4M7F

Crystal structure of tetrameric fibrinogen-like recognition domain of FIBCD1 with bound ManNAc

4M7F の概要

• エントリーDOI: 10.2210/pdb4m7f/pdb
• 関連するPDBエントリー: 1jc9 4M7H
• 分子名称: Fibrinogen C domain-containing protein 1, CALCIUM ION, 2-acetamido-2-deoxy-beta-D-glucopyranose, ... (6 entities in total)
• 機能のキーワード: fibrinogen-like domain, n-acetyl-binding protein, sugar binding protein
• 由来する生物種: Homo sapiens (human)
• タンパク質・核酸の鎖数: 2
• 化学式量合計: 52312.02

構造登録者

Shrive, A.K.,Greenhough, T.J.,Holmskov, U. (登録日: 2013-08-12, 公開日: 2013-12-11, 最終更新日: 2024-11-06)

主引用文献

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

実験手法

X-RAY DIFFRACTION (2.1 Å)