CalA, a cyAbrB protein, binds to the upstream region of ftsZ and is down-regulated in heterocysts in Anabaena sp. PCC 7120

CalA, a cyAbrB protein, binds to the upstream region of ftsZ and is down-regulated in heterocysts in Anabaena sp. PCC 7120
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CalA 是一种 cyAbrB 蛋白,与 ftsZ 的上游区域结合,并在鱼腥藻的异形胞中下调。

DOI:
10.1007/s00203-010-0573-9
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发表时间:
2010-04
影响因子:
2.8
通讯作者:
徐旭东
徐旭东
中科院分区:
生物学4区
文献类型:
--
作者:
徐旭东

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利用DNA亲和层析技术,从鱼腥藻/念珠藻属PCC 7120的ftsZ基因启动子区分离得到一个cyAbrB家族的调节蛋白Alr 0946(CalA)。电泳迁移率变动分析表明,该蛋白质可以结合到ftsZ的上游区域(作为生物素标记的DNA片段),并且该结合被相同的DNA片段和hetC上游的片段抑制,但不被glnA,hetR或ntcA上游的3个片段抑制。与gfp(绿色荧光蛋白)的转录融合和Western blot分析均表明,calA在异形胞中的表达相对于营养细胞下调。calA的插入突变体不能完全分离。calA在鱼腥藻/念珠藻中的过表达没有引起生长、异形胞分化或ftsZ表达的变化。CalA作为DNA结合蛋白对鱼腥藻/念珠藻的生长是必需的,并且可能是ftsZ在营养细胞中表达所必需的。
A protein of cyAbrB family of regulators, Alr0946 (CalA), was identified by DNA affinity chromatography using DNA fragments from the promoter region of ftsZ in Anabaena/Nostoc sp. PCC 7120. Electrophoretic mobility shift assays showed that the protein could bind to upstream regions of ftsZ (as biotin-labeled DNA fragments) and that the binding was inhibited by the same DNA fragments and a fragment upstream of hetC but not by 3 fragments upstream of glnA, hetR or ntcA. Both transcriptional fusion with gfp (green fluorescence protein) and Western blot analysis indicated that the expression of calA was down-regulated in heterocysts relative to vegetative cells. An insertional mutant of calA could not be completely segregated. Over-expression of calA in Anabaena/Nostoc caused no change in growth, heterocyst differentiation or expression of ftsZ. CalA as a DNA-binding protein is essential for the growth of Anabaena/Nostoc and may be required for the expression of ftsZ in vegetative cells.
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