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ENZYME entry: EC

Accepted Name
peptidase 1 (mite)
Alternative Name(s)
allergen Der p 1
endopeptidase 1 (mite)
major mite fecal allergen Der p 1
Reaction catalysed
Broad endopeptidase specificity
  • This enzyme, derived from the house dust mite, is a major component of the allergic immune response.
  • The substrate specificity of this enzyme is not altogether clear; it cleaves the low-affinity IgE receptor CD23 at 298-Glu-|-Ser-299 and 155-Ser-|-Ser-156.
  • It also cleaves the pulmonary structural proteins occludin and claudin at Leu-|-Leu, Asp-|-Leu and at Gly-|-Thr bonds, and it can also cleave the alpha subunit of the interleukin-2 (IL-2) receptor (CD25).
  • Using a positional scanning combinatorial library, it was found that the major substrate-specificity determinant is for Ala in the P2 position.
  • The enzyme shows only a slight preference for basic amino acids in the P1 and P3 positions and a preference for aliphatic amino acids such as Ile, Pro, Val, Leu and norleucine in the P4 position.
  • Belongs to peptidase family C1.
PRIAM enzyme-specific profiles3.4.22.65
KEGG Ligand Database for Enzyme Nomenclature3.4.22.65
IUBMB Enzyme Nomenclature3.4.22.65
MEDLINEFind literature relating to
Rhea expert-curated reactions3.4.22.65

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