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Tissue distribution, subcellular localization, and enzymatic activity analysis of human SIRT5 isoforms

机译:组织分布,亚细胞定位和人体SIRT5同种型的酶活性分析

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摘要

SIRT5 is one of the seven mammalian sirtuins which are NAD+-dependent deacylases. In human beings,SIRT5gene encodes for four SIRT5 protein isoforms, namely SIRT5iso1, SIRT5iso2, SIRT5iso3, and SIRT5iso4. Previous studies have focused mostly on SIRT5iso1. Characteristics regarding localization, activity and tissue distribution of the other three SIRT5 isoforms remain unclear. In the present study, we characterized these properties of these SIRT5 isoforms. We found that SIRT5iso1?3were mitochondria-localized, while SIRT5iso4localized mainly in cytoplasm. SIRT5iso2?4had little deacylase activity comparing with SIRT5iso1. Although cDNAs of all SIRT5 isoforms were readily detected in multiply tissues according to EST database, proteins of SIRT5iso2?4were seldom observed in human cell lines. Altogether, we dissected the four isoforms of human SIRT5 protein.
机译:SIRT5是七种哺乳动物六乳酸的六种依赖性脱酰胺酶之一。 在人类中,SIRT5Gene编码四个SIRT5蛋白同种型,即Sirt5iso1,Sirt5iso2,Sirt5iso3和Sirt5iso4。 以前的研究主要集中在Sirt5iso1上。 关于定位,其他三种SIRT5同种型的定位,活性和组织分布的特性仍不清楚。 在本研究中,我们表征了这些SIRT5同种型的这些性质。 我们发现SIRT5ISO1?3次线粒体定位,而SIRT5ISO4分红主要在细胞质中。 SIRT5ISO2?4与SIRT5ISO1相比,少许脱霉菌酶活性。 虽然根据EST数据库,在繁殖组织中容易检测到所有SIRT5同种型的CDNA,但SIRT5ISO2的蛋白质在人细胞系中很少观察到苏联蛋白。 完全,解释了人体SIRT5蛋白的四种同种型。

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