1k25: Difference between revisions

Revision as of 21:24, 1 July 2008

This article has been automatically seeded. Changes to this page should pertain to the PDB entry only and not to the protein or biomolecule in general.

File:1k25.png

Template:STRUCTURE 1k25

PBP2x from a Highly Penicillin-resistant Streptococcus pneumoniae Clinical IsolatePBP2x from a Highly Penicillin-resistant Streptococcus pneumoniae Clinical Isolate

Template:ABSTRACT PUBMED 11553637

About this StructureAbout this Structure

1K25 is a Single protein structure of sequence from Streptococcus pneumoniae. Full crystallographic information is available from OCA.

ReferenceReference

Crystal structure of PBP2x from a highly penicillin-resistant Streptococcus pneumoniae clinical isolate: a mosaic framework containing 83 mutations., Dessen A, Mouz N, Gordon E, Hopkins J, Dideberg O, J Biol Chem. 2001 Nov 30;276(48):45106-12. Epub 2001 Sep 11. PMID:11553637

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Proteopedia Page Contributors and Editors (what is this?)Proteopedia Page Contributors and Editors (what is this?)

OCA

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-'''PBP2x from a Highly Penicillin-resistant Streptococcus pneumoniae Clinical Isolate'''
+===PBP2x from a Highly Penicillin-resistant Streptococcus pneumoniae Clinical Isolate===
-==Overview==
+<!--
-Penicillin-binding proteins (PBPs) are the main targets for beta-lactam antibiotics, such as penicillins and cephalosporins, in a wide range of bacterial species. In some Gram-positive strains, the surge of resistance to treatment with beta-lactams is primarily the result of the proliferation of mosaic PBP-encoding genes, which encode novel proteins by recombination. PBP2x is a primary resistance determinant in Streptococcus pneumoniae, and its modification is an essential step in the development of high level beta-lactam resistance. To understand such a resistance mechanism at an atomic level, we have solved the x-ray crystal structure of PBP2x from a highly penicillin-resistant clinical isolate of S. pneumoniae, Sp328, which harbors 83 mutations in the soluble region. In the proximity of the Sp328 PBP2x* active site, the Thr(338) --&gt; Ala mutation weakens the local hydrogen bonding network, thus abrogating the stabilization of a crucial buried water molecule. In addition, the Ser(389) --&gt; Leu and Asn(514) --&gt; His mutations produce a destabilizing effect that generates an "open" active site. It has been suggested that peptidoglycan substrates for beta-lactam-resistant PBPs contain a large amount of abnormal, branched peptides, whereas sensitive strains tend to catalyze cross-linking of linear forms. Thus, in vivo, an "open" active site could facilitate the recognition of distinct, branched physiological substrates.
+The line below this paragraph, {{ABSTRACT_PUBMED_11553637}}, adds the Publication Abstract to the page
+(as it appears on PubMed at http://www.pubmed.gov), where 11553637 is the PubMed ID number.
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+{{ABSTRACT_PUBMED_11553637}}
 ==About this Structure==
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 [[Category: Clinical mutant]]
 [[Category: Low-affinity penicillin-binding]]
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