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1lap

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{{STRUCTURE_1lap| PDB=1lap | SCENE= }}
{{STRUCTURE_1lap| PDB=1lap | SCENE= }}
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'''MOLECULAR STRUCTURE OF LEUCINE AMINOPEPTIDASE AT 2.7-ANGSTROMS RESOLUTION'''
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===MOLECULAR STRUCTURE OF LEUCINE AMINOPEPTIDASE AT 2.7-ANGSTROMS RESOLUTION===
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==Overview==
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The three-dimensional structure of bovine lens leucine aminopeptidase (EC 3.4.11.1) complexed with bestatin, a slow-binding inhibitor, has been solved to 3.0-A resolution by the multiple isomorphous replacement method with phase combination and density modification. In addition, the structure of the isomorphous native enzyme has been refined at 2.7-A resolution, and the current crystallographic R factor is 0.169 for a model that includes the two zinc ions and all 487 amino acid residues comprising the asymmetric unit. The enzyme is physiologically active as a hexamer, which has 32 symmetry and is triangular in shape with a triangle edge length of 115 A and maximal thickness of 90 A. The monomers are crystallographically equivalent and each is folded into two unequal alpha/beta domains connected by an alpha-helix to give a comma-like shape with approximate maximal dimensions of 90 x 55 x 55 A3. The secondary structural composition is 40% alpha-helix and 19% beta-strand. The N-terminal domain (160 amino acids) mediates trimer-trimer interactions and does not appear to participate directly in catalysis. The C-terminal domain (327 amino acids) is responsible for catalysis and binds the two zinc ions, which are 2.88 A apart. The pair of metal ions is located near the edge of an eight-stranded, saddle-shaped beta-sheet. One zinc ion is coordinated by carboxylate oxygen atoms of Asp-255, Asp-332, and Glu-334 and the carbonyl oxygen of Asp-332. The other zinc ion is coordinated by the carboxylate oxygen atoms of Asp-255, Asp-273, and Glu-334. The active site also contains two positively charged residues, Lys-250 and Arg-336. The six active sites are themselves located in the interior of the hexamer, where they line a disk-shaped cavity of radius 15 A and thickness 10 A. Access to this cavity is provided by solvent channels that run along the twofold symmetry axes.
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(as it appears on PubMed at http://www.pubmed.gov), where 2395881 is the PubMed ID number.
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{{ABSTRACT_PUBMED_2395881}}
==About this Structure==
==About this Structure==
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[[Category: Lipscomb, W N.]]
[[Category: Lipscomb, W N.]]
[[Category: Taylor, A.]]
[[Category: Taylor, A.]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May 2 23:43:45 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Wed Jul 2 12:08:17 2008''

Revision as of 09:08, 2 July 2008

Image:1lap.png

Template:STRUCTURE 1lap

MOLECULAR STRUCTURE OF LEUCINE AMINOPEPTIDASE AT 2.7-ANGSTROMS RESOLUTION

Template:ABSTRACT PUBMED 2395881

About this Structure

1LAP is a Single protein structure of sequence from Bos taurus. Full crystallographic information is available from OCA.

Reference

Molecular structure of leucine aminopeptidase at 2.7-A resolution., Burley SK, David PR, Taylor A, Lipscomb WN, Proc Natl Acad Sci U S A. 1990 Sep;87(17):6878-82. PMID:2395881

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