1gz7: Difference between revisions
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[[Image:1gz7.gif|left|200px]] | [[Image:1gz7.gif|left|200px]] | ||
'''CRYSTAL STRUCTURE OF THE CLOSED STATE OF LIPASE 2 FROM CANDIDA RUGOSA''' | {{Structure | ||
|PDB= 1gz7 |SIZE=350|CAPTION= <scene name='initialview01'>1gz7</scene>, resolution 1.97Å | |||
|SITE= <scene name='pdbsite=AC1:Gol+Binding+Site+For+Chain+D'>AC1</scene> | |||
|LIGAND= <scene name='pdbligand=GOL:GLYCEROL'>GOL</scene> | |||
|ACTIVITY= [http://en.wikipedia.org/wiki/Triacylglycerol_lipase Triacylglycerol lipase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.1.1.3 3.1.1.3] | |||
|GENE= | |||
}} | |||
'''CRYSTAL STRUCTURE OF THE CLOSED STATE OF LIPASE 2 FROM CANDIDA RUGOSA''' | |||
==Overview== | ==Overview== | ||
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==About this Structure== | ==About this Structure== | ||
1GZ7 is a [ | 1GZ7 is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Candida_rugosa Candida rugosa]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1GZ7 OCA]. | ||
==Reference== | ==Reference== | ||
Structural insights into the lipase/esterase behavior in the Candida rugosa lipases family: crystal structure of the lipase 2 isoenzyme at 1.97A resolution., Mancheno JM, Pernas MA, Martinez MJ, Ochoa B, Rua ML, Hermoso JA, J Mol Biol. 2003 Oct 3;332(5):1059-69. PMID:[http:// | Structural insights into the lipase/esterase behavior in the Candida rugosa lipases family: crystal structure of the lipase 2 isoenzyme at 1.97A resolution., Mancheno JM, Pernas MA, Martinez MJ, Ochoa B, Rua ML, Hermoso JA, J Mol Biol. 2003 Oct 3;332(5):1059-69. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/14499609 14499609] | ||
[[Category: Candida rugosa]] | [[Category: Candida rugosa]] | ||
[[Category: Single protein]] | [[Category: Single protein]] | ||
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[[Category: hydrolase]] | [[Category: hydrolase]] | ||
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Mar 20 11:30:00 2008'' | ||
Revision as of 12:30, 20 March 2008
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| , resolution 1.97Å | |||||||
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| Sites: | |||||||
| Ligands: | |||||||
| Activity: | Triacylglycerol lipase, with EC number 3.1.1.3 | ||||||
| Coordinates: | save as pdb, mmCIF, xml | ||||||
CRYSTAL STRUCTURE OF THE CLOSED STATE OF LIPASE 2 FROM CANDIDA RUGOSA
OverviewOverview
The yeast Candida rugosa produces several closely related extracellular lipases that differ in their substrate specificity. Here, we report the crystal structure of the isoenzyme lipase 2 at 1.97A resolution in its closed conformation. Lipase 2 shows a 79.4% amino acid sequence identity with lipase 1 and 82.2% with lipase 3, which makes it relevant to compare these three isoenzymes. Despite this high level of sequence identity, structural comparisons reveal several amino acid changes affecting the flap (residue 69), the substrate-binding pocket (residues 127, 132 and 450) and the mouth of the hydrophobic tunnel (residues 296 and 344), which may be responsible for the different substrate specificity and catalytic properties of this group of enzymes. Also, these comparisons reveal two distinct regions in the hydrophobic tunnel: a phenylalanyl-rich region and an aliphatic-rich region. Whereas this last region is essentially identical in the three isoenzymes, the phenylalanyl content in the first one is specific for each lipase, resulting in a different environment of the catalytic triad residues, which probably tunes finely their lipase/esterase character. The greater structural similarity observed between the monomeric form of lipase 3 and lipase 2 concerning the above-mentioned key residues led us to propose a significant esterase activity for this last protein. This enzymatic activity has been confirmed with biochemical experiments using cholesteryl [1-14C]oleate as substrate. Surprisingly, lipase 2 is a more efficient esterase than lipase 3, showing a twofold specific activity against cholesteryl [1-14C]oleate in our experimental conditions. These results show that subtle amino acid changes within a highly conserved protein fold may produce protein variants endowed with new enzymatic properties.
About this StructureAbout this Structure
1GZ7 is a Single protein structure of sequence from Candida rugosa. Full crystallographic information is available from OCA.
ReferenceReference
Structural insights into the lipase/esterase behavior in the Candida rugosa lipases family: crystal structure of the lipase 2 isoenzyme at 1.97A resolution., Mancheno JM, Pernas MA, Martinez MJ, Ochoa B, Rua ML, Hermoso JA, J Mol Biol. 2003 Oct 3;332(5):1059-69. PMID:14499609
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