编码蛋氨酸腺苷转移酶(MAT II)调控β亚基的人MAT2B基因的调控。
文章的细节
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引用
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LeGros L, Halim AB, Chamberlin ME, Geller A, Kotb M
编码蛋氨酸腺苷转移酶(MAT II)调控β亚基的人MAT2B基因的调控。
生物化学学报,2001;27(7):24918- 2424。Epub 2001年5月3日
- PubMed ID
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11337507 (PubMed视图]
- 摘要
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蛋氨酸腺苷转移酶(Methionine adenosyltransferase, MAT)催化s -腺苷蛋氨酸(AdoMet)的生物合成,是转甲基化反应和多胺生物合成的关键分子。MAT II同工酶由催化α 2和调节β亚基组成。MAT II β亚基表达的下调导致细胞内AdoMet水平增加6-10倍。为了了解β亚基表达调控的机制,我们克隆了MAT2B基因,确定了其组织结构,表征了其5'-侧翼序列,并阐明了其启动子的体外和体内调控。MAT2B基因的转录起始位置为相对于翻译起始位点的-203。启动子缺失分析确定了+52和+93碱基对之间的最小启动子,这是一个富含gc的区域。-4 ~ +52序列的加入增强了启动子活性;这主要是因为Sp1识别位点位于+9/+15。包含到-115位的序列提供了充分的活性;这是塔塔在-32度时造成的。 The Sp1 site at position +9 was key for the formation of protein.DNA complexes. Mutation of both the Sp1 site at +9 and the TATA at -32 reduced promoter activity to its minimal level. Supershift assays showed no effect of the anti-Sp1 antibody on complex formation, whereas the anti-Sp3 antibody had a strong effect on protein.DNA complex formation, suggesting that Sp3 is one of the main factors binding to this Sp1 site. Chromatin immunoprecipitation assays supported the involvement of both Sp1 and Sp3 in complexes formed on the MAT2B promoter. The data show that the 5'-untranslated sequences play an important role in regulating the MAT2B gene and identifies the Sp1 site at +9 as a potential target for modulating MAT2B expression, a process that can have a major effect on intracellular AdoMet levels.
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- 药物酶
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药物 酶 种类 生物 药理作用 行动 甲硫氨酸 蛋氨酸腺苷转移酶2亚基 蛋白质 人类 未知的底物细节 - 多肽
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名字 UniProt ID 蛋氨酸腺苷转移酶2亚基 Q9NZL9 细节