3est
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(New page: 200px<br /> <applet load="3est" size="450" color="white" frame="true" align="right" spinBox="true" caption="3est, resolution 1.65Å" /> '''STRUCTURE OF NATIVE...)
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Revision as of 07:03, 18 November 2007
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STRUCTURE OF NATIVE PORCINE PANCREATIC ELASTASE AT 1.65 ANGSTROMS RESOLUTION
Overview
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.
About this Structure
3EST is a Single protein structure of sequence from Sus scrofa with CA and SO4 as ligands. The following page contains interesting information on the relation of 3EST with [Trypsin]. Active as Pancreatic elastase, with EC number 3.4.21.36 Full crystallographic information is available from OCA.
Reference
Structure of native porcine pancreatic elastase at 1.65 A resolutions., Meyer E, Cole G, Radhakrishnan R, Epp O, Acta Crystallogr B. 1988 Feb 1;44 ( Pt 1):26-38. PMID:3271103
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