Transient receptor potential family members PKD1L3 and PKD2L1 form a candidate sour taste receptor

Yoshiro Ishimaru, Hitoshi Inada, Momoka Kubota, Hanyi Zhuang, Makoto Tominaga, Hiroaki Matsunami

Research output: Contribution to journalArticlepeer-review

340 Citations (Scopus)

Abstract

Animals use their gustatory systems to evaluate the nutritious value, toxicity, sodium content, and acidity of food. Although characterization of molecular identities that receive taste chemicals is essential, molecular receptors underlying sour taste sensation remain unclear. Here, we show that two transient receptor potential (TRP) channel members, PKD1L3 and PKD2L1, are coexpressed in a subset of taste receptor cells in specific taste areas. Cells expressing these molecules are distinct from taste cells having receptors for bitter, sweet, or umami tastants. The PKD2L1 proteins are accumulated at the taste pore region, where taste chemicals are detected. PKD1L3 and PKD2L1 proteins can interact with each other, and coexpression of the PKD1L3 and PKD2L1 is necessary for their functional cell surface expression. Finally, PKD1L3 and PKD2L1 are activated by various acids when coexpressed in heterologous cells but not by other classes of tastants. These results suggest that PKD1L3 and PKD2L1 heteromers may function as sour taste receptors.

Original languageEnglish
Pages (from-to)12569-12574
Number of pages6
JournalProceedings of the National Academy of Sciences of the United States of America
Volume103
Issue number33
DOIs
Publication statusPublished - 2006 Aug 15

Keywords

  • Acid
  • Chemical senses
  • Gustation
  • Ion channel
  • Polycystic kidney disease

ASJC Scopus subject areas

  • General

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