Structure of PDB 3as0 Chain A

Receptor sequence

>3as0A (length=570) Species: 669 (Vibrio harveyi)

APTAPSIDMYGSNNLQFSKIELAMETTSGYNDMVKYHELAKIKVKFNQWS
GTSGDTYNVYFDGVKVATGAITGSQTTASFEYGQGGLYQMEIEACDATGC
SKSAPVEITIADTDGSHLKPLTMNVDPNNKSYNTDPSIVMGTYFVEWGIY
GRDYTVDNMPVDNLTHILYGFIPICGPNESVKSVGGNSFNALQTACRGVN
DYEVVIHDPWAAYQKSFPQAGHEYSTPIKGNYAMLMALKQRNPDLKIIPS
IGGGTLSDPFYDFVDKKNRDTFVASVKKFLKTWKFYDGVDIDWEFPGGGG
AAADKGDPVNDGPAYIALMRELRVMLDELEAETGRTYELTSAIGVGYDKI
EDVDYADAVQYMDYIFAMTYDFYGGWNNVPGHQTALYCGSFMRPGQCDGG
GVDENGEPYKGPAYTADNGIQLLLAQGVPANKLVLGTAMYGRGWEGVTPD
TLTDPNDPMTGTATGKLKGSTAQGVWEDGVIDYKGIKSFMLGANNTGING
FEYGYDAQAEAPWVWNRSTGELITFDDHRSVLAKGNYAKSLGLAGLFSWE
IDADNGDILNAMHEGMAGGV

3D structure

• PDB: 3as0 Potent family-18 chitinase inhibitors: x-ray structures, affinities, and binding mechanisms
• Chain: A
• Resolution: 2.0 Å

Enzymatic activity

• Catalytic site (original residue number in PDB): D311 D313 E315 Y391
• Catalytic site (residue number reindexed from 1): D290 D292 E294 Y370
• Enzyme Commision number: 3.2.1.14: chitinase.

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	SAU	A	D392 W397	D371 W376	PDBbind-CN: -logKd/Ki=4.55,Kd=28uM
BS02	SAU	A	E315 F316 G320 G321 A322	E294 F295 G299 G300 A301	PDBbind-CN: -logKd/Ki=4.55,Kd=28uM

Gene Ontology

Molecular Function

• GO:0004553 hydrolase activity, hydrolyzing O-glycosyl compounds
• GO:0004568 chitinase activity
• GO:0008061 chitin binding

Biological Process

• GO:0005975 carbohydrate metabolic process
• GO:0006032 chitin catabolic process

External links

• PDB: RCSB:3as0, PDBe:3as0, PDBj:3as0
• PDBsum: 3as0
• PubMed: 21531720
• UniProt: Q9AMP1