Structure of PDB 1ai8 Chain H

Receptor sequence

>1ai8H (length=251) Species: 9606 (Homo sapiens)

IVEGSDAEIGMSPWQVMLFRKSPQELLCGASLISDRWVLTAAHCLLYPPW
DKNFTENDLLVRIGKHSRTRYERNIEKISMLEKIYIHPRYNWRENLDRDI
ALMKLKKPVAFSDYIHPVCLPDRETAASLLQAGYKGRVTGWGNLKETKGQ
PSVLQVVNLPIVERPVCKDSTRIRITDNMFCAGYKPDEGKRGDACEGDSG
GPFVMKSPFNNRWYQMGIVSWGEGCDRDGKYGFYTHVFRLKKWIQKVIDQ
F

3D structure

• PDB: 1ai8 The refined 1.9-A X-ray crystal structure of D-Phe-Pro-Arg chloromethylketone-inhibited human alpha-thrombin: structure analysis, overall structure, electrostatic properties, detailed active-site geometry, and structure-function relationships.
• Chain: H
• Resolution: 1.85 Å

Enzymatic activity

• Enzyme Commision number: 3.4.21.5: thrombin.

Interaction with ligand

Site #	Ligand	Ligand chain	Binding residues on receptor (original residue number in PDB)	Binding residues on receptor (residue number reindexed from 1)	Binding affinity
BS01	peptide	H	E23 G25 M26 P28 W29 D116 H119 P120 C122 Y134 K135 R137 N159 M201 K202 N205 R206 W207	E8 G10 M11 P13 W14 D113 H116 P117 C119 Y134 K135 R137 N158 M205 K206 N211 R212 W213
BS02	peptide	H	F34 Q38 L65 R67 R73 T74 R75 Y76 K81 I82 M84	F19 Q24 L60 R62 R68 T69 R70 Y71 K77 I78 M80
BS03	T42	H	H57 Y60A W60D N98 L99 I174 D189 G193 S195 S214 W215 G216 E217	H43 Y47 W50 N95 L96 I173 D193 G197 S199 S220 W221 G222 E223

Gene Ontology

Molecular Function

• GO:0004252 serine-type endopeptidase activity
• GO:0005509 calcium ion binding

Biological Process

• GO:0006508 proteolysis
• GO:0007596 blood coagulation

External links

• PDB: RCSB:1ai8, PDBe:1ai8, PDBj:1ai8
• PDBsum: 1ai8
• PubMed: 1304349
• UniProt: P00734|THRB_HUMAN Prothrombin (Gene Name=F2)