来源:分离自沙门氏菌噬菌体 SP6(Salmonella phage SP6),属于单亚基 RNA 聚合酶家族。
分子特性:
分子量:约 94 kDa,由约 830 个氨基酸残基组成。
结构域:包含 N 端的 DNA 结合结构域(识别 SP6 启动子)和 C 端的催化结构域(负责 RNA 链的延伸)。
辅助因子:需要镁离子(Mg²⁺)激活,依赖 ATP、GTP、CTP、UTP 作为底物。
体外转录:以含有 SP6 启动子序列的 DNA 为模板,特异性结合启动子(5'-ATTTAGGTGACACTATAG-3'),催化 RNA 链从 + 1 位起始合成。
产物类型:合成单链 RNA,包括正义 RNA(sense RNA)、反义 RNA(antisense RNA)、小干扰 RNA(siRNA)前体、信使 RNA(mRNA)等。
应用场景:
制备 RNA 探针(用于 Northern blot、原位杂交);
合成体外翻译模板;
生产 siRNA 或 miRNA 用于基因沉默研究;
合成 CRISPR 实验所需的 gRNA。
高度特异性:仅识别 SP6 启动子的 17 bp 保守序列,与其他噬菌体聚合酶(如 T7、T3)的启动子无交叉反应。
高效性:在适宜条件下(37℃,优化缓冲液),可合成长达数 kb 的 RNA,产率高达 1 μg/μL 反应体系。
依赖模板结构:需 DNA 模板的启动子区域处于双链状态,且 RNA 合成方向为 5'→3'。
Origin: Isolated from Salmonella phage SP6, belonging to the single-subunit RNA polymerase family.
Molecular Features:
Molecular Weight: Approximately 94 kDa, composed of ~830 amino acid residues.
Structural Domains: Contains an N-terminal DNA-binding domain (recognizes SP6 promoter) and a C-terminal catalytic domain (mediates RNA chain elongation).
Cofactors: Requires magnesium ions (Mg²⁺) for activation and uses ATP, GTP, CTP, and UTP as substrates.
In Vitro Transcription: Uses DNA templates containing the SP6 promoter sequence, specifically binding to the promoter (5'-ATTTAGGTGACACTATAG-3') to initiate RNA synthesis from the +1 position.
Product Types: Synthesizes single-stranded RNA, including sense RNA, antisense RNA, siRNA precursors, and messenger RNA (mRNA).
Applications:
Preparation of RNA probes (for Northern blot, in situ hybridization);
Synthesis of templates for in vitro translation;
Production of siRNA/miRNA for gene silencing studies;
Generation of gRNA for CRISPR experiments.
High Specificity: Recognizes only the 17 bp conserved sequence of the SP6 promoter, with no cross-reactivity to promoters of other phage polymerases (e.g., T7, T3).
High Efficiency: Capable of synthesizing RNA up to several kilobases in length under optimal conditions (37℃, optimized buffer), with yields up to 1 μg/μL reaction volume.
Template Dependency: Requires the promoter region of the DNA template to be double-stranded, with RNA synthesis proceeding in the 5'→3' direction.
郑州赫昂生物科技有限公司
联系商家时请提及chemicalbook,有助于交易顺利完成!
无细胞客服