1rgq Summary

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M9A HCV Protease complex with pentapeptide keto-amide inhibitor

The structure was published by Liu, Y., Stoll, V.S., Richardson, P.L., et al., Molla, A., Kohlbrenner, W., and Kati, W.M., in 2004 in a paper entitled "Hepatitis C NS3 protease inhibition by peptidyl-alpha-ketoamide inhibitors: kinetic mechanism and structure." (abstract).

This crystal structure was determined using X-ray diffraction at a resolution of 2.9 Å and deposited in 2003.

The experimental data on which the structure is based was also deposited.

This PDB entry contains a complex of 2 biomacromolecules, namely NS3 Protease and NS4A peptide.

It also contains one or more heterogenic compounds (e.g., ligands, co-factors, ions, modified amino acids, etc.); see here for a complete list.

The molecule most likely forms heterotetramers.

The following tables show cross-reference information to other databases (to obtain a list of all PDB entries sharing the same property or classification, click on the magnifying glass icon):


Chain Name UniProt Name of source organism % of UniProt sequence present in the sample Residues in the sample molecules % of residues observed
A NS3 Protease P27958 (1027-1207) (POLG_HCVH)search Hepatitis C virus (isolate H)search < 90% 200 93%
B NS3 Protease P27958 (1027-1207) (POLG_HCVH)search Hepatitis C virus (isolate H)search < 90% 200 93%
C NS4A peptide O39914 (6-24) (O39914_9HEPC)search Hepatitis C virussearch < 90% 22 100%
D NS4A peptide O39914 (6-24) (O39914_9HEPC)search Hepatitis C virussearch < 90% 22 100%


This entry contains 2 unique UniProt proteins:

UniProt accession Name Organism PDB
P27958 (1027 - 1207) NS3 Protease Hepatitis C virus
O39914 (6 - 24) NS4A peptide

Chain Structural classification (SCOP) Structural classification (CATH) Sequence family (Pfam)
A, B Viral proteasessearch Thrombin, subunit Hsearch, Trypsin-like serine proteasessearch Hepatitis C virus NS3 proteasesearch
C, D Viral proteasessearch Hepatitis C virus non-structural protein NS4asearch

Chain ID Molecular function (GO) Biological process (GO)
A, B (P27958) serine-type peptidase activitysearch catalytic activitysearch transformation of host cell by virussearch proteolysissearch

Chain InterPro annotation
A, B Peptidase S29, hepatitus C polyprotein NS3search Trypsin-like cysteine/serine peptidase domainsearch
C, D Hepatitis C virus non-structural protein NS4asearch