2asn: Difference between revisions

Revision as of 06:59, 18 February 2009

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File:2asn.png

Template:STRUCTURE 2asn

Crystal structure of D1A mutant of nitrophorin 2 complexed with imidazoleCrystal structure of D1A mutant of nitrophorin 2 complexed with imidazole

About this StructureAbout this Structure

2ASN is a 1 chain structure of sequence from Rhodnius prolixus. Full crystallographic information is available from OCA.

ReferenceReference

^{[xtra 1]}

↑ Andersen JF, Montfort WR. The crystal structure of nitrophorin 2. A trifunctional antihemostatic protein from the saliva of Rhodnius prolixus. J Biol Chem. 2000 Sep 29;275(39):30496-503. PMID:10884386 doi:http://dx.doi.org/10.1074/jbc.M002857200

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

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[1] Andersen JF, Montfort WR. The crystal structure of nitrophorin 2. A trifunctional antihemostatic protein from the saliva of Rhodnius prolixus. J Biol Chem. 2000 Sep 29;275(39):30496-503. PMID:10884386 doi:http://dx.doi.org/10.1074/jbc.M002857200

[xtra 1]

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-'''Crystal structure of D1A mutant of nitrophorin 2 complexed with imidazole'''
+===Crystal structure of D1A mutant of nitrophorin 2 complexed with imidazole===
-==Overview==
-Nitrophorin 2 (NP2) (also known as prolixin-S) is a salivary protein that transports nitric oxide, binds histamine, and acts as an anticoagulant during blood feeding by the insect Rhodnius prolixus. The 2.0-A crystal structure of NP2 reveals an eight-stranded antiparallel beta-barrel containing a ferric heme coordinated through His(57), similar to the structures of NP1 and NP4. All four Rhodnius nitrophorins transport NO and sequester histamine through heme binding, but only NP2 acts as an anticoagulant. Here, we demonstrate that recombinant NP2, but not recombinant NP1 or NP4, is a potent anticoagulant; recombinant NP3 also displays minor activity. Comparison of the nitrophorin structures suggests that a surface region near the C terminus and the loops between beta strands B-C and E-F is responsible for the anticoagulant activity. NP2 also displays larger NO association rates and smaller dissociation rates than NP1 and NP4, which may result from a more open and more hydrophobic distal pocket, allowing more rapid solvent reorganization on ligand binding. The NP2 protein core differs from NP1 and NP4 in that buried Glu(53), which allows for larger NO release rates when deprotonated, hydrogen bonds to invariant Tyr(81). Surprisingly, this tyrosine lies on the protein surface in NP1 and NP4.
 ==About this Structure==
-ASN is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Rhodnius_prolixus Rhodnius prolixus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2ASN OCA].
+ASN is a 1 chain structure of sequence from [http://en.wikipedia.org/wiki/Rhodnius_prolixus Rhodnius prolixus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2ASN OCA].
 ==Reference==
-The crystal structure of nitrophorin 2. A trifunctional antihemostatic protein from the saliva of Rhodnius prolixus., Andersen JF, Montfort WR, J Biol Chem. 2000 Sep 29;275(39):30496-503. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/10884386 10884386]
+<ref group="xtra">PMID:10884386</ref><references group="xtra"/>
 [[Category: Rhodnius prolixus]]
-[[Category: Single protein]]
 [[Category: Berry, R E.]]
 [[Category: Montfort, W R.]]
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 [[Category: Imidazole]]
 [[Category: Lipocalin]]
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