The dipyridyls paraquat and diquat attenuate the interaction of G-actin with thymosin beta4.

Abstract:

:Beta-thymosins sequester G-actin and preserve a pool of monomers of actin which constitute an important prerequisite for cellular function of the microfilament system. To study the influence of paraquat binding to G-actin on the interaction of G-actin with thymosin beta4 we determined the apparent dissociation constant of the G-actin-thymosin beta4 complex in the absence or presence of paraquat using an ultrafiltration assay. Paraquat (1,1'-dimethyl-4,4'-dipyridylium dichloride) attenuates this interaction in a concentration- and time-dependent manner. When exposed to 10 mM paraquat, the apparent dissociation constant increased 10-85-fold within 15 min to 24 h. After incubation for 24 h even a paraquat concentration as low as 100 microM increased the dissociation constant of the G-actin-thymosin beta4 complex from 0.66 microM to 0.82 microM (P < 0.05). Diquat (1,1'-ethylene-2,2'-dipyridylium dibromide) similarly weakens the interaction of G-actin and beta-thymosins. In none of the experiments was oxidation of the methionine residue or any other modification of thymosin beta4 detected. Therefore we conclude that the dipyridyls paraquat and diquat directly interact with G-actin and thereby impede the interaction between G-actin and thymosin beta4.

journal_name

FEBS Lett

journal_title

FEBS letters

authors

Huff T,Cappelletti G,Hannappel E

doi

10.1016/s0014-5793(98)00295-6

subject

Has Abstract

pub_date

1998-04-03 00:00:00

pages

495-8

issue

3

eissn

0014-5793

issn

1873-3468

pii

S0014-5793(98)00295-6

journal_volume

425

pub_type

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