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1xpb

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{{STRUCTURE_1xpb| PDB=1xpb | SCENE= }}
{{STRUCTURE_1xpb| PDB=1xpb | SCENE= }}
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'''STRUCTURE OF BETA-LACTAMASE TEM1'''
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===STRUCTURE OF BETA-LACTAMASE TEM1===
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==Overview==
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beta-Lactamases are bacterial enzymes which catalyse the hydrolysis of the beta-lactam ring of penicillins, cephalosporins and related compounds, thus inactivating these antibiotics. The crystal structure of the TEM1 beta-lactamase has been determined at 1.9 A resolution by the molecular-replacement method, using the atomic coordinates of two homologous beta-lactamase refined structures which show about 36% strict identity in their amino-acid sequences and 1.96 A r.m.s. deviation between equivalent Calpha atoms. The TEM1 enzyme crystallizes in space group P2(1)2(1)2(1) and there is one molecule per asymmetric unit. The structure was refined by simulated annealing to an R-factor of 15.6% for 15 086 reflections with I &gt;/= 2sigma(I) in the resolution range 5.0-1.9 A. The final crystallographic structure contains 263 amino-acid residues, one sulfate anion in the catalytic cleft and 135 water molecules per asymmetric unit. The folding is very similar to that of the other known class A beta-lactamases. It consists of two domains, the first is formed by a five-stranded beta-sheet covered by three alpha-helices on one face and one alpha-helix on the other, the second domain contains mainly alpha-helices. The catalytic cleft is located at the interface between the two domains. We also report the crystallographic study of the TEM S235A mutant. This mutation of an active-site residue specifically decreases the acylation rate of cephalosporins. This TEM S235A mutant crystallizes under the same conditions as the wild-type protein and its structure was refined at 2.0 A resolution with an R value of 17.6%. The major modification is the appearance of a water molecule near the mutated residue, which is incompatible with the OG 235 present in the wild-type enzyme, and causes very small perturbations in the interaction network in the active site.
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(as it appears on PubMed at http://www.pubmed.gov), where 15299797 is the PubMed ID number.
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{{ABSTRACT_PUBMED_15299797}}
==About this Structure==
==About this Structure==
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jul 28 02:04:46 2008''

Revision as of 23:04, 27 July 2008

Image:1xpb.png

Template:STRUCTURE 1xpb

STRUCTURE OF BETA-LACTAMASE TEM1

Template:ABSTRACT PUBMED 15299797

About this Structure

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

Reference

TEM1 beta-lactamase structure solved by molecular replacement and refined structure of the S235A mutant., Fonze E, Charlier P, To'th Y, Vermeire M, Raquet X, Dubus A, Frere JM, Acta Crystallogr D Biol Crystallogr. 1995 Sep 1;51(Pt 5):682-94. PMID:15299797

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