Molecular cloning and characterization of a novel muscle adenylosuccinate synthetase, AdSSL1, from human bone marrow stromal cells

Molecular cloning and characterization of a novel muscle adenylosuccinate synthetase, AdSSL1, from human bone marrow stromal cells
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来自人骨髓基质细胞的新型肌肉腺苷酸琥珀酸合成酶 AdSSL1 的分子克隆和表征

DOI:
10.1007/s11010-005-2539-9
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发表时间:
2005
影响因子:
4.3
通讯作者:
Xuetao Cao
Xuetao Cao
中科院分区:
生物学3区
文献类型:
--
作者:
Hongying Sun;Nan Li;Xiaojian Wang;Taoyong Chen;Liyun Shi;Lihuang Zhang;Jianli Wang;T. Wan;Xuetao Cao

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脊椎动物具有腺苷酸琥珀酸合成酶(AdSS,EC 6.3.4.4)的肌肉和非肌肉同工酶,其催化AMP合成中的第一个关键步骤。从人骨髓基质细胞中鉴定出一种新的腺苷酸琥珀酸合成酶同工酶--人AdSSL 1。AdSSL 1与小鼠肌肉型AdSS 1具有98%的同源性,并且包含腺苷酸琥珀酸合成酶的保守序列和结构特征。人AdSSL 1基因定位于染色体14p32.33。刺激后,白血病细胞表达AdSSL 1的时间依赖性的方式不同于非肌肉腺苷琥珀酸合成酶。人AdSSL 1主要在骨骼肌和心脏组织中表达,这与该酶在肌肉代谢中的潜在作用一致。COS-7细胞中AdSSL 1蛋白的表达定位于胞浆。重组AdSSL 1蛋白具有典型的催化腺苷酸琥珀酸形成的酶活性。鉴定人AdSSL 1在肌肉组织中的主要表达将有助于将来对肌肉生理学中的酶进行遗传和生化分析。(Mol Cell Biochem 269:85-94,2005)
Vertebrates have muscle and non-muscle isozymes of adenylosuccinate synthetase (AdSS, EC 6.3.4.4), which catalyzes the first committed step in AMP synthesis. A novel muscle isozyme of adenylosuccinate synthetase, human AdSSL1, is identified from human bone marrow stromal cells. AdSSL1 is 98% identical to mouse muscle type AdSS1 and contains conserved sequence and structural features of adenylosuccinate synthetase. Human AdSSL1 gene is mapped to chromosome 14p32.33. After stimulation, leukemia cells express AdSSL1 in a time-dependent manner different from that of non-muscle adenylosuccinate synthetase. The human AdSSL1 is predominantly expressed in skeletal muscle and cardiac tissue consistent with the potential role for the enzyme in muscle metabolism. Overexpressed AdSSL1 protein in COS-7 cells locates in cytoplasm. Recombinant AdSSL1 protein possesses typical enzymatic activity to catalyze adenylosuccinate formation. The identification of human AdSSL1 with predominant expression in muscle tissue will facilitate future genetic and biochemical analysis of the enzyme in muscle physiology. (Mol Cell Biochem 269: 85–94, 2005)
双嘧达莫对突变鼠 T 淋巴细胞嘌呤过量产生和排泄的生化作用。
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