FtsZ在钝顶螺旋藻形态建成中的作用

为了研究细胞骨架蛋白FtsZ在螺旋藻形态建成中的作用,通过PCR克隆了ftsZ基因并进行原核表达,对表达的融合蛋白进行了纯化。通过免疫小鼠制备了FtsZ的多克隆抗体。分别用Western blot和免疫荧光技术检测螺旋藻不同形态藻丝体中ftsZ的表达和定位。结果表明,在两株不同螺旋藻Spirulina platensisFACHB869和FACHB882中,ftsZ在直线形藻丝体中的表达量都高于螺旋形藻丝体。免疫荧光定位结果显示,FtsZ蛋白在藻细胞中呈环状分布于细胞膜上,且这种环状结构在直线形藻丝体中排列较密而在螺旋形藻丝体中排列疏松。ftsZ在不同形态藻丝体中的表达量和细胞定位差异说明,细胞骨架蛋白FtsZ可能通过改变细胞刚性而参与螺旋藻形态建成。

THE FUNCTION OF FTSZ IN MORPHOGENESIS OF SPIRULINA PLATENSIS

To explore the function of prokaryotic cytoskeleton protein FtsZ in morphogenesis of Spirulina platensis,the gene encoding FtsZ was cloned into pET-28a vector and highly expressed in E.coli BL21.The target protein purified by affinity chromatography was used to immunize mice to prepare polyclonal antibodies.The differences in expression and localization of FtsZ between linear and spiral forms of Spirulina platensis were determined by western blot and immunofluorescence respectively.Both the results of western blotting from two strains of Spirulian plantensis showed that the expression level of Ftsz in linear algal trichomes was higher than that of spiral forms.FtsZ were localized underneath the cell membrane at the future division site,forming a ring-like structure known as the Z-ring.The Z-ring distributed more tightly in linear forms than that in spiral forms.The differences in expression and localization of FtsZ between linear and spiral forms of Spirulina platensis mean that cytoskeleton FtsZ probably plays an important role in morphogenesis of Spirulina platensis.