ID   3.4.21.41
DE   complement subcomponent C1r.
CA   Selective cleavage of Lys(or Arg)-|-Ile bond in complement subcomponent
CA   C1s to form the active form of C1s (EC 3.4.21.42).
CC   -!- Activates C1s by proteolytic cleavage so that it can, in turn,
CC       activate C2 and C4.
CC   -!- Activated from proenzyme C1r in plasma by autocatalytic mechanism
CC       during activation of the complement system by the 'classical' route.
CC   -!- Belongs to peptidase family S1.
DR   Q8CG16, C1RA_MOUSE ;  Q8CFG9, C1RB_MOUSE ;  P00736, C1R_HUMAN  ;
DR   Q4R577, C1R_MACFA  ;  Q5R1W3, C1R_PANTR  ;  Q5R544, C1R_PONAB  ;
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