Caenorhabditis elegans inositol 5-phosphatase homolog negatively regulates inositol 1,4,5-triphosphate signaling in ovulation.
Ovulation in Caenorhabditis elegans requires inositol 1,4,5-triphosphate (IP(3)) signaling activated by the epidermal growth factor (EGF)-receptor homolog LET-23. We generated a deletion mutant of a type I 5-phosphatase, ipp-5, and found a novel ovulation phenotype whereby the spermatheca hyperextends to engulf two oocytes per ovulation cycle. The temporal and spatial expression of IPP-5 is consistent with its proposed inhibition of IP(3) signaling in the adult spermatheca. ipp-5 acts downstream of let-23, and interacts with let-23-mediated IP(3) signaling pathway genes. We infer that IPP-5 negatively regulates IP(3) signaling to ensure proper spermathecal contraction.
Bui
Yen Kim
YK
Howard Hughes Medical Institute and Division of Biology, California Institute of Technology, Pasadena 91125, USA.
Sternberg
Paul W
PW
D000595:Amino Acid Sequence; D000818:Animals; D017173:Caenorhabditis elegans / Q000201:enzymology / Q000235:genetics / Q000378:metabolism*; D029742:Caenorhabditis elegans Proteins; D004815:Epidermal Growth Factor; D066246:ErbB Receptors / Q000378:metabolism; D015801:Helminth Proteins / Q000378:metabolism; D015544:Inositol 1,4,5-Trisphosphate / Q000378:metabolism*; D000072181:Inositol Polyphosphate 5-Phosphatases; D008969:Molecular Sequence Data; D010060:Ovulation / Q000378:metabolism*; D010744:Phosphoric Monoester Hydrolases / Q000235:genetics / Q000378:metabolism*; D016415:Sequence Alignment; D017422:Sequence Analysis, DNA; D017384:Sequence Deletion; D015398:Signal Transduction / Q000502:physiology
D029742:Caenorhabditis elegans Proteins; D015801:Helminth Proteins; C075912:Lin-3 protein, C elegans; D004815:Epidermal Growth Factor; D015544:Inositol 1,4,5-Trisphosphate; D066246:ErbB Receptors; C085873:let-23 protein, C elegans; D010744:Phosphoric Monoester Hydrolases; D000072181:Inositol Polyphosphate 5-Phosphatases