1mpb

<table><tr><td colspan='2'>[[1mpb]] is a 1 chain structure with sequence from [http://en.wikipedia.org/wiki/Ecoli Ecoli]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1MPB OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1MPB FirstGlance]. <br>

</td></tr><tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1mpb FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1mpb OCA], [http://pdbe.org/1mpb PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=1mpb RCSB], [http://www.ebi.ac.uk/pdbsum/1mpb PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=1mpb ProSAT]</span></td></tr>

[[http://www.uniprot.org/uniprot/MALE_ECOLI MALE_ECOLI]] Involved in the high-affinity maltose membrane transport system MalEFGK. Initial receptor for the active transport of and chemotaxis toward maltooligosaccharides.

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== Publication Abstract from PubMed ==

A mutant of the periplasmic maltose-binding protein (MBP) with altered transport properties was studied. A change of residue 230 from tryptophan to arginine results in dominant-negative MBP: expression of this protein against a wild-type background causes inhibition of maltose transport. As part of an investigation of the mechanism of such inhibition, we have solved crystal structures of both unliganded and liganded mutant protein. In the closed, liganded conformation, the side-chain of R230 projects into a region of the surface of MBP that has been identified as important for transport while in the open form, the same side-chain takes on a different, and less ordered, conformation. The crystallographic work is supplemented with a small-angle X-ray scattering study that provides evidence that the solution conformation of unliganded mutant is similar to that of wild-type MBP. It is concluded that dominant-negative inhibition of maltose transport must result from the formation of a non-productive complex between liganded-bound mutant MBP and wild-type MalFGK2. A general kinetic framework for transport by either wild-type MalFGK2 or MBP-independent MalFGK2 is used to understand the effects of dominant-negative MBP molecules on both of these systems.

Crystal structures and solution conformations of a dominant-negative mutant of Escherichia coli maltose-binding protein.,Shilton BH, Shuman HA, Mowbray SL J Mol Biol. 1996 Nov 29;264(2):364-76. PMID:8951382<ref>PMID:8951382</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>

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== References ==

<references/>

[[Category: Ecoli]]

[[Category: Mowbray, S L]]

[[Category: Shilton, B H]]

[[Category: Periplasmic binding protein]]