2xzb

From Proteopedia

Pig Gastric H,K-ATPase with bound BeF and SCH28080

Structural highlights

2xzb is a 2 chain structure with sequence from Sus scrofa. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Method:	Electron crystallography, Resolution 7Å
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

ATP4A_PIG Catalyzes the hydrolysis of ATP coupled with the exchange of H(+) and K(+) ions across the plasma membrane. Responsible for acid production in the stomach.

Publication Abstract from PubMed

Acid-related gastric diseases are associated with disorder of digestive tract acidification. The gastric proton pump, H(+),K(+)-ATPase, exports H(+) in exchange for luminal K(+) to generate a highly acidic environment in the stomach, and is a main target for acid suppressants. Here, we report the three-dimensional structure of gastric H(+),K(+)-ATPase with bound SCH28080, a representative K(+)-competitive acid blocker, at 7 A resolution based on electron crystallography of two-dimensional crystals. The density of the bound SCH28080 is found near transmembrane (TM) helices 4, 5 and 6, in the luminal cavity. The SCH28080-binding site is formed by the rearrangement of TM helices, which is in turn transmitted to the cytoplasmic domains, resulting in a luminal-open conformation. These results represent the first structural evidence for a binding site of an acid suppressant on H(+),K(+)-ATPase, and the conformational change induced by this class of drugs.

Conformational rearrangement of gastric H(+),K(+)-ATPase induced by an acid suppressant.,Abe K, Tani K, Fujiyoshi Y Nat Commun. 2011 Jan;2(1):155. PMID:21224846^[1]

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

References

↑ Abe K, Tani K, Fujiyoshi Y. Conformational rearrangement of gastric H(+),K(+)-ATPase induced by an acid suppressant. Nat Commun. 2011 Jan;2(1):155. PMID:21224846 doi:10.1038/ncomms1154