构域的obscurin蛋白家族的三个成员是巨大蛋白obscurin、其obscurin相关激酶剪接同种型和横纹肌富集蛋白激酶(SPEG)。虽然有越来越多的证据表明每个单独的激酶结构域在横纹肌中发挥的特定作用,但它们的生物学和调节仍然是个谜。我们目前的研究集中在激酶结构域1和邻近的低序列复杂性激酶结构域间连接obscurin和SPEG。使用Phos标签凝胶,我们发现,在obscurin的接头包含几个磷酸化位点,而在SPEG相同的区域保持未磷酸化。我们的同源性建模,突变分析和分子对接表明,激酶1在obscurin港口的所有关键氨基酸的催化功能,这一领域的行动导致蛋白质的自磷酸化的重要。我们的生物信息学分析还分配了一个清单的激酶结构域1 obscurin和SPEG的推定底物,根据已知的和我们新提出的磷酸化位点的肌肉蛋白,包括obscurin本身。
Three members of the obscurin protein family that contain tandem kinase domains with important signaling functions for cardiac and striated muscles are the giant protein obscurin, its obscurin-associated kinase splice isoform, and the striated muscle enriched protein kinase (SPEG). While there is increasing evidence for the specific roles that each individual kinase domain plays in cross-striated muscles, their biology and regulation remains enigmatic. Our present study focuses on kinase domain 1 and the adjacent low sequence complexity inter-kinase domain linker in obscurin and SPEG. Using Phos-tag gels, we show that the linker in obscurin contains several phosphorylation sites, while the same region in SPEG remained unphosphorylated. Our homology modeling, mutational analysis and molecular docking demonstrate that kinase 1 in obscurin harbors all key amino acids important for its catalytic function and that actions of this domain result in autophosphorylation of the protein. Our bioinformatics analyses also assign a list of putative substrates for kinase domain 1 in obscurin and SPEG, based on the known and our newly proposed phosphorylation sites in muscle proteins, including obscurin itself.
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