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标题：Myosin V processivity: Multiple kinetic pathways for head-to-head coordination
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作者：Josh E. Baker ; Elena B. Krementsova ; Guy G. Kennedy 等
期刊名称：Proceedings of the National Academy of Sciences
印刷版ISSN：0027-8424
电子版ISSN：1091-6490
出版年度：2004
卷号：101
期号：15
页码：5542-5546
DOI：10.1073/pnas.0307247101
语种：English
出版社：The National Academy of Sciences of the United States of America
摘要：Myosin V, a double-headed molecular motor, transports organelles within cells by walking processively along actin, a process that requires coordination between the heads. To understand the mechanism underlying this coordination, processive runs of single myosin V molecules were perturbed by varying nucleotide content. Contrary to current views, our results show that the two heads of a myosin V molecule communicate, not through any one mechanism but through an elaborate system of cooperative mechanisms involving multiple kinetic pathways. These mechanisms introduce redundancy and safeguards that ensure robust processivity under differing physiologic demands.