Identification of a novel class of mammalian phosphoinositol-specific phospholipase C enzymes

Alan J Stewart, Joy Mukherjee, Scott J Roberts, Douglas Lester, Colin Farquharson

Research output: Contribution to journalArticlepeer-review


Phosphoinositol (PhoIns)-specific phospholipase C enzymes (PLCs) are central to the inositol lipid signaling pathways and contribute to intracellular Ca2+ release and protein kinase C activation. Five distinct classes of PhoIns-specific PLCs are known to exist in mammals, which are activated by membrane receptor-mediated events. Here we have identified a sixth class of PhoIns-specific PLC with a novel domain structure, which we have termed PLC-eta. Two putative PLC-eta enzymes were identified in humans and in mice. Sequence analysis revealed that residues implicated in substrate binding and catalysis from other PhoIns-specific PLCs are conserved in the novel enzymes. PLC-eta enzymes are most closely related to the PLC-delta class and share a close evolutionary relationship with other PLC isozymes. EST analysis and RT-PCR data suggest that PLC-eta enzymes are expressed in several cell types and, by analogy with other mammalian PhoIns-specific PLCs, are likely to be involved in signal transduction pathways.
Original languageEnglish
Pages (from-to)117-21
Number of pages5
JournalInternational Journal of Molecular Medicine
Issue number1
Publication statusPublished - Jan 2005


  • Amino Acid Sequence
  • Animals
  • Gene Expression Profiling
  • Humans
  • Mammals
  • Mice
  • Molecular Sequence Data
  • Phosphatidylinositol Diacylglycerol-Lyase
  • Phylogeny
  • RNA, Messenger
  • Sequence Alignment


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