Structure of PDB 3iwm Chain C

Receptor sequence

>3iwmC (length=300)

SGFRKMAFPSGKVEGCMVQVTCGTTTLNGLWLDDTVYCPRHVICTAEDML
NPNYEDLLIRKSNHSFLVQAGNVQLRVIGHSMQNCLLRLKVDTSNPKTPK
YKFVRIQPGQTFSVLACYNGSPSGVYQCAMRPNHTIKGSFLNGSCGSVGF
NIDYDCVSFCYMHHMELPTGVHAGTDLEGKFYGPFVDRQTAQAAGTDTTI
TLNVLAWLYAAVINGDRWFLNRFTTTLNDFNLVAMKYNYEPLTQDHVDIL
GPLSAQTGIAVLDMCAALKELLQNGMNGRTILGSTILEDEFTPFDVVRQC

3D structure

• PDB: 3iwm Three-dimensional domain swapping as a mechanism to lock the active conformation in a super-active octamer of SARS-CoV main protease
• Chain: C
• Resolution: 3.2 Å

Enzymatic activity

• Catalytic site (original residue number in PDB): H41 G143 C145
• Catalytic site (residue number reindexed from 1): H41 G143 C145
• Enzyme Commision number: 2.1.1.-
  2.1.1.56: mRNA (guanine-N(7))-methyltransferase.
  2.1.1.57: methyltransferase cap1.
  2.7.7.48: RNA-directed RNA polymerase.
  2.7.7.50: mRNA guanylyltransferase.
  3.1.13.-
  3.4.19.12: ubiquitinyl hydrolase 1.
  3.4.22.-
  3.4.22.69: SARS coronavirus main proteinase.
  3.6.4.12: DNA helicase.
  3.6.4.13: RNA helicase.
  4.6.1.-

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	peptide	C	L27 H41 F140 N142 G143 C145 H163 H164 M165 E166 P168 R188 Q189 T190 A191	L27 H41 F140 N142 G143 C145 H163 H164 M165 E166 P168 R188 Q189 T190 A191

Gene Ontology

Molecular Function

• GO:0008233 peptidase activity

Biological Process

• GO:0019082 viral protein processing

External links

• PDB: RCSB:3iwm, PDBe:3iwm, PDBj:3iwm
• PDBsum: 3iwm
• PubMed: 21203949
• UniProt: P0C6X7|R1AB_SARS Replicase polyprotein 1ab (Gene Name=rep)