![Signalchem/TRDMT1 (DNMT2) siRNA Set I/20 nmol/T352-911-20](images/Signalchem/smallvial.jpg)
Overview:
TRDMT1 is responsible for the methylation of aspartic acid transfer RNA, specifically at the cytosine-38 residue in the anticodon loop. TRDMT1 also possesses residual DNA-(cytosine-C5) methyltransferase activity. While similar in sequence and structure to DNA cytosine methyltransferases, TRDMT1 is distinct and highly conserved in its function among various species. The indirect sequence recognition is also a feature of eukaryotic DNA methyltransferases, which may have arisen from a DNMT2-like RNA methyltransferase (1). DNMT2 is involved in retrotransposon silencing and telomere integrity in somatic cells (2).
Gene Aliases:
DNMT2; DMNT2; PUMET; RNMT1; MHSAIIP
Genbank Number:
BC047733
References:
1. Goll, M. G. et.al: Methylation of tRNA(Asp) by the DNA methyltransferase homolog Dnmt2. Science 311: 395-397, 2006. 2. Phalke, S. et.al: Retrotransposon silencing and telomere integrity in somatic cells of Drosophila depends on the cytosine-5 methyltransferase DNMT2. Nature Genet. 41: 696-702, 2009.
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1970科家致癌RNA病毒发现种特殊RNA病毒聚合酶,该酶能RNA模板,根据碱基互补原则.程与般病毒转录向相反,故称逆转录,催化程酶称逆转录酶,发现哺乳物胚胎细胞裂淋巴细胞含.
逆转录病毒称携带逆转录酶病毒,先侵入宿主细胞病毒RNA模板,靠酶形DNA环化,合宿主细胞染色体原病毒形式宿主细胞代代传.
HIV(艾滋病病毒)典型逆转录病毒
⒈通过嵌入DNA双链的碱基之间,形成稳定复合物,抑制DNA复制与RNA合成,从而阻碍快速生长的癌细胞的分裂。
⒉抑制拓扑异构酶II,影响DNA超螺旋转化成为松弛状态,从而阻碍DNA复制与转录。有研究显示拓扑异构酶II抑制剂(除蒽环类药物还包括依托泊苷等)能够阻止拓扑异构酶II的翻转,而这点对于它从它的核酸底物上脱离是必需的。这就意味着,拓扑异构酶II抑制剂使拓扑异构酶II的复合物在DNA链断裂之后才能更稳定,导致后者催化了DNA的破坏;同时,拓扑异构酶II抑制剂还能阻碍连接酶对DNA的修复。
⒊螯合铁离子后产生自由基从而破坏DNA、蛋白质及细胞膜结构。向左转|向右转
最近遇到了实验上的大问题,就是用一步法做RNA的荧光定量PCR时,发现低浓度的做不出来,而DNA是可以的,想请问各位在一步法PCR中有没有什么高见,就是逆转录的Buffer有没有什么需要注意的地方!就是在逆转录酶的最适Buffer和Taq酶的最适Buffer中寻找一个最适的Buffer!
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