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. 1999 May 11;96(10):5418–5422. doi: 10.1073/pnas.96.10.5418

Table 2.

Inhibition of 20S proteasome by intra-ring bivalent inhibitors, IC50, μM

Inhibitor PGPH Trypsin-like Chymotrypsinlike
Ac-LLnL-H (1) >100 >100 2.1
OHC-CO-LGPGGLLnL-H (3) >100 >100 0.08
Lev-KKGEVSLE-H (4) 102 >100 >100
Saa-KKGEVSLE-H (5) 82 >100 >100
Saa-AAEVSLE-H (6) 146 >100 >100

Lev, levulinic acid; Saa, 4-oxobutyric acid.