6A12 image
Entry Detail
PDB ID:
6A12
Keywords:
HYDROLASE
Title:
X-ray structure of lipase from Geobacillus thermoleovorans
Biological Source:
Source Organism:
Geobacillus thermoleovorans
Host Organism:
Escherichia coli BL21(DE3)
PDB Version:
Deposition Date:
2018-06-06
Release Date:
2018-06-20
Method Details:
Experimental Method:
X-RAY DIFFRACTION
Resolution:
2.15 Å
R-Value Free:
0.22
R-Value Work:
0.17
R-Value Observed:
0.17
Space Group:
P 21 21 21
6A12 validation report
Macromolecular Entities
Protein Blast
Polymer Type:polypeptide(L)
Description:Lipase
Chain IDs:A
Chain Length:389
Number of Molecules:1
Biological Source:Geobacillus thermoleovorans
UniProt ID:Q8L1V2
Ligand Molecules
CA
ZN
Primary Citation
X-ray structure and characterization of a thermostable lipase from Geobacillus thermoleovorans.
Biochem. Biophys. Res. Commun. 508 145 151 (2019)
PMID: 30471860 DOI: 10.1016/j.bbrc.2018.11.105

Abstact

Thermo-alkalophilic bacterium, Geobacillus thermoleovorans secrets many enzymes including a 43 kDa extracellular lipase. Significant thermostability, organic solvent stability and wide substrate preferences for hydrolysis drew our attention to solve its structure by crystallography. The structure was solved by molecular replacement method and refined up to 2.14 Å resolution. Structure of the lipase showed an alpha-beta fold with 19 α-helices and 10 β-sheets. The active site remains covered by a lid. One calcium and one zinc atom was found in the crystal. The structure showed a major difference (rmsd 5.6 Å) from its closest homolog in the amino acid region 191 to 203. Thermal unfolding of the lipase showed that the lipase is highly stable with Tm of 76 °C. 13C NMR spectra of products upon triglyceride hydrolysate revealed that the lipase hydrolyses at both sn-1 and sn-2 positions with equal efficiency.

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Primary Citation of related structures
6A12