1rf1: Difference between revisions

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[[Image:1rf1.gif|left|200px]]
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{{STRUCTURE_1rf1|  PDB=1rf1  |  SCENE=  }}  
{{STRUCTURE_1rf1|  PDB=1rf1  |  SCENE=  }}  


'''Crystal Structure of Fragment D of gammaE132A Fibrinogen with the Peptide Ligand Gly-His-Arg-Pro-amide'''
===Crystal Structure of Fragment D of gammaE132A Fibrinogen with the Peptide Ligand Gly-His-Arg-Pro-amide===




==Overview==
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Structural analysis of recombinant fibrinogen fragment D revealed that the calcium-binding site (beta2-site) composed of residues BbetaAsp261, BbetaAsp398, BbetaGly263, and gammaGlu132 is modulated by the "B:b" interaction. To determine the beta2-site's role in polymerization, we engineered variant fibrinogen gammaE132A in which calcium binding to the beta2-site was disrupted by replacing glutamic acid at gamma132 with alanine. We compared polymerization of gammaE132A to normal fibrinogen as a function of calcium concentration. Polymerization of gammaE132A at concentrations of calcium &lt;or=1 mM exhibited an uncharacteristic 2-3-fold increase in lateral aggregation and fiber thickness compared to normal fibrinogen, while polymerization of variant and normal were indistinguishable at 10 mM calcium. These results suggest that the beta2-site controls the extent of lateral aggregation. That is, when the calcium anchor (beta2-site) is eliminated before "B:b" interactions occur then lateral aggregation is enhanced. We solved structures of fragment D of gammaE132A fibrinogen (rfD-gammaE132A) with and without Gly-His-Arg-Pro-amide (GHRPam) and found no change to the global structure. X-ray diffraction data showed GHRPam binding in the "a" and "b" polymerization sites and that calcium could still bind to the beta2-site of gammaE132A fibrinogen at 70 mM calcium. We found that the gamma2 calcium-binding site (in loop gamma294-301) did not have calcium bound in the structure of fragment D of gammaE132A fibrinogen with GHRPam bound (rfD-gammaE132A+GH). Analysis of structures rfD-gammaE132A+GH and rfD-BbetaD398A+GH indicated that differences in calcium occupation of the gamma2-site resulted from minor conformational changes provoked by crystal packing and GHRPam binding to the "a" site did not directly modulate calcium binding to this site.
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==Disease==
==Disease==
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[[Category: Fragment d of gammae132a]]
[[Category: Fragment d of gammae132a]]
[[Category: Recombinant fibrinogen fragment d]]
[[Category: Recombinant fibrinogen fragment d]]
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May  3 07:24:56 2008''
 
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jul 28 16:06:38 2008''

Revision as of 16:06, 28 July 2008

File:1rf1.png

Template:STRUCTURE 1rf1

Crystal Structure of Fragment D of gammaE132A Fibrinogen with the Peptide Ligand Gly-His-Arg-Pro-amideCrystal Structure of Fragment D of gammaE132A Fibrinogen with the Peptide Ligand Gly-His-Arg-Pro-amide

Template:ABSTRACT PUBMED 14992585

DiseaseDisease

Known disease associated with this structure: Afibrinogenemia, congenital OMIM:[134820], Amyloidosis, hereditary renal OMIM:[134820], Dysfibrinogenemia, alpha type, causing bleeding diathesis OMIM:[134820], Dysfibrinogenemia, alpha type, causing recurrent thrombosis OMIM:[134820], Afibrinogenemia, congenital OMIM:[134830], Dysfibrinogenemia, beta type OMIM:[134830], Thrombophilia, dysfibrinogenemic OMIM:[134830], Dysfibrinogenemia, gamma type OMIM:[134850], Hypofibrinogenemia, gamma type OMIM:[134850], Thrombophilia, dysfibrinogenemic OMIM:[134850]

About this StructureAbout this Structure

1RF1 is a Protein complex structure of sequences from Homo sapiens. Full crystallographic information is available from OCA.

ReferenceReference

Calcium-binding site beta 2, adjacent to the "b" polymerization site, modulates lateral aggregation of protofibrils during fibrin polymerization., Kostelansky MS, Lounes KC, Ping LF, Dickerson SK, Gorkun OV, Lord ST, Biochemistry. 2004 Mar 9;43(9):2475-83. PMID:14992585

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