Nardini_2000_J.Biol.Chem_275_31219

Reference

Title : Crystal structure of pseudomonas aeruginosa lipase in the open conformation. The prototype for family I.1 of bacterial lipases - Nardini_2000_J.Biol.Chem_275_31219
Author(s) : Nardini M , Lang DA , Liebeton K , Jaeger KE , Dijkstra BW
Ref : Journal of Biological Chemistry , 275 :31219 , 2000
Abstract :

The x-ray structure of the lipase from Pseudomonas aeruginosa PAO1 has been determined at 2.54 A resolution. It is the first structure of a member of homology family I.1 of bacterial lipases. The structure shows a variant of the alpha/beta hydrolase fold, with Ser(82), Asp(229), and His(251) as the catalytic triad residues. Compared with the "canonical" alpha/beta hydrolase fold, the first two beta-strands and one alpha-helix (alphaE) are not present. The absence of helix alphaE allows the formation of a stabilizing intramolecular disulfide bridge. The loop containing His(251) is stabilized by an octahedrally coordinated calcium ion. On top of the active site a lid subdomain is in an open conformation, making the catalytic cleft accessible from the solvent region. A triacylglycerol analogue is covalently bound to Ser(82) in the active site, demonstrating the position of the oxyanion hole and of the three pockets that accommodate the sn-1, sn-2, and sn-3 fatty acid chains. The inhibited enzyme can be thought to mimic the structure of the tetrahedral intermediate that occurs during the acylation step of the reaction. Analysis of the binding mode of the inhibitor suggests that the size of the acyl pocket and the size and interactions of the sn-2 binding pocket are the predominant determinants of the regio- and enantio-preference of the enzyme.

PubMedSearch : Nardini_2000_J.Biol.Chem_275_31219
PubMedID: 10893416
Gene_locus related to this paper: pseae-llipa

Related information

Inhibitor OCP
Gene_locus OCP    pseae-llipa
Family OCP    pseae-llipa    Bacterial_lip_FamI.1
Structure OCP    pseae-llipa    Bacterial_lip_FamI.1    1EX9

Citations formats

Nardini M, Lang DA, Liebeton K, Jaeger KE, Dijkstra BW (2000)
Crystal structure of pseudomonas aeruginosa lipase in the open conformation. The prototype for family I.1 of bacterial lipases
Journal of Biological Chemistry 275 :31219

Nardini M, Lang DA, Liebeton K, Jaeger KE, Dijkstra BW (2000)
Journal of Biological Chemistry 275 :31219