1h9c: Difference between revisions

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[[Image:1h9c.gif|left|200px]]
{{Seed}}
[[Image:1h9c.png|left|200px]]


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{{STRUCTURE_1h9c|  PDB=1h9c  |  SCENE=  }}  
{{STRUCTURE_1h9c|  PDB=1h9c  |  SCENE=  }}  


'''NMR STRUCTURE OF CYSTEINYL-PHOSPHORYLATED ENZYME IIB OF THE N,N'-DIACETYLCHITOBIOSE SPECIFIC PHOSPHOENOLPYRUVATE-DEPENDENT PHOSPHOTRANSFERASE SYSTEM OF ESCHERICHIA COLI.'''
===NMR STRUCTURE OF CYSTEINYL-PHOSPHORYLATED ENZYME IIB OF THE N,N'-DIACETYLCHITOBIOSE SPECIFIC PHOSPHOENOLPYRUVATE-DEPENDENT PHOSPHOTRANSFERASE SYSTEM OF ESCHERICHIA COLI.===




==Overview==
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The determination by NMR of the solution structure of the phosphorylated enzyme IIB (P-IIB(Chb)) of the N,N'-diacetylchitobiose-specific phosphoenolpyruvate-dependent phosphotransferase system of Escherichia coli is presented. Most of the backbone and side-chain resonances were assigned using a variety of mostly heteronuclear NMR experiments. The remaining resonances were assigned with the help of the structure calculations.NOE-derived distance restraints were used in distance geometry calculations followed by molecular dynamics and simulated annealing protocols. In addition, combinations of ambiguous restraints were used to resolve ambiguities in the NOE assignments. By combining sets of ambiguous and unambiguous restraints into new ambiguous restraints, an error function was constructed that was less sensitive to information loss caused by assignment uncertainties. The final set of structures had a pairwise rmsd of 0.59 A and 1.16 A for the heavy atoms of the backbone and side-chains, respectively.Comparing the P-IIB(Chb) solution structure with the previously determined NMR and X-ray structures of the wild-type and the Cys10Ser mutant shows that significant differences between the structures are limited to the active-site region. The phosphoryl group at the active-site cysteine residue is surrounded by a loop formed by residues 10 through 16. NOE and chemical shift data suggest that the phosphoryl group makes hydrogen bonds with the backbone amide protons of residues 12 and 15. The binding mode of the phosphoryl group is very similar to that of the protein tyrosine phosphatases. The differences observed are in accordance with the presumption that IIB(Chb) has to be more resistant to hydrolysis than the protein tyrosine phosphatases. We propose a proton relay network by which a transfer occurs between the cysteine SH proton and the solvent via the hydroxyl group of Thr16.
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{{ABSTRACT_PUBMED_11352587}}


==About this Structure==
==About this Structure==
1H9C is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1H9C OCA].  
1H9C is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli]. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1H9C OCA].  


==Reference==
==Reference==
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[[Category: Sugar transport]]
[[Category: Sugar transport]]
[[Category: Transferase]]
[[Category: Transferase]]
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May 2 18:35:57 2008''
 
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 1 07:48:47 2008''

Revision as of 04:48, 1 July 2008

File:1h9c.png

Template:STRUCTURE 1h9c

NMR STRUCTURE OF CYSTEINYL-PHOSPHORYLATED ENZYME IIB OF THE N,N'-DIACETYLCHITOBIOSE SPECIFIC PHOSPHOENOLPYRUVATE-DEPENDENT PHOSPHOTRANSFERASE SYSTEM OF ESCHERICHIA COLI.

Template:ABSTRACT PUBMED 11352587

About this Structure

1H9C is a Single protein structure of sequence from Escherichia coli. Full experimental information is available from OCA.

Reference

NMR structure of cysteinyl-phosphorylated enzyme IIB of the N,N'-diacetylchitobiose-specific phosphoenolpyruvate-dependent phosphotransferase system of Escherichia coli., Ab E, Schuurman-Wolters GK, Nijlant D, Dijkstra K, Saier MH, Robillard GT, Scheek RM, J Mol Biol. 2001 May 18;308(5):993-1009. PMID:11352587

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