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| | {{STRUCTURE_1fqb| PDB=1fqb | SCENE= }} | | {{STRUCTURE_1fqb| PDB=1fqb | SCENE= }} |
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| - | '''STRUCTURE OF MALTOTRIOTOL BOUND TO OPEN-FORM MALTODEXTRIN BINDING PROTEIN IN P2(1)CRYSTAL FORM'''
| + | ===STRUCTURE OF MALTOTRIOTOL BOUND TO OPEN-FORM MALTODEXTRIN BINDING PROTEIN IN P2(1)CRYSTAL FORM=== |
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| - | ==Overview==
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| - | The structure of the maltodextrin or maltose-binding protein, an initial receptor for bacterial ABC-type active transport and chemotaxis, consists of two globular domains that are separated by a groove wherein the ligand is bound and enclosed by an inter-domain rotation. Here, we report the determination of the crystal structures of the protein complexed with reduced maltooligosaccharides (maltotriitol and maltotetraitol) in both the "closed" and "open" forms. Although these modified sugars bind to the receptor, they are not transported by the wild-type transporter. In the closed structures, the reduced sugars are buried in the groove and bound by both domains, one domain mainly by hydrogen-bonding interactions and the other domain primarily by non-polar interactions with aromatic side-chains. In the open structures, which abrogate both cellular activities of active transport and chemotaxis because of the large separation between the two domains, the sugars are bound almost exclusively to the domain rich in aromatic residues. The binding site for the open chain glucitol residue extends to a subsite that is distinct from those for the glucose residues that were uncovered in prior structural studies of the binding of active linear maltooligosaccharides. Occupation of this subsite may also account for the inability of the reduced oligosaccharides to be transported. The structures reported here, combined with those previously determined for several other complexes with active oligosaccharides in the closed form and with cyclodextrin in the open form, revealed at least four distinct modes of ligand binding but with only one being functionally active. This versatility reflects the flexibility of the protein, from very large motions of interdomain rotation to more localized side-chain conformational changes, and adaptation by the oligosaccharides as well. | + | The line below this paragraph, {{ABSTRACT_PUBMED_11237621}}, adds the Publication Abstract to the page |
| | + | (as it appears on PubMed at http://www.pubmed.gov), where 11237621 is the PubMed ID number. |
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| | + | {{ABSTRACT_PUBMED_11237621}} |
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| | ==About this Structure== | | ==About this Structure== |
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| | [[Category: Maltotriotal]] | | [[Category: Maltotriotal]] |
| | [[Category: Sugar-binding protein]] | | [[Category: Sugar-binding protein]] |
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May 2 16:38:26 2008'' | + | |
| | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 1 03:46:46 2008'' |
Revision as of 00:46, 1 July 2008
Template:STRUCTURE 1fqb
STRUCTURE OF MALTOTRIOTOL BOUND TO OPEN-FORM MALTODEXTRIN BINDING PROTEIN IN P2(1)CRYSTAL FORM
Template:ABSTRACT PUBMED 11237621
About this Structure
1FQB is a Single protein structure of sequence from Escherichia coli. Full crystallographic information is available from OCA.
Reference
Crystal structures of the maltodextrin/maltose-binding protein complexed with reduced oligosaccharides: flexibility of tertiary structure and ligand binding., Duan X, Hall JA, Nikaido H, Quiocho FA, J Mol Biol. 2001 Mar 9;306(5):1115-26. PMID:11237621
Page seeded by OCA on Tue Jul 1 03:46:46 2008
