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2qeb

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{{STRUCTURE_2qeb| PDB=2qeb | SCENE= }}
{{STRUCTURE_2qeb| PDB=2qeb | SCENE= }}
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'''Crystal Structure of Anopheles Gambiae D7R4-Histamine Complex'''
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===Crystal Structure of Anopheles Gambiae D7R4-Histamine Complex===
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==Overview==
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The D7-related (D7r) proteins of the malaria vector Anopheles gambiae have been shown to bind the biogenic amines serotonin, norepinephrine, and histamine with high affinity. One member of the group (D7r1 or hamadarin) has also been shown to have an anticoagulant/antikinin activity. To understand the mechanistic details of its antihemostatic/anti-inflammatory effects, we have determined the crystal structure of one member of this group, D7r4, along with the structures of ligand complexes with serotonin, tryptamine, histamine, and norepinephrine. The D7 fold consists of an arrangement of eight alpha-helices stabilized by three disulfide bonds. The structure is similar to those of the arthropod odorant-binding proteins, a relationship that had been predicted based on sequence comparisons. Although odorant-binding proteins commonly have six alpha-helices, D7r4 has eight, resulting in significantly different positioning and structure of the ligand binding pocket. The pocket itself is lined by hydrophobic side chains along with polar and charged groups oriented to form hydrogen bonds with the aliphatic amino group and with groups on the aromatic portions of the ligands. These structures, along with accompanying mutagenesis studies, have allowed us to identify critical residues for biogenic amine binding and to predict which members of the large D7 protein family found in blood-feeding nematocerous Diptera will function as biogenic amine-binding proteins.
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(as it appears on PubMed at http://www.pubmed.gov), where 17928288 is the PubMed ID number.
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{{ABSTRACT_PUBMED_17928288}}
==About this Structure==
==About this Structure==
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[[Category: Ligand binding protein]]
[[Category: Ligand binding protein]]
[[Category: Odorant-binding protein]]
[[Category: Odorant-binding protein]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun May 4 14:48:33 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jul 28 08:55:47 2008''

Revision as of 05:55, 28 July 2008

Image:2qeb.png

Template:STRUCTURE 2qeb

Crystal Structure of Anopheles Gambiae D7R4-Histamine Complex

Template:ABSTRACT PUBMED 17928288

About this Structure

2QEB is a Single protein structure of sequence from Anopheles gambiae. Full crystallographic information is available from OCA.

Reference

The crystal structure of D7r4, a salivary biogenic amine-binding protein from the malaria mosquito Anopheles gambiae., Mans BJ, Calvo E, Ribeiro JM, Andersen JF, J Biol Chem. 2007 Dec 14;282(50):36626-33. Epub 2007 Oct 9. PMID:17928288

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