Does the myosin V neck region act as a lever?
Does the myosin V neck region act as a lever?
复制标题
肌球蛋白 V 颈区域是否起到杠杆作用？
DOI：
10.1023/b:jure.0000021394.48560.71
复制
发表时间：
2004
影响因子：
2.7
通讯作者：
Warshaw,DavidM
中科院分区：
文献类型：
--
作者：
Moore,JeffreyR;Krementsova,ElenaB;Trybus,KathleenM;Warshaw,DavidM
Recent research efforts from several groups have addressed the question of whether the amplitude of myosin's unitary step size is proportional to the length of the neck region. Unconventional myosin V, which has an extended neck region with 6IQ motifs, provides a natural template by which to test the lever arm model via mutational analysis. The most stringent test requires that a series of single-headed molecules from the same myosin class be analyzed. Here we characterized the unitary mechanics of three single-headed fragments of myosin V expressed in the baculovirus/insect cell system. Each construct consisted of the motor domain (MD) and a variable number of IQ motifs (MD2IQ, MD4IQ and MD6IQ) that bind calmodulin, followed by an epitope tag so that the molecule can be attached to the nitrocellulose surface via an antibody. The results show a correlation between the unitary step size and the number of IQ motifs, confirming that the myosin neck region acts as a lever. The step size of MD2IQ is twice that observed from single-headed subfragments of class II myosins with the same neck length. Our results are discussed in relation to data obtained concurrently from other laboratories with similar constructs.
