Overview:
PDE9A is a member of the phosphodiesterase (PDE) family that catalyzes the hydrolysis of cGMP to the monophosphate and thus plays an important role in signal transduction by regulating the intracellular concentration of cyclic nucleotides (1). Multiple transcript variants encoding several different isoforms have been found for PDE9A (2). These mRNAs differ in the use of specific combinations of exons located at the 5' end of the gene while the 3' half, encoding the catalytic domain of the protein, always has the same combination of exons. PDE9A has been used in the study of gene- disease association, gene-environment interaction, and pharmacogenomic/toxicogenomic. PDE9A is mainly expressed in spleen, small intestine, and brain.
Gene Aliases:
FLJ90181; HSPDE9A2
Genbank Number:
NM_001001567
References:
1. Fisher, D A. et al: Isolation and characterization of PDE9A, a novel human cGMP-specific phosphodiesterase. J. Biol. Chem. 273: 15559-15564, 1998.2. Soderling, S H. et al: Identification and characterization of a novel family of cyclic nucleotide phosphodiesterases. J. Biol. Chem. 273: 15553-15558, 1998.
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我在做5RACE,选用TaKaRa公司的RNA反转录酶(RNaseH-),不知道这个酶好不好,有什么需要注意的。
没有序列识别的功能,他就是简单的催化相邻DNA链的5-P末端和3'-OH末端以磷酸二酯键结合的反应,需ATP作辅酶。 不仅可以催化粘性末端之间或平滑末端之间的DNA的连接,也催化DNA与RNA之间以及少数RNA之间的连接。
反转录酶(Reversetranscripatase)是以RNA为模板指导三磷酸脱氧核苷酸合成互补DNA(cDNA)的酶。哺乳类C型病毒的反转录酶和鼠类B型病毒的反转录酶都是一条多肽链。鸟类RNA病毒的反转录酶则由两上亚基结构。真核生物中也都分离出具有不同结构的反转录酶。

