1gz7

File:1gz7.gif

spinqualitylabelsall models 1gz7, resolution 1.97Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image

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 with GOL as ligand. Active as Triacylglycerol lipase, with EC number 3.1.1.3 Structure known Active Site: AC1. 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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