2fhx
From Proteopedia
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| - | [[Image:2fhx.gif|left|200px]] | + | [[Image:2fhx.gif|left|200px]] |
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| - | '''Pseudomonas aeruginosa SPM-1 metallo-beta-lactamase''' | + | {{Structure |
| + | |PDB= 2fhx |SIZE=350|CAPTION= <scene name='initialview01'>2fhx</scene>, resolution 1.900Å | ||
| + | |SITE= | ||
| + | |LIGAND= <scene name='pdbligand=ZN:ZINC+ION'>ZN</scene>, <scene name='pdbligand=AZI:AZIDE+ION'>AZI</scene>, <scene name='pdbligand=CL:CHLORIDE+ION'>CL</scene> and <scene name='pdbligand=EDO:1,2-ETHANEDIOL'>EDO</scene> | ||
| + | |ACTIVITY= [http://en.wikipedia.org/wiki/Beta-lactamase Beta-lactamase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.5.2.6 3.5.2.6] | ||
| + | |GENE= blaSPM-1 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=287 Pseudomonas aeruginosa]) | ||
| + | }} | ||
| + | |||
| + | '''Pseudomonas aeruginosa SPM-1 metallo-beta-lactamase''' | ||
| + | |||
==Overview== | ==Overview== | ||
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==About this Structure== | ==About this Structure== | ||
| - | 2FHX is a [ | + | 2FHX is a [[Protein complex]] structure of sequences from [http://en.wikipedia.org/wiki/Pseudomonas_aeruginosa Pseudomonas aeruginosa]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2FHX OCA]. |
==Reference== | ==Reference== | ||
| - | Crystal structure of Pseudomonas aeruginosa SPM-1 provides insights into variable zinc affinity of metallo-beta-lactamases., Murphy TA, Catto LE, Halford SE, Hadfield AT, Minor W, Walsh TR, Spencer J, J Mol Biol. 2006 Mar 31;357(3):890-903. Epub 2006 Jan 23. PMID:[http:// | + | Crystal structure of Pseudomonas aeruginosa SPM-1 provides insights into variable zinc affinity of metallo-beta-lactamases., Murphy TA, Catto LE, Halford SE, Hadfield AT, Minor W, Walsh TR, Spencer J, J Mol Biol. 2006 Mar 31;357(3):890-903. Epub 2006 Jan 23. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/16460758 16460758] |
[[Category: Beta-lactamase]] | [[Category: Beta-lactamase]] | ||
[[Category: Protein complex]] | [[Category: Protein complex]] | ||
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[[Category: structure]] | [[Category: structure]] | ||
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Mar 20 16:52:37 2008'' |
Revision as of 14:52, 20 March 2008
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| , resolution 1.900Å | |||||||
|---|---|---|---|---|---|---|---|
| Ligands: | , , and | ||||||
| Gene: | blaSPM-1 (Pseudomonas aeruginosa) | ||||||
| Activity: | Beta-lactamase, with EC number 3.5.2.6 | ||||||
| Coordinates: | save as pdb, mmCIF, xml | ||||||
Pseudomonas aeruginosa SPM-1 metallo-beta-lactamase
Overview
Metallo-beta-lactamases (mbetals) confer broad-spectrum resistance to beta-lactam antibiotics upon host bacteria and escape the action of existing beta-lactamase inhibitors. SPM-1 is a recently discovered mbetal that is distinguished from related enzymes by possession of a substantial central insertion and by sequence variation at positions that maintain active site structure. Biochemical data show SPM-1 to contain two Zn2+ sites of differing affinities, a phenomenon that is well documented amongst mbetals but for which a structural explanation has proved elusive. Here, we report the crystal structure of SPM-1 to 1.9 A resolution. The structure reveals SPM-1 to lack a mobile loop implicated in substrate binding by related mbetals and to accommodate the central insertion in an extended helical interdomain region. Deleting this had marginal effect upon binding and hydrolysis of a range of beta-lactams. These data suggest that the interactions of SPM-1 with substrates differ from those employed by other mbetals. SPM-1 as crystallised contains a single Zn2+. Both the active site hydrogen-bonding network and main-chain geometry at Asp120, a key component of the binding site for the second zinc ion, differ significantly from previous mbetal structures. We propose that variable interactions made by the Asp120 carbonyl group modulate affinity for a second Zn2+ equivalent in mbetals of the B1 subfamily. We further predict that SPM-1 possesses the capacity to evolve variants of enhanced catalytic activity by point mutations altering geometry and hydrogen bonding in the vicinity of the second Zn2+ site.
About this Structure
2FHX is a Protein complex structure of sequences from Pseudomonas aeruginosa. Full crystallographic information is available from OCA.
Reference
Crystal structure of Pseudomonas aeruginosa SPM-1 provides insights into variable zinc affinity of metallo-beta-lactamases., Murphy TA, Catto LE, Halford SE, Hadfield AT, Minor W, Walsh TR, Spencer J, J Mol Biol. 2006 Mar 31;357(3):890-903. Epub 2006 Jan 23. PMID:16460758
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