Title : Structure and activity of rat pancreatic lipase-related protein 2 - Roussel_1998_J.Biol.Chem_273_32121
Author(s) : Roussel A , Yang Y , Ferrato F , Verger R , Cambillau C , Lowe M
Ref : Journal of Biological Chemistry , 273 :32121 , 1998
Abstract :

The pancreas expresses several members of the lipase gene family including pancreatic triglyceride lipase (PTL) and two homologous proteins, pancreatic lipase-related proteins 1 and 2 (PLRP1 and PLRP2). Despite their similar amino acid sequences, PTL, PLRP1, and PLRP2 differ in important kinetic properties. PLRP1 has no known activity. PTL and PLRP2 differ in substrate specificity, bile acid inhibition, colipase requirement, and interfacial activation. To begin understanding the structural explanations for these functional differences, we solved the crystal structure of rat (r)PLRP2 and further characterized its kinetic properties. The 1.8 A structure of rPLRP2, like the tertiary structure of human PTL, has a globular N-terminal domain and a beta-sandwich C-terminal domain. The lid domain occupied the closed position, suggesting that rPLRP2 should show interfacial activation. When we reexamined this issue with tripropionin as substrate, rPLRP2 exhibited interfacial activation. Because the active site topology of rPLRP2 resembled that of human PTL, we predicted and demonstrated that the lipase inhibitors E600 and tetrahydrolipstatin inhibit rPLRP2. Although PTL and rPLRP2 have similar active sites, rPLRP2 has a broader substrate specificity that we confirmed using a monolayer technique. With this assay, we showed for the first time that rPLRP2 prefers phosphatidylglycerol and ethanolamine over phosphatidylcholine. In summary, we confirmed and extended the observation that PLRP2 lipases have a broader substrate specificity than PTL, we demonstrated that PLRP2 lipases show interfacial activation, and we solved the first crystal structure of a PLRP2 lipase that contains a lid domain.

PubMedSearch : Roussel_1998_J.Biol.Chem_273_32121
PubMedID: 9822688
Gene_locus related to this paper: ratno-4plip

Related information

Gene_locus ratno-4plip
Structure ratno-4plip    1BU8

Citations formats

Roussel A, Yang Y, Ferrato F, Verger R, Cambillau C, Lowe M (1998)
Structure and activity of rat pancreatic lipase-related protein 2
Journal of Biological Chemistry 273 :32121

Roussel A, Yang Y, Ferrato F, Verger R, Cambillau C, Lowe M (1998)
Journal of Biological Chemistry 273 :32121