期刊
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
卷 128, 期 -, 页码 985-993出版社
ELSEVIER
DOI: 10.1016/j.ijbiomac.2019.02.064
关键词
Periplasmic solute-binding proteins; Chitin metabolism; Chitoligosaccharide, classification; Crystal structures; Sugar recognition; Marine bacteria
资金
- Suranaree University of Technology (SUT)
- Office of the Higher Education Commission under the National Research University (NRU) Project of Thailand [FtR.12/2558]
- Thailand Research Fund (TRF) [BRG6180011]
- Vidyasirimedhi Institute of Science and Technology (VISTEC)
- SUT grant [SUT1-102-58-36-10]
Periplasmic solute-binding proteins (SBPs) serve as molecular shuttles that assist the transport of small solutes from the outer membrane to the inner membrane of all Gram-negative bacteria. Based on the available crystal structures, SBPs are classified into seven clusters, A-G, and are further divided into subclusters, I-V. This minireview is focused on the classification, structure and substrate specificity of a distinct class of SBPs specific for chitooligosaccharides (CBPs). To date, only two structures of CBP homologues, VhCBP and VcCBP, have been reported in the marine Vibrio species, with exposition of their limited function. The Vibrio CBPs are structurally classified as cluster C/subcluster IV SBPs that exclusively recognize beta-1,4- or beta-1,3-finked linear oligosaccharides. The overall structural feature of the Vibrios CBPs is most similar to the cellobiose-binding orthologue from the hyperthermophilic bacterium Thermotoga maritime. This similarity provides an opportunity to engineer the substrate specificity of the proteins and to control the uptake of chitinous and cellulosic nutrients in marine bacteria. (C) 2019 Elsevier B.V. All rights reserved.
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