View source for 1cgi

[[Image:1cgi.gif|left|200px]]

 {{Structure
|PDB= 1cgi |SIZE=350|CAPTION= <scene name='initialview01'>1cgi</scene>, resolution 2.3&Aring;
|SITE= 
|LIGAND= 
|ACTIVITY= 
|GENE= 
|DOMAIN=
|RELATEDENTRY=
|RESOURCES=<span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1cgi FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1cgi OCA], [http://www.ebi.ac.uk/pdbsum/1cgi PDBsum], [http://www.rcsb.org/pdb/explore.do?structureId=1cgi RCSB]</span>
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'''THREE-DIMENSIONAL STRUCTURE OF THE COMPLEXES BETWEEN BOVINE CHYMOTRYPSINOGEN*A AND TWO RECOMBINANT VARIANTS OF HUMAN PANCREATIC SECRETORY TRYPSIN INHIBITOR (KAZAL-TYPE)'''


==Overview==
Variants of the human pancreatic secretory trypsin inhibitor (PSTI) have been created during a protein design project to generate a high-affinity inhibitor with respect to some serine proteases other than trypsin. Two modified versions of human PSTI with high affinity for chymotrypsin were crystallized as a complex with chymotrypsinogen. Both crystallize isomorphously in space group P4(1)2(1)2 with lattice constants a = 84.4 A, c = 86.7 A and diffract to 2.3 A resolution. The structure was solved by molecular replacement. The final R-value after refinement with 8.0 to 2.3 A resolution data was 19.5% for both complexes after inclusion of about 50 bound water molecules. The overall three-dimensional structure of PSTI is similar to the structure of porcine PSTI in the trypsinogen complex (1TGS). Small differences in the relative orientation of the binding loop and the core of the inhibitors indicate flexible adaptation to the proteases. The chymotrypsinogen part of the complex is similar to chymotrypsin. After refolding induced by binding of the inhibitor the root-mean-square difference of the active site residues A186 to A195 and A217 to A222 compared to chymotrypsin was 0.26 A.

==About this Structure==
1CGI is a [[Protein complex]] structure of sequences from [http://en.wikipedia.org/wiki/Bos_taurus Bos taurus] and [http://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1CGI OCA]. 

==Reference==
Three-dimensional structure of the complexes between bovine chymotrypsinogen A and two recombinant variants of human pancreatic secretory trypsin inhibitor (Kazal-type)., Hecht HJ, Szardenings M, Collins J, Schomburg D, J Mol Biol. 1991 Aug 5;220(3):711-22. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/1870127 1870127]
[[Category: Bos taurus]]
[[Category: Homo sapiens]]
[[Category: Protein complex]]
[[Category: Collins, J.]]
[[Category: Hecht, H J.]]
[[Category: Schomburg, D.]]
[[Category: Szardenings, M.]]
[[Category: serine protease/inhibitor complex]]

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