3UUE: Crystal Structure Of Mono- And Diacylglycerol Lipase From Malassezia Globosa

Citation:
Abstract
Most lipases contain a lid domain to shield the hydrophobic binding site from the water environment. The lid, mostly in helical form, can undergo a conformational change to expose the active cleft during the interfacial activation. Here we report the crystal structures of Malassezia globosa LIP1 (SMG1) at 1.45 and 2.60 A resolution in two crystal forms. The structures present SMG1 in its closed form, with a novel lid in loop conformation. SMG1 is one of the few members in the fungal lipase family that has been found to be strictly specific for mono- and diacylglycerol. To date, the mechanism for this substrate specificity remains largely unknown. To investigate the substrate binding properties, we built a model of SMG1 in open conformation. Based on this model, we found that the two bulky hydrophobic residues adjacent to the catalytic site and the N-terminal hinge region of the lid both may act as steric hindrances for triacylglycerols binding. These unique structural features of SMG1 will provide a better understanding on the substrate specificity of mono- and diacylglycerol lipases and a platform for further functional study of this enzyme.
PDB ID: 3UUEDownload
MMDB ID: 99005
PDB Deposition Date: 2011/11/28
Updated in MMDB: 2013/07
Experimental Method:
x-ray diffraction
Resolution: 1.45  Å
Source Organism:
Similar Structures:
Biological Unit for 3UUE: monomeric; determined by author and by software (PISA)
Molecular Components in 3UUE
Label Count Molecule
Protein (1 molecule)
1
Lip1, Secretory Lipase (Family 3)
Molecule annotation
Chemicals (11 molecules)
1
2
2
1
3
3
4
1
5
4
* Click molecule labels to explore molecular sequence information.

Citing MMDB
.