Structure of PDB 3pq3 Chain A

Receptor sequence

>3pq3A (length=726) Species: 83333 (Escherichia coli K-12)

SLAPEDGSHRPAAEPTPPGAQPTAPGSLKAPDTRNEKLNSLEDVRKGSEN
YALTTNQGVRIADDQNSLRAGSRGPTLLEDFILREKITHFDHERIPERIV
HARGSAAHGYFQPYKSLSDITKADFLSDPNKITPVFVRFSTVQGGAGSAD
TVRDIRGFATKFYTEEGIFDLVGNNTPIFFIQDAHKFPDFVHAVKPEPHW
AIPQGQSAHDTFWDYVSLQPETLHNVMWAMSDRGIPRSYRTMEGFGCHTF
RLINAEGKATFVRFHWKPLAGKASLVWDEAQKLTGRDPDFHRRELWEAIE
AGDFPEYELGFQLIPEEDEFKFDFDLLDPTKLIPEELVPVQRVGKMVLNR
NPDNFFAENEQAAFHPGHIVPGLDFTNDPLLQGRLFSYTDTQISRLGGPN
FHEIPINRPTAPYHNFQRDGMHRMGIDTNPANYEPNSINDNWPRETPPGP
KRGGFESYQERVEGNKVRERSPSFGEYYSHPRLFWLSQTPFEQRHIVDGF
SFELSKVVRPYIRERVVDQLAHIDLTLAQAVAKNLGIELTDDQLNITPPP
DVNGLKKDPSLSLYAIPDGDVKGRVVAILLNDEVRSADLLAILKALKAKG
VHAKLLYSRMGEVTADDGTVLPIAATFAGAPSLTVDAVIVPAGNIADIAD
NGDANYYLMEAYKHLKPIALAGDARKFKATIKIADQGEEGIVEADSADGS
FMDELLTLMAAHRVWSRIPKIDKIPA

3D structure

• PDB: 3pq3 Modulation of heme orientation and binding by a single residue in catalase HPII of Escherichia coli.
• Chain: A
• Resolution: 1.79 Å

Enzymatic activity

• Catalytic site (original residue number in PDB): H128 N201 H392
• Catalytic site (residue number reindexed from 1): H101 N174 H365
• Enzyme Commision number: 1.11.1.6: catalase.

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	HDD	A	V127 H128 R165 V199 G200 N201 F206 F214 C274 H275 F391 L407 R411 S414 Y415 T418	V100 H101 R138 V172 G173 N174 F179 F187 C247 H248 F364 L380 R384 S387 Y388 T391
BS02	HDE	A	R125 V127 H128 R165 V199 G200 N201 A211 F214 C274 F391 L407 R411 S414 Y415 T418	R98 V100 H101 R138 V172 G173 N174 A184 F187 C247 F364 L380 R384 S387 Y388 T391

Gene Ontology

Molecular Function

• GO:0004096 catalase activity
• GO:0004601 peroxidase activity
• GO:0005506 iron ion binding
• GO:0020037 heme binding
• GO:0042802 identical protein binding
• GO:0046872 metal ion binding

Biological Process

• GO:0006972 hyperosmotic response
• GO:0006974 DNA damage response
• GO:0006979 response to oxidative stress
• GO:0042744 hydrogen peroxide catabolic process
• GO:0098869 cellular oxidant detoxification

Cellular Component

• GO:0005737 cytoplasm
• GO:0005829 cytosol

External links

• PDB: RCSB:3pq3, PDBe:3pq3, PDBj:3pq3
• PDBsum: 3pq3
• PubMed: 21332158
• UniProt: P21179|CATE_ECOLI Catalase HPII (Gene Name=katE)