You can find more information about H+-pump (PPi) V-type; K+-independent using the following links:

PFID PFID Old Formal Annotation PlasmoDB TDR Targets Subcellular Localization Affecting Drugs
Drug Name PubMed Articles (year of publication)
PF3D7_1235200 PFL1700c V-type K+-independent H+-translocating inorganic pyrophosphatase, VP2 PlasmoDB TDR
Expasy - NiceZime View
Brenda - The Comprehensive Enzyme Information System