1mdq
From Proteopedia
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'''REFINED STRUCTURES OF TWO INSERTION(SLASH)DELETION MUTANTS PROBE FUNCTION OF THE MALTODEXTRIN BINDING PROTEIN''' | '''REFINED STRUCTURES OF TWO INSERTION(SLASH)DELETION MUTANTS PROBE FUNCTION OF THE MALTODEXTRIN BINDING PROTEIN''' | ||
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[[Category: Quiocho, F A.]] | [[Category: Quiocho, F A.]] | ||
[[Category: Sharff, A J.]] | [[Category: Sharff, A J.]] | ||
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| - | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 00:55:16 2008'' | |
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on | + | |
Revision as of 21:55, 2 May 2008
REFINED STRUCTURES OF TWO INSERTION(SLASH)DELETION MUTANTS PROBE FUNCTION OF THE MALTODEXTRIN BINDING PROTEIN
Overview
The X-ray structures of the maltose bound forms of two insertion/deletion mutants of the Escherichia coli maltodextrin binding protein, MalE322 and MalE178, have been determined and refined. MalE322 involves a one residue deletion, two residue insertion in a hinge segment connecting the two (N and C) domains of the protein, an area already identified as being critical for the correct functioning of the protein. MalE178 involves a nine residue deletion and two residue insertion in a helix at the periphery of the C-domain. The function of both mutant proteins is similar to the wild-type, although MalE322 increases the ability to transport maltose and maltodextrin whilst inhibiting the ability of the cell to grow on dextrins. Both proteins exhibit very localized and conservative conformational changes due to their mutations. The structure of MalE322 shows some deformation of the third hinge strand, indicating the likely cause of change in its biochemistry. MalE178 is stable and its activity virtually unchanged from the wild-type. This is most likely due to the long distance of the mutation from the binding site and conservation of the number of interactions between the area around the deletion site and the main body of the protein.
About this Structure
1MDQ is a Single protein structure of sequence from Escherichia coli. Full crystallographic information is available from OCA.
Reference
Refined structures of two insertion/deletion mutants probe function of the maltodextrin binding protein., Sharff AJ, Rodseth LE, Szmelcman S, Hofnung M, Quiocho FA, J Mol Biol. 1995 Feb 10;246(1):8-13. PMID:7853407 Page seeded by OCA on Sat May 3 00:55:16 2008
