Structure of PDB 1c21 Chain A

Receptor sequence

>1c21A (length=262) Species: 562 (Escherichia coli)

AISIKTPEDIEKMRVAGRLAAEVLEMIEPYVKPGVSTGELDRICNDYIVN
EQHAVSACLGYHGYPKSVCISINEVVCHGIPDDAKLLKDGDIVNIDVTVI
KDGFHGDTSKMFIVGKPTIMGERLCRITQESLYLALRMVKPGINLREIGA
AIQKFVEAEGFSVVREYCGHGIGQGFHEEPQVLHYDSRETNVVLKPGMTF
TIEPMVNAGKKEIRTMKDGWTVKTKDRSLSAQYEHTIVVTDNGCEILTLR
KDDTIPAIISHD

3D structure

• PDB: 1c21 Insights into the mechanism of Escherichia coli methionine aminopeptidase from the structural analysis of reaction products and phosphorus-based transition-state analogues.
• Chain: A
• Resolution: 1.8 Å

Enzymatic activity

• Catalytic site (original residue number in PDB): H79 D97 D108 H171 Q175 H178 Q182 E204 N208 Q233 E235
• Catalytic site (residue number reindexed from 1): H78 D96 D107 H170 Q174 H177 Q181 E203 N207 Q232 E234
• Enzyme Commision number: 3.4.11.18: methionyl aminopeptidase.

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	CO	A	D108 H171 T202 E204 E235	D107 H170 T201 E203 E234
BS02	CO	A	D97 D108 E235	D96 D107 E234
BS03	MET	A	D97 D108 F177 H178 E204 W221 E235	D96 D107 F176 H177 E203 W220 E234

Gene Ontology

Molecular Function

• GO:0004177 aminopeptidase activity
• GO:0004239 initiator methionyl aminopeptidase activity
• GO:0008198 ferrous iron binding
• GO:0008235 metalloexopeptidase activity
• GO:0046872 metal ion binding
• GO:0046914 transition metal ion binding
• GO:0070006 metalloaminopeptidase activity

Biological Process

• GO:0006508 proteolysis

Cellular Component

• GO:0005829 cytosol

External links

• PDB: RCSB:1c21, PDBe:1c21, PDBj:1c21
• PDBsum: 1c21
• PubMed: 10555963
• UniProt: P0AE18|MAP1_ECOLI Methionine aminopeptidase (Gene Name=map)