The Active Site of Aspartic ProteinasesPearl, L., Blundell, T.
(1984) FEBS Lett. 174: 96-101
- PubMed: 6381096
- Primary Citation of Related Structures:
- PubMed Abstract:
- Active Site of Acid Proteinases
Blundell, T.L.,Jones, H.B.,Khan, G.,Taylor, G.,Sewell, T.S.,Pearl, L.H.,Wood, S.P.
(1979) Proc.FEBS Meet. 60: 281
- X-Ray Analysis and Circular Dichroism of the Acid Protease from Endothia Parasitica and Chymosin
Jenkins, J.,Tickle, I.,Sewell, T.,Ungaretti, L.,Wollmer, A.,Blundell, T.
(1977) Adv.Exp.Med.Biol. 95: 43
- Homology Among Acid Proteases. Comparison of Crystal Structures at 3 Angstroms Resolution of Acid Proteases from Rhizopus Chinensis and Endothia Parasitica
Subramanian, E.,Swan, I.D.A.,Liu, M.,Davies, D.R.,Jenkins, J.A.,Tickle, I.J.,Blundell, T.L.
(1977) Proc.Natl.Acad.Sci.USA 74: 556
- The Three-Dimensional Structure of Acid Proteinases
Blundell, T.L.,Jenkins, J.A.,Khan, G.,Roychowdhury, P.,Sewell, T.,Tickle, I.J.,Wood, E.A.
(1979) Proc.FEBS Meet. 52: 81
- Structural Evidence for Gene Duplication in the Evolution of Acid Proteases
Tang, J.,James, M.N.G.,Hsu, I.N.,Jenkins, J.A.,Blundell, T.L.
(1978) Nature 271: 618
- Four-Fold Structural Repeat in the Acid Proteases
Blundell, T.L.,Sewell, B.T.,Mclachlan, A.D.
(1979) Biochim.Biophys.Acta 580: 24
The active site of the aspartic proteinase, endothiapepsin, has been defined by X-ray analysis and restrained least-squares refinement at 2.1 A resolution with a crystallographic agreement value of 0.16. The environments of the two catalytically impo ...
The active site of the aspartic proteinase, endothiapepsin, has been defined by X-ray analysis and restrained least-squares refinement at 2.1 A resolution with a crystallographic agreement value of 0.16. The environments of the two catalytically important aspartyl groups are remarkably similar and the contributions of the NH2- and COOH-terminal domains to the catalytic centre are related by a local 2-fold axis. The carboxylates of the aspartyls share a hydrogen bond and have equivalent contacts to a bound water molecule or hydroxonium ion lying on the local diad. The main chains around 32 and 215 are connected by a novel interaction involving diad-related threonines. It is suggested that the two pKa values of the active site aspartyls arise from a structure not unlike that in maleic acid with a hydrogen-bonded intermediate species and a dicarboxylate characterised by electrostatic repulsions between the two negatively charged groups.