1EED

X-ray crystallographic analysis of inhibition of endothiapepsin by cyclohexyl renin inhibitors

Summary for 1EED

• Entry DOI: 10.2210/pdb1eed/pdb
• Related PRD ID: PRD_000265
• Descriptor: ENDOTHIAPEPSIN, (2S)-2-[[(3S,4S)-5-cyclohexyl-4-[[(4S,5S)-5-[(2-methylpropan-2-yl)oxycarbonylamino]-4-oxidanyl-6-phenyl-hexanoyl]amino] -3-oxidanyl-pentanoyl]amino]-4-methyl-pentanoic acid (3 entities in total)
• Functional Keywords: aspartic proteinase, hydrolase-hydrolase inhibitor complex, hydrolase/hydrolase inhibitor
• Biological source: Cryphonectria parasitica (chestnut blight fungus)
• Total number of polymer chains: 1
• Total formula weight: 34447.67

Authors

Blundell, T.L.,Frazao, C.,Cooper, J.B. (deposition date: 1992-06-15, release date: 1994-01-31, Last modification date: 2024-10-30)

Primary citation

Cooper, J.,Quail, W.,Frazao, C.,Foundling, S.I.,Blundell, T.L.,Humblet, C.,Lunney, E.A.,Lowther, W.T.,Dunn, B.M.
X-ray crystallographic analysis of inhibition of endothiapepsin by cyclohexyl renin inhibitors.
Biochemistry, 31:8142-8150, 1992

PubMed Abstract: The crystal structures of endothiapepsin, a fungal aspartic proteinase (EC 3.4.23.6), cocrystallized with two oligopeptide renin inhibitors, PD125967 and PD125754, have been determined at 2.0-A resolution and refined to R-factors of 0.143 and 0.153, respectively. These inhibitors, which are of the hydroxyethylene and statine types, respectively, possess a cyclohexylalanine side chain at P1 and have interesting functionalities at the P3 position which, until now, have not been subjected to crystallographic analysis. PD125967 has a bis(1-naphthylmethyl)acetyl residue at P3, and PD125754 possesses a hydroxyethylene analogue of the P3-P2 peptide bond for proteolytic stability. The structures reveal that the S3 pocket accommodates one naphthyl ring with conformational changes of the Asp 77 and Asp 114 side chains, the other naphthyl group residing in the S4 region. The P3-P2 hydroxyethylene analogue of PD125754 forms a hydrogen bond with the NH of Thr 219, thereby making the same interaction with the enzyme as the equivalent peptide groups of all inhibitors studied so far. The absence of side chains at the P2 and P1' positions of this inhibitor allows water molecules to occupy the respective pockets in the complex. The relative potencies of PD125967 and PD125754 for endothiapepsin are consistent with the changes in solvent-accessible area which take place on inhibitor binding.

PubMed: 1525155
DOI: 10.1021/bi00150a005

Experimental method

X-RAY DIFFRACTION (2 Å)