9PAP | pdb_00009pap

Chains	Domain Info	Class	Fold	Superfamily	Family	Domain	Species	Provenance Source (Version)
A	d9papa_	Alpha and beta proteins (a+b)	Cysteine proteinases	Cysteine proteinases	Papain-like	Papain	papaya (Carica papaya ) [TaxId: 3649 ],	SCOPe (2.08)

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
A	SCOP2B Superfamily	Cysteine proteinases	8036216	3001808	SCOP2B (2022-06-29)

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
A	Peptidase_C1	e9papA1	A: a/b three-layered sandwiches	X: ETN0001 domain-like	H: ETN0001 domain-like	T: Mss4-like	F: Peptidase_C1	ECOD (v294.1)

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
A	3.90.70.10	Alpha Beta	Alpha-Beta Complex	Cathepsin B	Chain A	CATH (4.3.0)

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A	PAPAIN	protein binding binding serpin family protein binding cysteine-type peptidase activity peptidase activity catalytic activity, acting on a protein hydrolase activity catalytic activity	proteolysis metabolic process cellular process primary metabolic process protein metabolic process macromolecule metabolic process	-

Chains	Accession	Name	Type
A	IPR038765	Papain-like cysteine peptidase superfamily	Homologous Superfamily
A	IPR025661	Cysteine peptidase, asparagine active site	Active Site
A	IPR000169	Cysteine peptidase, cysteine active site	Active Site
A	IPR025660	Cysteine peptidase, histidine active site	Active Site
A	IPR013128	Peptidase C1A	Family
A	IPR000668	Peptidase C1A, papain C-terminal	Domain
A	IPR013201	Cathepsin propeptide inhibitor domain (I29)	Domain
A	IPR039417	Papain-like cysteine endopeptidase	Domain

Modified Residue(s)
Chain	Residue(s)	Description
A	OCS	Parent Component: CYS : AA0556 : L-cysteic acid (L-cysteine sulfonic acid) MOD:00460

Chains	Enzyme Name	Description	Catalytic Residues
A	papain M-CSA #174	Papin is a member of the thiol protease family, which is a large, well-studied group with a well-known \"catalytic triad\" motif in which a cysteine acts as the catalytic nucleophile, activated by His and Asn. Papin catalyses the hydrolysis of proteins with broad specificity for peptide bonds, but shows a marked preference for an amino acid bearing a large hydrophobic side chain at the P2 position and does not accept Val in P1'.	Defined by 4 residues: GLN:A-19CYS:A-25HIS:A-159ASN:A-175 \| Explore in 3D: M-CSA Motif Definition Search M-CSA Motif EC: 3.4.22.2 (PDB Primary Data) Search M-CSA Motif + EC 3.4.22.2

RCSB PDB Core Operations are funded by the U.S. National Science Foundation (DBI-2321666), the US Department of Energy (DE-SC0019749), and the National Cancer Institute, National Institute of Allergy and Infectious Diseases, and National Institute of General Medical Sciences of the National Institutes of Health under grant R01GM157729. RCSB PDB uses resources of the National Energy Research Scientific Computing Center (NERSC), a Department of Energy User Facility.