Table 10.

Inhibitors and their inhibition constants against furin, matriptase, and trypsin (Data taken from Table 1 and Table 2 of Fittler et al. [230]).

No.	P5	P4	P3	P2	P1	P1′–P4′				C terminal	Ki, nM
	1	2	3	4	5	6–9	10	11	12		Furin	Matriptase	Trypsin
11	K	R	C	K	K	SIPP	I	C	F	NH2	0.49	560	>10,000
12	K	R	C	K	K	SIPP	I	C		NH2	0.71	4528	>10,000
16	K	R	Aha	K	K	SIPP	I	Pra		NH2	21.8	9298	>10,000
17	K	R	Aha	K	K	SIPP	I	Pra		NH2	5.0	6681	>10,000

SIPP—Ser-Ile-Pro-Pro; Aha—L-azidohomoalanine; Pra—l-propargylglycine.