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• W2109809944 startingPage "C1377" @default.
• W2109809944 abstract "The general phosphate need in mammalian cells is accommodated by members of the P(i) transport (PiT) family (SLC20), which use either Na(+) or H(+) to mediate inorganic phosphate (P(i)) symport. The mammalian PiT paralogs PiT1 and PiT2 are Na(+)-dependent P(i) (NaP(i)) transporters and are exploited by a group of retroviruses for cell entry. Human PiT1 and PiT2 were characterized by expression in Xenopus laevis oocytes with (32)P(i) as a traceable P(i) source. For PiT1, the Michaelis-Menten constant for P(i) was determined as 322.5 +/- 124.5 microM. PiT2 was analyzed for the first time and showed positive cooperativity in P(i) uptake with a half-maximal activity constant for P(i) of 163.5 +/- 39.8 microM. PiT1- and PiT2-mediated Na(+)-dependent P(i) uptake functions were not significantly affected by acidic and alkaline pH and displayed similar Na(+) dependency patterns. However, only PiT2 was capable of Na(+)-independent P(i) transport at acidic pH. Study of the impact of divalent cations Ca(2+) and Mg(2+) revealed that Ca(2+) was important, but not critical, for NaP(i) transport function of PiT proteins. To gain insight into the NaP(i) cotransport function, we analyzed PiT2 and a PiT2 P(i) transport knockout mutant using (22)Na(+) as a traceable Na(+) source. Na(+) was transported by PiT2 even without P(i) in the uptake medium and also when P(i) transport function was knocked out. This is the first time decoupling of P(i) from Na(+) transport has been demonstrated for a PiT family member. Moreover, the results imply that putative transmembrane amino acids E(55) and E(575) are responsible for linking P(i) import to Na(+) transport in PiT2." @default.
• W2109809944 created "2016-06-24" @default.
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• W2109809944 date "2006-12-01" @default.
• W2109809944 modified "2023-09-26" @default.
• W2109809944 title "Characterization of transport mechanisms and determinants critical for Na⁺-dependent P_isymport of the PiT family paralogs human PiT1 and PiT2" @default.
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• W2109809944 doi "https://doi.org/10.1152/ajpcell.00015.2006" @default.
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