Structure of PDB 1gi1 Chain A

Receptor sequence

>1gi1A (length=223) Species: 9913 (Bos taurus)

IVGGYTCGANTVPYQVSLNSGYHFCGGSLINSQWVVSAAHCYKSGIQVRL
GEDNINVVEGNEQFISASKSIVHPSYNSNTLNNDIMLIKLKSAASLNSRV
ASISLPTSCASAGTQCLISGWGNTKSSGTSYPDVLKCLKAPILSDSSCKS
AYPGQITSNMFCAGYLEGGKDSCQGDSGGPVVCSGKLQGIVSWGSGCAQK
NKPGVYTKVCNYVSWIKQTIASN

3D structure

• PDB: 1gi1 A novel serine protease inhibition motif involving a multi-centered short hydrogen bonding network at the active site.
• Chain: A
• Resolution: 1.42 Å

Enzymatic activity

• Catalytic site (original residue number in PDB): H57 D102 Q192 G193 D194 S195 G196
• Catalytic site (residue number reindexed from 1): H40 D84 Q174 G175 D176 S177 G178
• Enzyme Commision number: 3.4.21.4: trypsin.

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	CA	A	E70 N72 V75 V76 E80	E52 N54 V57 V58 E62
BS02	BMZ	A	H57 D189 S190 C191 S195 V213 G216	H40 D171 S172 C173 S177 V191 G194	MOAD: Ki=3.6uM PDBbind-CN: -logKd/Ki=5.47,Ki=3.4uM

Gene Ontology

Molecular Function

• GO:0004175 endopeptidase activity
• GO:0004252 serine-type endopeptidase activity
• GO:0005515 protein binding
• GO:0008236 serine-type peptidase activity
• GO:0046872 metal ion binding
• GO:0097655 serpin family protein binding

Biological Process

• GO:0006508 proteolysis
• GO:0007586 digestion

Cellular Component

• GO:0005576 extracellular region
• GO:0005615 extracellular space
• GO:0097180 serine protease inhibitor complex

External links

• PDB: RCSB:1gi1, PDBe:1gi1, PDBj:1gi1
• PDBsum: 1gi1
• PubMed: 11292354
• UniProt: P00760|TRY1_BOVIN Serine protease 1 (Gene Name=PRSS1)