3EST

STRUCTURE OF NATIVE PORCINE PANCREATIC ELASTASE AT 1.65 ANGSTROMS RESOLUTION

Summary for 3EST

• Entry DOI: 10.2210/pdb3est/pdb
• Descriptor: PORCINE PANCREATIC ELASTASE, CALCIUM ION, SULFATE ION, ... (4 entities in total)
• Functional Keywords: hydrolase(serine proteinase)
• Biological source: Sus scrofa (pig)
• Cellular location: Secreted: P00772
• Total number of polymer chains: 1
• Total formula weight: 26160.24

Authors

Meyer, E.F.,Cole, G.,Radhakrishnan, R.,Epp, O. (deposition date: 1987-09-17, release date: 1988-01-16, Last modification date: 2024-10-23)

Primary citation

Meyer, E.,Cole, G.,Radhakrishnan, R.,Epp, O.
Structure of native porcine pancreatic elastase at 1.65 A resolutions.
Acta Crystallogr.,Sect.B, 44:26-38, 1988

PubMed Abstract: The structure of native porcine pancreatic elastase in 70% methanol has been refined using film data to 1.65 A resolution, R = 0.169. A total of 134 molecules of water (but no methanol) has been refined. This structure, because of its native state and modestly high resolution, serves as the basis for comparison with other elastase structures complexed with natural or synthetic ligands. Internal structured water occupies distinct regions. Two regions (IW1 and IW7) suggest a mechanism for equalizing 'hydrostatic pressure' related to ligand binding and release. A third region (IW4) forms part of a hydrogen-bonding network linking the catalytic Ser 195 O gamma with a remote (13.4 A) surface of the enzyme. A comparison with the structures of all known serine proteases reveals that a linkage of Ser O gamma to remote surface is conserved in all cases, suggesting that the accepted catalytic mechanism of serine proteases needs to be re-evaluated. One possible mechanism for base catalysis of Ser O gamma H proton extraction is presented.

PubMed: 3271103
DOI: 10.1107/S0108768187007559

Experimental method

X-RAY DIFFRACTION (1.65 Å)