细胞的基本结构
细胞的基本结构
细胞骨架 Cytoskeleton a The cytoskeleton is a network of protein filaments throughout the cells cytoplasm
细胞骨架 Cytoskeleton： ◼ The cytoskeleton is a network of protein filaments throughout the cell’s cytoplasm
The cytoskeleton contains three types a Microfilaments(Actin filaments a Intermediate filaments ■ Microtube|es
The cytoskeleton contains three types : ◼ Microfilaments (Actin filaments) ◼ Intermediate filaments ◼ Microtubules
Tubuli molecule Actin molecule 20 nm 5 nm 10 nm ( b) Microtubule Neurofilament Microfilament
Common Features a Linear polymers of protein subunits a Filaments are dynamic, they can assemble and disassemble
Common Features : ◼ Linear polymers of protein subunits ◼ Filaments are dynamic, they can assemble and disassemble
Actin filaments Intermediate filaments Microtubules
Actin filaments Intermediate filaments Microtubules
Microtubule
Microtubule
微管 tubulin microtubule
微管
■呈中空的圆柱状结构,管壁由13条原纤维 ( protofil| aments纵向排列而成 主要成分是徼管蛋白( tubulin)和微管结 合蛋白
◼ 呈中空的圆柱状结构，管壁由13条原纤维 (protofilaments)纵向排列而成 ◼ 主要成分是微管蛋白（tubulin）和微管结 合蛋白
■微管蛋白呈球形,一般以异二聚体形式存 在,主要有a和β两种亚单位 每一个异二聚体都有 GTP/GDP、Mg2+、 Ca2+、秋水仙素和长春碱的结合位点
◼ 微管蛋白呈球形，一般以异二聚体形式存 在，主要有α和β两种亚单位。 ◼ 每一个异二聚体都有GTP/GDP、Mg2＋ 、 Ca2＋ 、秋水仙素和长春碱的结合位点