3hlh

From Proteopedia

Diisopropyl fluorophosphatase (DFPase), active site mutants

Structural highlights

3hlh is a 4 chain structure with sequence from Loligo vulgaris. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Method:	X-ray diffraction, Resolution 1.8Å
Ligands:
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

DFPA_LOLVU Biological function and substrate unknown. However, it is capable of acting on phosphorus anhydride bonds (such as phosphorus-halide and phosphorus-cyanide) in organophosphorus compounds (including nerve gases).^[1]

Evolutionary Conservation

Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf.

Publication Abstract from PubMed

Diisopropyl fluorophosphatase (DFPase) from Loligo vulgaris is an efficient and robust biocatalyst for the hydrolysis of a range of highly toxic organophosphorus compounds including the nerve agents sarin, soman, and cyclosarin. In contrast to the substrate diisopropyl fluorophosphate (DFP) the nerve agents possess an asymmetric phosphorus atom, which leads to pairs of enantiomers that display markedly different toxicities. Wild-type DFPase prefers the less toxic stereoisomers of the substrates which leads to slower detoxification despite rapid hydrolysis. Enzyme engineering efforts based on rational design yielded two quadruple enzyme mutants with reversed enantioselectivity and overall enhanced activity against tested nerve agents. The reversed stereochemical preference is explained through modeling studies and the crystal structures of the two mutants. Using the engineered mutants in combination with wild-type DFPase leads to significantly enhanced activity and detoxification, which is especially important for personal decontamination. Our findings may also be of relevance for the structurally related enzyme human paraoxonase (PON), which is of considerable interest as a potential catalytic in vivo scavenger in case of organophosphorus poisoning.

Reversed enantioselectivity of diisopropyl fluorophosphatase against organophosphorus nerve agents by rational design.,Melzer M, Chen JC, Heidenreich A, Gab J, Koller M, Kehe K, Blum MM J Am Chem Soc. 2009 Dec 2;131(47):17226-32. PMID:19894712^[2]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

References

↑ Katsemi V, Lucke C, Koepke J, Lohr F, Maurer S, Fritzsch G, Ruterjans H. Mutational and structural studies of the diisopropylfluorophosphatase from Loligo vulgaris shed new light on the catalytic mechanism of the enzyme. Biochemistry. 2005 Jun 28;44(25):9022-33. PMID:15966726 doi:10.1021/bi0500675
↑ Melzer M, Chen JC, Heidenreich A, Gab J, Koller M, Kehe K, Blum MM. Reversed enantioselectivity of diisopropyl fluorophosphatase against organophosphorus nerve agents by rational design. J Am Chem Soc. 2009 Dec 2;131(47):17226-32. PMID:19894712 doi:10.1021/ja905444g