1hzo: Difference between revisions

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[[Image:1hzo.jpg|left|200px]]
{{Seed}}
[[Image:1hzo.png|left|200px]]


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{{STRUCTURE_1hzo|  PDB=1hzo  |  SCENE=  }}  
{{STRUCTURE_1hzo|  PDB=1hzo  |  SCENE=  }}  


'''STRUCTURE OF CLASS A CEPHALOSPORINASE FROM PROTEUS VULGARIS K1'''
===STRUCTURE OF CLASS A CEPHALOSPORINASE FROM PROTEUS VULGARIS K1===




==Overview==
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The structure of a chromosomal extended-spectrum beta-lactamase (ESBL) having the ability to hydrolyze cephalosporins including cefuroxime and ceftazidime has been determined by X-ray crystallography to 1.75 A resolution. The species-specific class A beta-lactamase from Proteus vulgaris K1 was crystallized at pH 6.25 and its structure solved by molecular replacement. Refinement of the model resulted in crystallographic R and R(free) of 16.9 % and 19.3 %, respectively. The folding of the K1 enzyme is broadly similar to that of non-ESBL TEM-type beta-lactamases (2 A rmsd for C(alpha)) and differs by only 0.35 A for all atoms of six conserved residues in the catalytic site. Other residues promoting extended-spectrum activity in K1 include the side-chains of atypical residues Ser237 and Lys276. These side-chains are linked by two water molecules, one of which lies in the position normally filled by the guanidinium group of Arg244, present in most non-ESBL enzymes but absent from K1. The ammonium group of Lys276, ca 3.5 A from the virtual Arg244 guanidinium position, may interact with polar R2 substitutents on the dihydrothiazene ring of cephalosporins.
The line below this paragraph, {{ABSTRACT_PUBMED_11916382}}, adds the Publication Abstract to the page
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{{ABSTRACT_PUBMED_11916382}}


==About this Structure==
==About this Structure==
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[[Category: Hydrolase]]
[[Category: Hydrolase]]
[[Category: Mixed alpha/beta]]
[[Category: Mixed alpha/beta]]
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May 2 19:24:14 2008''
 
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 1 10:11:29 2008''

Revision as of 07:11, 1 July 2008

File:1hzo.png

Template:STRUCTURE 1hzo

STRUCTURE OF CLASS A CEPHALOSPORINASE FROM PROTEUS VULGARIS K1

Template:ABSTRACT PUBMED 11916382

About this Structure

1HZO is a Single protein structure of sequence from Proteus vulgaris. Full crystallographic information is available from OCA.

Reference

Structure of an extended-spectrum class A beta-lactamase from Proteus vulgaris K1., Nukaga M, Mayama K, Crichlow GV, Knox JR, J Mol Biol. 2002 Mar 15;317(1):109-17. PMID:11916382

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