RCSB PDB - 4ZHL: The crystal structure of mupain-1-IG in complex with murinised human uPA at pH7.4 (original) (raw)
Selection of High-Affinity Peptidic Serine Protease Inhibitors with Increased Binding Entropy from a Back-Flip Library of Peptide-Protease Fusions.
[Srensen, H.P.](/search?q=citation.rcsb%5Fauthors:Srensen, H.P.), [Xu, P.](/search?q=citation.rcsb%5Fauthors:Xu, P.), [Jiang, L.](/search?q=citation.rcsb%5Fauthors:Jiang, L.), [Kromann-Hansen, T.](/search?q=citation.rcsb%5Fauthors:Kromann-Hansen, T.), [Jensen, K.J.](/search?q=citation.rcsb%5Fauthors:Jensen, K.J.), [Huang, M.](/search?q=citation.rcsb%5Fauthors:Huang, M.), [Andreasen, P.A.](/search?q=citation.rcsb%5Fauthors:Andreasen, P.A.)
(2015) J Mol Biology 427: 3110-3122
PubMed: 26281711 Search on PubMed
PubMed Abstract:
We have developed a new concept for designing peptidic protein modulators, by recombinantly fusing the peptidic modulator, with randomized residues, directly to the target protein via a linker and screening for internal modulation of the activity of the protein. We tested the feasibility of the concept by fusing a 10-residue-long, disulfide-bond-constrained inhibitory peptide, randomized in selected positions, to the catalytic domain of the serine protease murine urokinase-type plasminogen activator. High-affinity inhibitory peptide variants were identified as those that conferred to the fusion protease the lowest activity for substrate hydrolysis. The usefulness of the strategy was demonstrated by the selection of peptidic inhibitors of murine urokinase-type plasminogen activator with a low nanomolar affinity. The high affinity could not have been predicted by rational considerations, as the high affinity was associated with a loss of polar interactions and an increased binding entropy.
Organizational Affiliation:
Department of Molecular Biology and Genetics, Aarhus University, 8000 Aarhus C, Denmark.