MEKA/phosducin attenuates hydrophobicity of transducin beta gamma subunits without binding to farnesyl moiety.

Abstract:

:Hydrophobic modifications of transducin (T) gamma, such as farnesyl-and carboxyl-methylation, are essential for the association of T beta gamma with the photoreceptor disc membrane, and MEKA/phosducin is known to inhibit the association. In this study, we examined the effect of MEKA on the hydrophobicity of T beta gamma. MEKA could bind to T beta gamma without farnesyl/carboxyl-methyl moieties as well as native T beta gamma. In the Triton X-114 phase separation assay, T beta gamma-MEKA complex was recovered in the aqueous phase, whereas T beta gamma was recover in the detergent phase. N-terminal portion of MEKA which includes T beta gamma-binding domain was not sufficient to reduce the hydrophobicity of T beta gamma or to dissociate T beta gamma from the membrane. The data suggest that MEKA attenuates the hydrophobicity of T beta gamma to result in the dissociation of T beta gamma from the membrane without directly binding to farnesyl/carboxyl-methyl moieties.

authors

Tanaka H,Kuo CH,Matsuda T,Fukada Y,Hayashi F,Ding Y,Irie Y,Miki N

doi

10.1006/bbrc.1996.0939

subject

Has Abstract

pub_date

1996-06-25 00:00:00

pages

587-91

issue

3

eissn

0006-291X

issn

1090-2104

pii

S0006-291X(96)90939-0

journal_volume

223

pub_type

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