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In the mature DPP1 molecule, the exclusion domain binds the catalytic domain through non-covalent interactions and restricts substrate access to regions upstream of the S2 subsite via steric hindrance, determining DPP1s unique dipeptidyl peptidase activity ( The DPP1 active site structure reflects the molecular basis for its broad substrate specificity

PMID 11470726

Aittoniemi, J., Jensen, M., Pan, A