Table 1.

Kinetic parameters of human TPST1 with substrate peptides.

Substrate	K m (µM)	k cat (min−1)	k cat/K m (min−1µM−1)
C4P5Y5 peptide	7.67 ± 1.7	4.90 × 10−2 ± 2.4 × 10−3	6.4 × 10−3
Gastrin peptide	6.52 × 102 ± 4.1 × 10	6.57 × 10−3 ± 4.5 × 10−4	1.0 × 10−5