1z76

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[[Image:1z76.gif|left|200px]]
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{{Seed}}
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[[Image:1z76.png|left|200px]]
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{{STRUCTURE_1z76| PDB=1z76 | SCENE= }}
{{STRUCTURE_1z76| PDB=1z76 | SCENE= }}
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'''Crystal structure of an acidic phospholipase A2 (BthA-I) from Bothrops jararacussu venom complexed with p-bromophenacyl bromide'''
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===Crystal structure of an acidic phospholipase A2 (BthA-I) from Bothrops jararacussu venom complexed with p-bromophenacyl bromide===
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==Overview==
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The crystal structure of an acidic phospholipase A(2) isolated from Bothrops jararacussu venom (BthA-I) chemically modified with p-bromophenacyl bromide (BPB) has been determined at 1.85 Angstroms resolution. The catalytic, platelet-aggregation inhibition, anticoagulant and hypotensive activities of BthA-I are abolished by ligand binding. Electron-density maps permitted unambiguous identification of inhibitor covalently bound to His48 in the substrate-binding cleft. The BthA-I-BPB complex contains three structural regions that are modified after inhibitor binding: the Ca(2+)-binding loop, beta-wing and C-terminal regions. Comparison of BthA-I-BPB with two other BPB-inhibited PLA(2) structures suggests that in the absence of Na(+) ions at the Ca(2+)-binding loop, this loop and other regions of the PLA(2)s undergo structural changes. The BthA-I-BPB structure reveals a novel oligomeric conformation. This conformation is more energetically and conformationally stable than the native structure and the abolition of pharmacological activities by the ligand may be related to the oligomeric structural changes. A residue of the ;pancreatic' loop (Lys69), which is usually attributed as providing the anticoagulant effect, is in the dimeric interface of BthA-I-BPB, leading to a new hypothesis regarding the abolition of this activity by BPB.
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(as it appears on PubMed at http://www.pubmed.gov), where 16301802 is the PubMed ID number.
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{{ABSTRACT_PUBMED_16301802}}
==About this Structure==
==About this Structure==
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==Reference==
==Reference==
Structure of BthA-I complexed with p-bromophenacyl bromide: possible correlations with lack of pharmacological activity., Magro AJ, Takeda AA, Soares AM, Fontes MR, Acta Crystallogr D Biol Crystallogr. 2005 Dec;61(Pt 12):1670-7. Epub 2005, Nov 19. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/16301802 16301802]
Structure of BthA-I complexed with p-bromophenacyl bromide: possible correlations with lack of pharmacological activity., Magro AJ, Takeda AA, Soares AM, Fontes MR, Acta Crystallogr D Biol Crystallogr. 2005 Dec;61(Pt 12):1670-7. Epub 2005, Nov 19. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/16301802 16301802]
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Crystallization and preliminary X-ray diffraction analysis of an acidic phospholipase A(2) complexed with p-bromophenacyl bromide and alpha-tocopherol inhibitors at 1.9- and 1.45-A resolution., Takeda AA, dos Santos JI, Marcussi S, Silveira LB, Soares AM, Fontes MR, Biochim Biophys Acta. 2004 Jun 1;1699(1-2):281-4. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/15158738 15158738]
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Crystal structure of an acidic platelet aggregation inhibitor and hypotensive phospholipase A2 in the monomeric and dimeric states: insights into its oligomeric state., Magro AJ, Murakami MT, Marcussi S, Soares AM, Arni RK, Fontes MR, Biochem Biophys Res Commun. 2004 Oct 8;323(1):24-31. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/15351695 15351695]
[[Category: Bothrops jararacussu]]
[[Category: Bothrops jararacussu]]
[[Category: Single protein]]
[[Category: Single protein]]
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[[Category: Platelet aggregation and hypotensive effect]]
[[Category: Platelet aggregation and hypotensive effect]]
[[Category: X-ray crystallography]]
[[Category: X-ray crystallography]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 17:15:45 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun Jul 27 14:28:44 2008''

Revision as of 11:28, 27 July 2008

Image:1z76.png

Template:STRUCTURE 1z76

Crystal structure of an acidic phospholipase A2 (BthA-I) from Bothrops jararacussu venom complexed with p-bromophenacyl bromide

Template:ABSTRACT PUBMED 16301802

About this Structure

1Z76 is a Single protein structure of sequence from Bothrops jararacussu. Full crystallographic information is available from OCA.

Reference

Structure of BthA-I complexed with p-bromophenacyl bromide: possible correlations with lack of pharmacological activity., Magro AJ, Takeda AA, Soares AM, Fontes MR, Acta Crystallogr D Biol Crystallogr. 2005 Dec;61(Pt 12):1670-7. Epub 2005, Nov 19. PMID:16301802

Crystallization and preliminary X-ray diffraction analysis of an acidic phospholipase A(2) complexed with p-bromophenacyl bromide and alpha-tocopherol inhibitors at 1.9- and 1.45-A resolution., Takeda AA, dos Santos JI, Marcussi S, Silveira LB, Soares AM, Fontes MR, Biochim Biophys Acta. 2004 Jun 1;1699(1-2):281-4. PMID:15158738

Crystal structure of an acidic platelet aggregation inhibitor and hypotensive phospholipase A2 in the monomeric and dimeric states: insights into its oligomeric state., Magro AJ, Murakami MT, Marcussi S, Soares AM, Arni RK, Fontes MR, Biochem Biophys Res Commun. 2004 Oct 8;323(1):24-31. PMID:15351695

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