Structure of PDB 1icu Chain D

Receptor sequence

>1icuD (length=217) Species: 562 (Escherichia coli)

MDIISVALKRHSTKAFDASKKLTPEQAEQIKTLLQYSPSSTNSQPWHFIV
ASTEEGKARVAKSAAGNYVFNERKMLDASHVVVFCAKTAMDDVWLKLVVD
QEDADGRFATPEAKAANDKGRKFFADMHRKDLHDDAEWMAKQVYLNVGNF
LLGVAALGLDAVPIEGFDAAILDAEFGLKEKGYTSLVVVPVGHHSVEDFN
ATLPKSRLPQNITLTEV

3D structure

• PDB: 1icu The structure of Escherichia coli nitroreductase complexed with nicotinic acid: three crystal forms at 1.7 A, 1.8 A and 2.4 A resolution.
• Chain: D
• Resolution: 1.8 Å

Enzymatic activity

• Catalytic site (original residue number in PDB): K14 K74 E165
• Catalytic site (residue number reindexed from 1): K14 K74 E165
• Enzyme Commision number: 1.-.-.-
  1.5.1.34: 6,7-dihydropteridine reductase.

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	FMN	D	S39 S40 N42	S39 S40 N42
BS02	NIO	D	S40 T41 F124	S40 T41 F124
BS03	FMN	D	R10 H11 S12 K14 N71 K74 P163 I164 E165 G166 K205 R207	R10 H11 S12 K14 N71 K74 P163 I164 E165 G166 K205 R207

Gene Ontology

Molecular Function

• GO:0003955 NAD(P)H dehydrogenase (quinone) activity
• GO:0004155 6,7-dihydropteridine reductase activity
• GO:0010181 FMN binding
• GO:0016491 oxidoreductase activity
• GO:0042802 identical protein binding
• GO:0042803 protein homodimerization activity
• GO:0046857 oxidoreductase activity, acting on other nitrogenous compounds as donors, with NAD or NADP as acceptor

Biological Process

• GO:0046256 2,4,6-trinitrotoluene catabolic process

Cellular Component

• GO:0005829 cytosol
• GO:0016020 membrane

External links

• PDB: RCSB:1icu, PDBe:1icu, PDBj:1icu
• PDBsum: 1icu
• PubMed: 11491290
• UniProt: P38489|NFSB_ECOLI Oxygen-insensitive NAD(P)H nitroreductase (Gene Name=nfsB)