Protein transport via the cpTat pathway displays cooperativity and is stimulated by transport-incompetent substrate.

Abstract:

:Kinetic analyses of cpTat-mediated protein transport across the thylakoid membrane were conducted, revealing three important characteristics of this translocation pathway. First, transport via the cpTAT system displays a non-Michaelis-Menten, sigmoidal rate-substrate relationship with an apparent Hill coefficient of 1.80, indicative of positive homotropic cooperativity. Second, the presence of transport-incompetent substrates was found not to competitively inhibit the translocation of transport-competent substrates. However, the presence of low concentrations of transport-incompetent protein enhances the transport of wild type substrate. Together, these findings suggest that interaction between Tat machinery components and both transport-competent and transport-incompetent protein may elicit a cooperative effect on the translocation rate.

journal_name

FEBS Lett

journal_title

FEBS letters

authors

Alder NN,Theg SM

doi

10.1016/s0014-5793(03)00231-x

keywords:

subject

Has Abstract

pub_date

2003-04-10 00:00:00

pages

96-100

issue

1-3

eissn

0014-5793

issn

1873-3468

pii

S001457930300231X

journal_volume

540

pub_type

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