4M7H

Crystal structure of tetrameric fibrinogen-like recognition domain of FIBCD1

Summary for 4M7H

• Entry DOI: 10.2210/pdb4m7h/pdb
• Related: 1jc9 4m7f
• Descriptor: Fibrinogen C domain-containing protein 1, CALCIUM ION, 2-acetamido-2-deoxy-beta-D-glucopyranose, ... (7 entities in total)
• Functional Keywords: fibrinogen-like domain, n-acetyl-binding protein, putative chitin receptor, carbohydrate/sugar binding, sugar binding protein
• Biological source: Homo sapiens (human)
• Total number of polymer chains: 2
• Total formula weight: 52117.81

Authors

Shrive, A.K.,Greenhough, T.J.,Holmskov, U. (deposition date: 2013-08-12, release date: 2013-12-11, Last modification date: 2024-11-20)

Primary citation

Shrive, A.K.,Moeller, J.B.,Burns, I.,Paterson, J.M.,Shaw, A.J.,Schlosser, A.,Sorensen, G.L.,Greenhough, T.J.,Holmskov, U.
Crystal Structure of the Tetrameric Fibrinogen-like Recognition Domain of Fibrinogen C Domain Containing 1 (FIBCD1) Protein.
J.Biol.Chem., 289:2880-2887, 2014

PubMed Abstract: The high resolution crystal structures of a recombinant fragment of the C-terminal fibrinogen-like recognition domain of FIBCD1, a vertebrate receptor that binds chitin, have been determined. The overall tetrameric structure shows similarity in structure and aggregation to the horseshoe crab innate immune protein tachylectin 5A. The high affinity ligand N-acetylmannosamine (ManNAc) binds in the S1 site, predominantly via the acetyl group with the oxygen and acetamide nitrogen hydrogen-bonded to the protein and the methyl group inserted into a hydrophobic pocket. The binding of the ManNAc pyranose ring differs markedly between the two independent subunits, but in all structures the binding of the N-acetyl group is conserved. In the native structure, a crystal contact results in one of the independent protomers binding the first GlcNAc of the Asn(340) N-linked glycan on the other independent protomer. In the ligand-bound structure this GlcNAc is replaced by the higher affinity ligand ManNAc. In addition, a sulfate ion has been modeled into the electron density at a location similar to the S3 binding site in L-ficolin, whereas in the native structure an acetate ion has been placed in the S1 N-acetyl binding site, and a sulfate ion has been placed adjacent to this site. These ion binding sites are ideally placed to receive the N-acetyl and sulfate groups of sulfated GalNAc residues of glycosaminoglycans such as chondroitin and dermatan sulfate. Together, these structures give insight into important determinants of ligand selectivity, demonstrating versatility in recognition and binding while maintaining conservation in N-acetyl and calcium binding.

PubMed: 24293368
DOI: 10.1074/jbc.M113.520577

Experimental method

X-RAY DIFFRACTION (2 Å)