CLONING AND EXPRESSION OF A CDNA-ENCODING A BRAIN-SPECIFIC NA+-DEPENDENT INORGANIC-PHOSPHATE COTRANSPORTER

被引:266
|
作者
NI, BH
ROSTECK, PR
NADI, NS
PAUL, SM
机构
[1] ELI LILLY & CO,LILLY CORP CTR,LILLY RES LABS,INDIANAPOLIS,IN 46285
[2] NIMH,CLIN NEUROSCI BRANCH,MOLEC PHARMACOL SECT,BETHESDA,MD 20892
[3] NIMH,CELL BIOL LAB,BETHESDA,MD 20892
关键词
NEURONAL PHOSPHATE TRANSPORT; ATP BIOSYNTHESIS; INTRACELLULAR PHOSPHATE;
D O I
10.1073/pnas.91.12.5607
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
We have isolated a brain-specific cDNA that encodes a Na+-dependent inorganic phosphate (P-i) cotransporter (BNPI). The nucleotide sequence of BNPI predicts a protein of 560 amino acids with 6-8 putative transmembrane-spanning segments that is approximate to 32% identical to the rabbit kidney Na+-dependent P-i cotransporter. Expression of BNPI mRNA in Xenopus oocytes results in Na+-dependent P-i transport similar to that reported for the recombinantly expressed or native kidney Na+-dependent cotransporter. RNA blot analysis reveals that BNPI mRNA is expressed predominantly (if not exclusively) in brain, and in situ hybridization histochemistry reveals BNPI transcripts in neurons of the cerebral cortex, hippocampus, and cerebellum. Furthermore, we have confirmed the presence of saturable Na+-dependent P-i cotransport in cultured cerebellar granule cells. Together, these data demonstrate the presence of a specific neuronal Na+-dependent transport system for P-i in brain.
引用
收藏
页码:5607 / 5611
页数:5
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