Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

ChainsTypeFamily Name Domain Identifier Family IdentifierProvenance Source (Version)
ASCOP2B SuperfamilyTrypsin-like serine proteases 8042267 3000114 SCOP2B (2022-06-29)
BSCOP2B SuperfamilyTrypsin-like serine proteases 8042267 3000114 SCOP2B (2022-06-29)
CSCOP2B SuperfamilyTrypsin-like serine proteases 8042267 3000114 SCOP2B (2022-06-29)
DSCOP2B SuperfamilyTrypsin-like serine proteases 8042267 3000114 SCOP2B (2022-06-29)

Domain Annotation: ECOD Classification ECOD Database Homepage

ChainsFamily NameDomain Identifier ArchitecturePossible HomologyHomologyTopologyFamilyProvenance Source (Version)
ATrypsin_1e1qrzA1 A: beta barrelsX: cradle loop barrelH: RIFT-relatedT: FMN-binding split barrel 2F: Trypsin_1ECOD (1.6)
BTrypsin_1e1qrzB1 A: beta barrelsX: cradle loop barrelH: RIFT-relatedT: FMN-binding split barrel 2F: Trypsin_1ECOD (1.6)
CTrypsin_1e1qrzC1 A: beta barrelsX: cradle loop barrelH: RIFT-relatedT: FMN-binding split barrel 2F: Trypsin_1ECOD (1.6)
DTrypsin_1e1qrzD1 A: beta barrelsX: cradle loop barrelH: RIFT-relatedT: FMN-binding split barrel 2F: Trypsin_1ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Protein Family Annotation Pfam Database Homepage

ChainsAccessionNameDescriptionCommentsSource
A, B, C, D
PF00089Trypsin (Trypsin)Trypsin- Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

ChainsPolymerMolecular FunctionBiological ProcessCellular Component
A, B, C, D
PLASMINOGEN

Structure Motif Annotation: Mechanism and Catalytic Site Atlas M-CSA Database Homepage

ChainsEnzyme NameDescriptionCatalytic Residues
plasmin  M-CSA #425

Human Plasminogen is a serine protease, a member of the Trypsin superfamily. It is a zymogen that can be activated to give the serine protease plasmin. Plasmin hydrolyses fibrin and dissolves blood clots. Plasmin has broad specificity but preferentially cleaves Lys-Xaa to Arg-Xaa amide bonds and can not directly catalyse proteolytic activation of plasminogen - it activates activators instead.

Under physiological conditions, activation is mediated by limited proteolysis carried out by urokinase and tissue-type plasminogen activator.

Like most zymogens, plasminogen has an activation loop which is proteolytically cleaved between Arg 561 and Val 562 when the protein is activated, resulting in conformational changes, including formation of a new solvent-inaccessible salt bridge and a functional active site.

Plasminogen activation is known to play a role in the activation of metalloproteinases and lipoxygenase and is linked to many physiological and pathological processes involved in cell migration such as cancer metastasis, angiogenesis, ovum maturation, embryogenesis, wound healing and pathogen invasion.

The PDB code 1qrz refers to the inactive precursor plasminogen, which is activated by cleavage leading to the opening of the active site. The specificity pocket is similar to that of trypsin, with plasmin showing a preference for cleavage after aliphatic basic residues such as Lysine and Arginine.

Defined by 4 residues: HIS:A-58 [auth A-603]ASP:A-101 [auth A-646]SER:A-196 [auth A-741]GLY:A-197 [auth A-742]
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