8jp0

Structural highlights

Function

NAC1_HUMAN Mediates the exchange of one Ca(2+) ion against three to four Na(+) ions across the cell membrane, and thereby contributes to the regulation of cytoplasmic Ca(2+) levels and Ca(2+)-dependent cellular processes (PubMed:1374913, PubMed:11241183, PubMed:1476165). Contributes to Ca(2+) transport during excitation-contraction coupling in muscle (PubMed:1374913, PubMed:11241183, PubMed:1476165). In a first phase, voltage-gated channels mediate the rapid increase of cytoplasmic Ca(2+) levels due to release of Ca(2+) stores from the endoplasmic reticulum (PubMed:1374913, PubMed:11241183, PubMed:1476165). SLC8A1 mediates the export of Ca(2+) from the cell during the next phase, so that cytoplasmic Ca(2+) levels rapidly return to baseline (PubMed:1374913, PubMed:11241183, PubMed:1476165). Required for normal embryonic heart development and the onset of heart contractions (By similarity).[UniProtKB:P70414]^{[1] [2] [3]}

References

1. ↑ Van Eylen F, Bollen A, Herchuelz A. NCX1 Na/Ca exchanger splice variants in pancreatic islet cells. J Endocrinol. 2001 Mar;168(3):517-26. PMID:11241183 doi:10.1677/joe.0.1680517
2. ↑ Komuro I, Wenninger KE, Philipson KD, Izumo S. Molecular cloning and characterization of the human cardiac Na+/Ca2+ exchanger cDNA. Proc Natl Acad Sci U S A. 1992 May 15;89(10):4769-73. PMID:1374913 doi:10.1073/pnas.89.10.4769
3. ↑ Kofuji P, Hadley RW, Kieval RS, Lederer WJ, Schulze DH. Expression of the Na-Ca exchanger in diverse tissues: a study using the cloned human cardiac Na-Ca exchanger. Am J Physiol. 1992 Dec;263(6 Pt 1):C1241-9. PMID:1476165 doi:10.1152/ajpcell.1992.263.6.C1241