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1wcr
From Proteopedia
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[[Image:1wcr.gif|left|200px]] | [[Image:1wcr.gif|left|200px]] | ||
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'''TRIMERIC STRUCTURE OF THE ENZYME IIA FROM ESCHERICHIA COLI PHOSPHOTRANSFERASE SYSTEM SPECIFIC FOR N,N'-DIACETYLCHITOBIOSE''' | '''TRIMERIC STRUCTURE OF THE ENZYME IIA FROM ESCHERICHIA COLI PHOSPHOTRANSFERASE SYSTEM SPECIFIC FOR N,N'-DIACETYLCHITOBIOSE''' | ||
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Solution structure of enzyme IIA(Chitobiose) from the N,N'-diacetylchitobiose branch of the Escherichia coli phosphotransferase system., Tang C, Williams DC Jr, Ghirlando R, Clore GM, J Biol Chem. 2005 Mar 25;280(12):11770-80. Epub 2005 Jan 14. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/15654077 15654077] | Solution structure of enzyme IIA(Chitobiose) from the N,N'-diacetylchitobiose branch of the Escherichia coli phosphotransferase system., Tang C, Williams DC Jr, Ghirlando R, Clore GM, J Biol Chem. 2005 Mar 25;280(12):11770-80. Epub 2005 Jan 14. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/15654077 15654077] | ||
[[Category: Escherichia coli]] | [[Category: Escherichia coli]] | ||
| - | [[Category: Protein-N(pi)-phosphohistidine--sugar phosphotransferase]] | ||
[[Category: Single protein]] | [[Category: Single protein]] | ||
[[Category: Clore, G M.]] | [[Category: Clore, G M.]] | ||
[[Category: Tang, C.]] | [[Category: Tang, C.]] | ||
| - | [[Category: | + | [[Category: Iia]] |
| - | [[Category: | + | [[Category: Mutagenesis,chitobiose]] |
| - | [[Category: | + | [[Category: Phosphotransferase]] |
| - | [[Category: | + | [[Category: Pt]] |
| - | [[Category: | + | [[Category: Sugar transport]] |
| - | [[Category: | + | [[Category: Transferase]] |
| - | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 13:28:36 2008'' | |
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on | + | |
Revision as of 10:28, 3 May 2008
TRIMERIC STRUCTURE OF THE ENZYME IIA FROM ESCHERICHIA COLI PHOSPHOTRANSFERASE SYSTEM SPECIFIC FOR N,N'-DIACETYLCHITOBIOSE
Overview
The solution structure of trimeric Escherichia coli enzyme IIA(Chb) (34 kDa), a component of the N,N'-diacetylchitobiose/lactose branch of the phosphotransferase signal transduction system, has been determined by NMR spectroscopy. Backbone residual dipolar couplings were used to provide long range orientational restraints, and long range (|i - j| > or = 5 residues) nuclear Overhauser enhancement restraints were derived exclusively from samples in which at least one subunit was 15N/13C/2H/(Val-Leu-Ile)-methyl-protonated. Each subunit consists of a three-helix bundle. Hydrophobic residues lining helix 3 of each subunit are largely responsible for the formation of a parallel coiled-coil trimer. The active site histidines (His-89 from each subunit) are located in three symmetrically placed deep crevices located at the interface of two adjacent subunits (A and C, C and B, and B and A). Partially shielded from bulk solvent, structural modeling suggests that phosphorylated His-89 is stabilized by electrostatic interactions with the side chains of His-93 from the same subunit and Gln-91 from the adjacent subunit. Comparison with the x-ray structure of Lactobacillus lactis IIA(Lac) reveals some substantial structural differences, particularly in regard to helix 3, which exhibits a 40 degrees kink in IIA(Lac) versus a 7 degrees bend in IIA(Chb). This is associated with the presence of an unusually large (230-angstroms3) buried hydrophobic cavity at the trimer interface in IIA(Lac) that is reduced to only 45 angstroms3) in IIA(Chb).
About this Structure
1WCR is a Single protein structure of sequence from Escherichia coli. Full crystallographic information is available from OCA.
Reference
Solution structure of enzyme IIA(Chitobiose) from the N,N'-diacetylchitobiose branch of the Escherichia coli phosphotransferase system., Tang C, Williams DC Jr, Ghirlando R, Clore GM, J Biol Chem. 2005 Mar 25;280(12):11770-80. Epub 2005 Jan 14. PMID:15654077 Page seeded by OCA on Sat May 3 13:28:36 2008
