整合生物学期刊网

Plant Diversity ›› 2006, Vol. 28 ›› Issue (04): 425-428.

• 研究论文 • 上一篇    下一篇

萱草花粉中微管蛋白生物化学性质

廖俊杰; 吴英杰; 阎隆飞    

  1. 中国农业大学生物学院植物生理生化国家开放重点实验室
  • 收稿日期:2006-01-16 出版日期:2006-08-25 发布日期:2006-08-25
  • 通讯作者: 吴英杰

Biochemical Characterization of the Pollen Tubulin from Day Lily ( Hemerocallis fulva , Liliaceae)

LIAO Jun-Jie; WU Ying-Jie; YAN Long-Fei   

  1. State Key Laboratory of Plant Physiology and Biochemistry , China Agricultural University
  • Received:2006-01-16 Online:2006-08-25 Published:2006-08-25
  • Contact: WU Ying-Jie

摘要: 微管(microtubule ) 是细胞骨架的重要成份, 参与囊泡运输、信息传递等多种生命活动。我们从萱草花粉中纯化了植物微管蛋白, 对其生物化学及生物物理学部分性质研究表明, 纯化的微管蛋白经超离心法测定沉降系数为6.2S, SDS-PAGE 分析α, β 微管蛋白分子量为56 kD、58 kD, 凝胶扫描分析纯度为93.7%。等电聚焦电泳测定等电点为pI = 5.35。光谱学性质研究结果表明, 最大紫外吸收峰为280.8 nm,荧光光谱研究表明最大激发波长为282 nm; 此时的最大发射峰为338 nm, 圆二色光谱分析二级结构表明α-螺旋占27.24%, β-折叠占24.48%, 无规卷曲为48.28%, 呈典型球蛋白特征。

关键词: 微管蛋白, 微管, 花粉, 萱草FONT

Abstract: Eucaryotic cells contain a complex network of filamentous proteins collectively called the cytoskeleton, which participates in many cellular functions, including organelle motility and information transfer. Tubulins are one of the main
components of the cell cytoskeleton. Tubulins of high purity were prepared from day lily pollen grains, and were biochemically and biophysically characterized in this study. The molecular weight ofα-andβ- tubulin from day lily pollen is about 56 kD and 58 kD on SDS-PAGE, respectively. The purity is 93.7% by scanning analysis. The tubulin has a sedimentation coefficient of 6.2S and an isoelectric point of about 5.35. The maximum ultraviolet absorption is 280.8 nm. Fluorescence emission wave length of day lily tubulin is 338 nm by excitation at 282 nm. Circular dichroism (CD) spectrum analysis showed that the percentage ofα-helix, β-sheet and random coil of day lily tubulin is 27.24%, 24.48% and 48.28%, respectively, indicating a typical feature of globulin.

Key words: Tubulin

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