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Evidence for potential functionality of nuclearly-encoded humanin isoforms.

机译:核编码的人源蛋白亚型潜在功能的证据。

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摘要

Humanin (HN) is a recently identified neuroprotective and antiapoptotic peptide derived from a portion of the mitochondrial MT-RNR2 gene. We provide bioinformatic and expression data suggesting the existence of 13 MT-RNR2-like nuclear loci predicted to maintain the open reading frames of 15 distinct full-length HN-like peptides. At least ten of these nuclear genes are expressed in human tissues, and respond to staurosporine (STS) and beta-carotene. Sequence comparisons of the nuclear HN isoforms and their homologues in other species reveal two consensus motifs, encompassing residues 5-11 (GFS/NCLLL), and 14-19 (SEIDLP/S). Proline vs serine in position 19 may determine whether the peptide is secreted or not, while threonine in position 13 may be important for cell surface receptor binding. Cytoprotection against the STS-induced apoptosis conferred by the polymorphic HN5 variant, in which threonine in position 13 is replaced with isoleucine, is reduced compared to the wild type HN5 peptide.
机译:Humanin(HN)是最近发现的一种来自线粒体MT-RNR2基因一部分的神经保护和抗凋亡肽。我们提供的生物信息学和表达数据表明存在13个MT-RNR2样核基因座,预计将维持15个不同的全长HN样肽的开放阅读框。这些核基因中至少有十个在人体组织中表达,并对星形孢菌素(STS)和β-胡萝卜素有反应。核HN同工型及其同系物在其他物种中的序列比较揭示了两个共有基序,包括残基5-11(GFS / NCLLL)和14-19(SEIDLP / S)。位置19的脯氨酸对丝氨酸可能决定肽是否分泌,而位置13的苏氨酸对于细胞表面受体结合可能很重要。与野生型HN5肽相比,针对多态性HN5变异体(其中第13位的苏氨酸被异亮氨酸替代)赋予的针对STS诱导的凋亡的细胞保护作用降低。

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