Kinetics of lipid-membrane binding and conformational change of L-BABP.

Abstract:

:We designed an experimental approach to differentiate the kinetics of protein binding to a lipid membrane from the kinetics of the associated conformational change in the protein. We measured the fluorescence intensity of the single Trp6 in chicken liver bile acid-binding protein (L-BABP) as a function of time after mixing the protein with lipid membranes. We mixed the protein with pure lipid membranes, with lipid membranes in the presence of a soluble quencher, and with lipid membranes containing a fluorescence quencher attached to the lipid polar head group. We fitted simultaneously the experimental curves to a three-state kinetic model. We conclude that in a first step, the binding of L-BABP to the interfacial region of the anionic lipid polar head groups occurred simultaneously with a conformational change to the partly unfolded state. In a second slower step, Trp6 buried within the polar head group region, releasing contacts with the aqueous phase.

authors

Galassi V,Nolan V,Villarreal MA,Perduca M,Monaco HL,Montich GG

doi

10.1016/j.bbrc.2009.03.103

subject

Has Abstract

pub_date

2009-05-15 00:00:00

pages

771-5

issue

4

eissn

0006-291X

issn

1090-2104

pii

S0006-291X(09)00595-6

journal_volume

382

pub_type

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