NAADP is one of the most potent calcium mobilizing second messengers. Only recently, two NAADP-binding proteins have been identified: HN1L/JPT2 and LSM12. Further, ASPDH was suggested as a less selective binding partner. Apart from this newly uncovered link, little is known about the shared mechanisms between these proteins. The aim of this review is to assess potential functional connections between NAADP and its binding proteins. We here give a description of two major links. For one, HN1L/JPT2 and LSM12 both have potent oncogenic functions in several cancer types. Second, they are involved in similar cellular pathways in both cancer and immunity.
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http://dx.doi.org/10.1016/j.bbamcr.2023.119531 | DOI Listing |
J Vis Exp
October 2024
The Calcium Signalling Group, Department of Biochemistry and Molecular Cell Biology, University Medical Centre Hamburg-Eppendorf;
ACS Chem Biol
August 2024
Department of Medicinal and Biological Chemistry, College of Pharmacy and Pharmaceutical Sciences, University of Toledo, 3000 Arlington Avenue, Toledo, Ohio 43614, United States.
Calcium ions (Ca) play a vital role as intracellular messengers, regulating essential cellular processes. Nicotinic acid adenine dinucleotide phosphate (NAADP) serves as a potent second messenger, responsible for releasing Ca in both mammals and echinoderms. Despite identification of two human NAADP receptor proteins, their counterparts in sea urchins remain elusive.
View Article and Find Full Text PDFSci Signal
August 2023
Department of Cell and Developmental Biology, University College London, Gower Street, London WC1E 6BT, UK.
TPC2 is a pathophysiologically relevant lysosomal ion channel that is activated directly by the phosphoinositide PI(3,5)P and indirectly by the calcium ion (Ca)-mobilizing molecule NAADP through accessory proteins that associate with the channel. TPC2 toggles between PI(3,5)P-induced, sodium ion (Na)-selective and NAADP-induced, Ca-permeable states in response to these cues. To address the molecular basis of polymodal gating and ion-selectivity switching, we investigated the mechanism by which NAADP and its synthetic functional agonist, TPC2-A1-N, induced Ca release through TPC2 in human cells.
View Article and Find Full Text PDFSci Signal
August 2023
Department of Cell Biology, Neurobiology and Anatomy, Medical College of Wisconsin, 8701 Watertown Plank Road, Milwaukee, WI 53226, USA.
The second messenger nicotinic acid adenine dinucleotide phosphate (NAADP) evokes calcium ion (Ca) release from endosomes and lysosomes by activating two-pore channels (TPCs) on these organelles. Rather than directly binding to TPCs, NAADP associates with proteins that indirectly confer NAADP sensitivity to the TPC complex. We investigated whether and how the NAADP-binding proteins Jupiter microtubule-associated homolog 2 (JPT2) and like-Sm protein 12 (LSM12) contributed to NAADP-TPC-Ca signaling in human cells.
View Article and Find Full Text PDFBiochim Biophys Acta Mol Cell Res
October 2023
The Calcium Signaling Group, Dept. of Biochemistry and Molecular Cell Biology, University Medical Center Hamburg-Eppendorf (UKE), Hamburg, Germany.
NAADP is one of the most potent calcium mobilizing second messengers. Only recently, two NAADP-binding proteins have been identified: HN1L/JPT2 and LSM12. Further, ASPDH was suggested as a less selective binding partner.
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