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Licensed Unlicensed Requires Authentication Published by De Gruyter November 19, 2016

The novel class of seven transmembrane segment inverted repeat carriers

Yung-Ning Chang and Eric R. Geertsma
From the journal Biological Chemistry

Abstract

Solute carriers from the SLC4, SLC23, and SLC26 families are involved in pH regulation, vitamin C transport and ion homeostasis. While these families do not share any obvious sequence relationship, they are united by their unique and novel architecture. Each member of this structural class is organized into two structurally related halves of seven transmembrane segments each. These halves span the membrane with opposite orientations and form an intricately intertwined structure of two inverted repeats. This review highlights the general design principles of this fold and reveals the diversity between the different families. We discuss their domain architecture, structural framework and transport mode and detail an initial transport mechanism for this fold inferred from the recently solved structures of different members.

Acknowledgments

We thank Benedikt Kuhn and Katharina Holzhüter for critical reading and helpful discussions. E.R.G. acknowledges funding from the German Research Foundation through the Cluster of Excellence Frankfurt ‘Macromolecular Complexes’, and the CRC807 ‘Transport and Communication across Biological Membranes’.

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Received: 2016-7-18
Accepted: 2016-11-16
Published Online: 2016-11-19
Published in Print: 2017-2-1

©2017 Walter de Gruyter GmbH, Berlin/Boston

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