Mutations in β‐actin: influence on polymer formation and on interactions with myosin and profilin

FEBS Letters

Lindberg, Uno²  Schutt, Clarence E.¹  Karlsson, Roger³  Aspenström, Pontus³ 

[1] The Henry H. Hoyt Laboratory, Department of Chemistry, Princeton University, Princeton, NJ 08544, USA;Department of Zoological Cell Biology, W-GI, Stockholm University, S-10691 Stockholm, Sweden;Department of Developmental Biology, BMC, Box 587, Uppsala University, S-751 23 Uppsala, Sweden

关键词: Actin mutant;    Heterologous expression;    Yeast;    Polymerization;    Actomyosin interaction;    Profilin interaction;   

DOI  :  10.1016/0014-5793(93)80215-G

学科分类：生物化学/生物物理

来源: John Wiley & Sons Ltd.

【 摘 要 】

Two β-actin mutants, one with proline 38 replaced with alanine (P38A) and the other with cysteine-374 replaced with serine (C374S), as well as the wild-type β-actin, were expressed in the yeast, S. cerevisiae, purified to homogeneity, and analyzed in vitro for polymerizability and interaction with DNase I, myosin, and profilin. Both mutations interfered with the polymerization of the actin, and with its interaction with myosin. The C374S mutation had the most pronounced effect; it reduced the polymerizability of the actin, abolished its binding to profilin, and filaments containing this mutation moved at reduced rates in the in vitro ‘motility assay’. The ATPase activity measured in solutions containing myosin subfragment 1 was similar for both the mutant and wild-type actins.

【 授权许可】

Unknown