Becker, Markus, Maximov, Stanislav, Becker, Michael, Meyer, Ute, Wittmann, Anja and Kraemer, Reinhard (2014). Analysis of putative protomer crosstalk in the trimeric transporter BetP: The heterotrimer approach. Biochim. Biophys. Acta-Bioenerg., 1837 (6). S. 888 - 899. AMSTERDAM: ELSEVIER. ISSN 1879-2650

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Abstract

The homotrimeric, secondary active betaine carrier BetP from Corynebacterium glutamicum is a model system for stress-regulated transport in bacteria. Its activity responds to hyperosmotic stress and it harbors two different functions, transport catalysis (betaine uptake) and stimulus sensing, resp. activity regulation. Structural information from 2D and 3D crystals as well as functional analysis of monomerized BetP suggested the presence of conformational crosstalk between the individual protomers. To study whether the oligomeric state is functionally significant on a mechanistic level we generated heterooligomeric complexes of BetP in which single protomers within the trimer can be addressed. By testing dominant negative effects in a trimer of one active protomer combined with two protomers in which transport and regulation were abolished, we provide experimental evidence for the absence of functionally significant conformational crosstalk between the protomers on the level of both transport and regulation. This is supported by experiments using mutant forms of putative interacting signal donor and acceptor domains of individual BetP protomers. This result has important consequences for oligomeric transport proteins in general and BetP in particular. (C) 2014 Elsevier B.V. All rights reserved.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Becker, MarkusUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Maximov, StanislavUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Becker, MichaelUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Meyer, UteUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Wittmann, AnjaUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Kraemer, ReinhardUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
URN: urn:nbn:de:hbz:38-436908
DOI: 10.1016/j.bbabio.2014.03.002
Journal or Publication Title: Biochim. Biophys. Acta-Bioenerg.
Volume: 1837
Number: 6
Page Range: S. 888 - 899
Date: 2014
Publisher: ELSEVIER
Place of Publication: AMSTERDAM
ISSN: 1879-2650
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
BETAINE CARRIER BETP; CORYNEBACTERIUM-GLUTAMICUM; CRYSTAL-STRUCTURE; MULTIDRUG TRANSPORTER; MECHANISM; SYSTEM; SPECIFICITY; SUBSTRATE; MEMBRANE; HOMOLOGMultiple languages
Biochemistry & Molecular Biology; BiophysicsMultiple languages
URI: http://kups.ub.uni-koeln.de/id/eprint/43690

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