Tinkering with Transporters: Periplasmic Binding Protein-dependent Maltose Transport in E. Coli

Overview

Journal J Bioenerg Biomembr

Publisher Springer

Specialties Biochemistry
Biology
Endocrinology

Date 1993 Dec 1

PMID 7511584

Citations 7

Authors

H A Shuman

C H Panagiotidis

Affiliations

Soon will be listed here.

Abstract

Periplasmic binding protein-dependent transport systems represent a common mechanism for nutrient and ion uptake in bacteria. As a group, these systems are related to one another and to other transporters of both prokaryotes and eukaryotes, based on sequence similarity within an ATP-binding subunit and overall structural organization. These transporters probably all use energy derived from ATP to pump substrates across membranes. Although there is considerable information about the sequences and identity of the transporters, there is little information about how they work. That is, where do ligands bind? Where do the subunits or domains interact with one another? How is the energy of nucleotide binding and/or hydrolysis converted to conformational changes? In order to address these questions we have taken a genetic approach that involves studying mutant forms of a transporter. Rather than study mutations that result in complete loss of function, the study of mutations which perturb or alter the normal function of the transporter in a defined manner has provided a limited insight into how the answers to these questions may be obtained.

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Exploring the role of integral membrane proteins in ATP-binding cassette transporters: analysis of a collection of MalG insertion mutants.

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