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Publication Abstract from PubMed

Inorganic pyrophosphatase (PPase) is a ubiquitous cytosolic enzyme which catalyzes the hydrolysis of inorganic pyrophosphate (PPi) to orthophosphate (Pi). The crystal structure of inorganic pyrophosphatase from Helicobacter pylori (H-PPase) has been solved by MAD and refined to an R factor of 20.6% at 2.6 A resolution. The crystallographic asymmetric unit contains a homohexameric H-PPase arranged as a dimer of trimers. While most of the structural elements of PPases are highly conserved in H-PPase, some unique structural features are localized in the flexible loops near the active site, suggesting that the structural flexibility of these loops is required for the catalytic efficiency of PPase.

Structure of inorganic pyrophosphatase from Helicobacter pylori.,Wu CA, Lokanath NK, Kim DY, Park HJ, Hwang HY, Kim ST, Suh SW, Kim KK Acta Crystallogr D Biol Crystallogr. 2005 Nov;61(Pt 11):1459-64. Epub 2005, Oct 19. PMID:16239722^[1]

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