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Models in which many cross-bridges attach simultaneously can explain the filament movement per ATP split during muscle contraction.

Abstract：

:Contractile filaments in skeletal muscle are moved by less than 2nm for each ATP used. If just one cross-bridge is attached to each thin filament at any instant then this distance represents the fundamental myosin cross-bridge step size (i.e. the distance one cross-bridge moves a thin filament in one ATP-splitting cycle). However, most contraction models assume many cross-bridges are attached at any instant along each thin filament. The purpose of this study was to establish whether the net filament sliding per ATP used could be explained quantitatively in terms of a cross-bridge model in which multiple cross-bridges are attached along each thin filament. It was found that the relationship between net filament sliding per ATP split and the load against which the muscle shortens is compatible with such a model and furthermore predicts that the cross-bridge step size is between 7.5 and 12.5nm over most of the range of loads. These values were similar for different muscle fibre types.

journal_name

Int J Biol Macromol

journal_title

International journal of biological macromolecules

authors

Barclay CJ

doi

10.1016/s0141-8130(03)00047-3

keywords:

subject

Has Abstract

pub_date

2003-09-01 00:00:00

pages

139-47

issue

3-5

eissn

0141-8130

issn

1879-0003

pii

S0141813003000473

journal_volume

32

pub_type

杂志文章

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