1qix

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[[Image:1qix.jpg|left|200px]]
[[Image:1qix.jpg|left|200px]]
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{{Structure
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|PDB= 1qix |SIZE=350|CAPTION= <scene name='initialview01'>1qix</scene>, resolution 1.9&Aring;
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The line below this paragraph, containing "STRUCTURE_1qix", creates the "Structure Box" on the page.
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|SITE=
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You may change the PDB parameter (which sets the PDB file loaded into the applet)
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|LIGAND= <scene name='pdbligand=CA:CALCIUM+ION'>CA</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</scene>
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or the SCENE parameter (which sets the initial scene displayed when the page is loaded),
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|ACTIVITY= <span class='plainlinks'>[http://en.wikipedia.org/wiki/Pancreatic_elastase Pancreatic elastase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.4.21.36 3.4.21.36] </span>
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or leave the SCENE parameter empty for the default display.
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|GENE=
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|DOMAIN=
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{{STRUCTURE_1qix| PDB=1qix | SCENE= }}
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|RELATEDENTRY=
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|RESOURCES=<span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1qix FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1qix OCA], [http://www.ebi.ac.uk/pdbsum/1qix PDBsum], [http://www.rcsb.org/pdb/explore.do?structureId=1qix RCSB]</span>
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}}
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'''PORCINE PANCREATIC ELASTASE COMPLEXED WITH HUMAN BETA-CASOMORPHIN-7'''
'''PORCINE PANCREATIC ELASTASE COMPLEXED WITH HUMAN BETA-CASOMORPHIN-7'''
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[[Category: Schofield, C J.]]
[[Category: Schofield, C J.]]
[[Category: Wilmouth, R C.]]
[[Category: Wilmouth, R C.]]
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[[Category: hydrolase (serine proteinase)]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 06:19:51 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun Mar 30 23:14:16 2008''
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Revision as of 03:19, 3 May 2008

Image:1qix.jpg

Template:STRUCTURE 1qix

PORCINE PANCREATIC ELASTASE COMPLEXED WITH HUMAN BETA-CASOMORPHIN-7


Overview

Mass spectrometric screening reveals that an unmodified natural heptapeptide--human beta-casomorphin-7, an internal sequence of human beta-casein that possesses opioid-like activity--reacts with porcine pancreatic elastase to form an unusually stable acyl-enzyme complex at low pH. X-ray crystallographic analysis (to 1.9 A resolution) at pH 5 shows continuous electron density linking the C-terminal isoleucine of beta-casomorphin-7 to Ser 195 through an ester bond. The structure reveals a well defined water molecule (Wat 317), equidistant between the carbon of the ester carbonyl and N epsilon 2 of His 57. Deprotonation of Wat 317 will produce a hydroxide ion positioned to attack the ester carbonyl through the favoured Burgi-Dunitz trajectory.

About this Structure

1QIX is a Single protein structure of sequence from Homo sapiens and Sus scrofa. Full crystallographic information is available from OCA.

Reference

Structure of a specific acyl-enzyme complex formed between beta-casomorphin-7 and porcine pancreatic elastase., Wilmouth RC, Clifton IJ, Robinson CV, Roach PL, Aplin RT, Westwood NJ, Hajdu J, Schofield CJ, Nat Struct Biol. 1997 Jun;4(6):456-62. PMID:9187653 Page seeded by OCA on Sat May 3 06:19:51 2008

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