2qvd
From Proteopedia
Identification of a potent anti-inflammatory agent from the natural extract of plant Cardiospermun helicacabum: Crystal structure of the complex of phospholipase A2 with Benzo(g)-1,3-benzodioxolo(5,6-a)quinolizinium, 5,6-dihydro-9,10-dimethoxy at 1.93 A resolution
Structural highlights
FunctionPA2B8_DABRR Snake venom phospholipase A2 (PLA2) that shows weak neurotoxicity and medium anticoagulant effects by binding to factor Xa (F10) and inhibiting the prothrombinase activity (IC(50) is 130 nM) (PubMed:18062812). It also damages vital organs such as lung, liver and kidney, displays edema-inducing activities when injected into the foot pads of mice and induces necrosis of muscle cells when injected into the thigh muscle. Has a low enzymatic activity. PLA2 catalyzes the calcium-dependent hydrolysis of the 2-acyl groups in 3-sn-phosphoglycerides.[1] [2] [3] Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMedCrystal of Russell Viper venom phospholipase A(2) complexed with an isoquinoline alkaloid, berberine from a herbaceous plant Cardiospermum halicacabum, was prepared and its structure was solved by X-ray crystallography. The crystal diffracted up to 1.93A and the structure solution clearly located the position of berberine in the active site of the enzyme. Two hydrogen bonds, one direct and the other water mediated, were formed between berberine and the enzyme. Gly 30 and His 48 made these two hydrogen bonds. Additionally, the hydrophobic surface of berberine made a number of hydrophobic contacts with side chains of neighboring amino acids. Surface Plasmon Resonance studies revealed strong binding affinity between berberine and phospholipase A(2). Enzyme inhibition studies proved that berberine is a competitive inhibitor of phospholipase A(2). It was inferred that the isoquinoline alkaloid, berberine, is a potent natural inhibitor of phospholipaseA(2). Identification of a novel and potent inhibitor of phospholipase A(2) in a medicinal plant: crystal structure at 1.93A and Surface Plasmon Resonance analysis of phospholipase A(2) complexed with berberine.,Chandra DN, Prasanth GK, Singh N, Kumar S, Jithesh O, Sadasivan C, Sharma S, Singh TP, Haridas M Biochim Biophys Acta. 2011 May;1814(5):657-63. Epub 2011 Mar 17. PMID:21420512[4] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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