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Structure of the actin-myosin complex produced by crosslinking in the presence of ATP.

Abstract：

:The structure of the actin-myosin complex during ATP hydrolysis was studied by covalently crosslinking myosin subfragment 1 (S1) to F-actin in the presence of nucleotides (especially ATP) using 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide. The fluorescence energy transfer was measured between N-(iodoacetyl)-N'-(1-sulfo-5-naphthyl)ethylenediamine and 6-(iodoacetamide)fluorescein bound to the SH1 thiol of S1 and the Cys374 thiol of actin. The covalent acto-S1, produced by crosslinking in the absence of nucleotide or in the presence of ADP, showed transfer efficiency of 0.50 to 0.52 and intersite distance of 4.5 to 4.7 nm, which were equal to those obtained with non-crosslinked acto-S1 in the absence of nucleotide. However, the covalent acto-S1, produced by crosslinking in the presence of either 5'-adenylyl imidodiphosphate (AMPPNP) at high ionic strength or ATP, showed a significant decrease in the efficiency to 0.26 to 0.34 and hence an increase in the distance to 5.2 to 5.5 nm. These results suggest that AM-ATP and/or AM-ADP-P (formed during ATP hydrolysis) and AM-AMPPNP have a very different conformation from AM and AM-ADP (in which A is actin and M is myosin).

journal_name

J Mol Biol

journal_title

Journal of molecular biology

authors

Arata T

doi

10.1016/0022-2836(86)90426-2

subject

Has Abstract

pub_date

1986-09-05 00:00:00

pages

107-16

issue

1

eissn

0022-2836

issn

1089-8638

pii

0022-2836(86)90426-2

journal_volume

191

pub_type

杂志文章

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