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1n73

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[[Image:1n73.gif|left|200px]]
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{{STRUCTURE_1n73| PDB=1n73 | SCENE= }}
{{STRUCTURE_1n73| PDB=1n73 | SCENE= }}
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'''Fibrin D-Dimer, Lamprey complexed with the PEPTIDE LIGAND: GLY-HIS-ARG-PRO-AMIDE'''
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===Fibrin D-Dimer, Lamprey complexed with the PEPTIDE LIGAND: GLY-HIS-ARG-PRO-AMIDE===
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==Overview==
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The crystal structure of fragment double-D from factor XIII-cross-linked lamprey fibrin has been determined at 2.9 A resolution. The 180 kDa covalent dimer was cocrystallized with the peptide Gly-His-Arg-Pro-amide, which in many fibrinogens, but not that of lamprey, corresponds to the B-knob exposed by thrombin. The structure was determined by molecular replacement, a recently determined structure of lamprey fragment D being used as a search model. GHRPam was found in both the gamma- and beta-chain holes. Unlike the situation with fragment D, the crystal packing of the cross-linked double-D structure exhibits two different D-D interfaces, each gamma-chain facing gamma-chains on two other molecules. One of these (interface I) involves the asymmetric interface observed in all other D fragments and related structures. The other (interface II) encompasses a completely different set of residues. The two abutments differ in that interface I results in an "in line" arrangement of abutting molecules and the interface II in a "zigzag" arrangement. So far as can be determined (the electron density could only be traced on one side of the cross-links), it is the gamma-chains of the newly observed zigzag units (interface II) that are joined by the reciprocal epsilon-amino-gamma-glutamyl cross-links. Auspiciously, the same novel D-D interface was observed in two lower-resolution crystal structures of human double-D preparations that had been crystallized under unusual circumstances. These observations show that double-D structures are linked in a way that is sufficiently flexible to accommodate different D-D interfaces under different circumstances.
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(as it appears on PubMed at http://www.pubmed.gov), where 12501189 is the PubMed ID number.
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{{ABSTRACT_PUBMED_12501189}}
==About this Structure==
==About this Structure==
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[[Category: Isopeptide cross-linked chain]]
[[Category: Isopeptide cross-linked chain]]
[[Category: Protein-peptide complex]]
[[Category: Protein-peptide complex]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 02:10:41 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jul 28 10:27:10 2008''

Revision as of 07:27, 28 July 2008

Image:1n73.png

Template:STRUCTURE 1n73

Fibrin D-Dimer, Lamprey complexed with the PEPTIDE LIGAND: GLY-HIS-ARG-PRO-AMIDE

Template:ABSTRACT PUBMED 12501189

About this Structure

1N73 is a Protein complex structure of sequences from Petromyzon marinus. Full crystallographic information is available from OCA.

Reference

The crystal structure of fragment double-D from cross-linked lamprey fibrin reveals isopeptide linkages across an unexpected D-D interface., Yang Z, Pandi L, Doolittle RF, Biochemistry. 2002 Dec 31;41(52):15610-7. PMID:12501189

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