DOI: 10.1152/ajpcell.1999.276.4.c969. Cloning of Trp1β isoform from rat brain: immunodetection and localization of the endogenous Trp1 protein

Cloning of Trp1β isoform from rat brain: immunodetection and localization of the endogenous Trp1 protein

10.1152/ajpcell.1999.276.4.c969

Crossref journal-article

American Physiological Society

American Journal of Physiology-Cell Physiology (24)

Abstract

The Trp gene product has been proposed as a candidate protein for the store-operated Ca2+channel, but the Trp protein(s) has not been identified in any nonexcitable cell. We report here the cloning of a rat brain Trp1β cDNA and detection and immunolocalization of the endogenous and expressed Trp1 protein. A 400-bp product, with >95% homology to mouse Trp1, was amplified from rat submandibular gland RNA. Rat-specific primers were used for cloning of a full-length rat brain Trp1β cDNA (rTrp1), encoding a protein of 759 amino acids. Northern blot analysis demonstrated the transcript in several rat and mouse tissues. The peptide (amino acids 523–536) was used to generate a polyclonal antiserum. The affinity-purified antibody 1) immunoprecipitated human Trp1 (hTrp1) from transfected HEK-293 cells, 2) reacted with a protein of ∼92 kDa, but not with hTrp3, in membranes of hTrp3-expressing HEK-293 cells, and 3) reacted with proteins of 92 and 56 kDa in human and rat brain membranes. Confocal microscopy and cell fractionation demonstrated that endogenous and expressed hTrp1 and expressed hTrp3 proteins were localized in the plasma membrane of HEK-293 cells, consistent with their proposed role in Ca2+ influx. The data demonstrate for the first time the presence of Trp1 protein in a nonexcitable cell.

Bibliography

Wang, W., OâConnell, B., Dykeman, R., Sakai, T., Delporte, C., Swaim, W., Zhu, X., Birnbaumer, L., & Ambudkar, I. S. (1999). Cloning of Trp1Î² isoform from rat brain: immunodetection and localization of the endogenous Trp1 protein. American Journal of Physiology-Cell Physiology, 276(4), C969âC979.

Authors 9

Weiching Wang (first)
Brian O’Connell (additional)
Raymond Dykeman (additional)
Takayuki Sakai (additional)
Christine Delporte (additional)
William Swaim (additional)
Xi Zhu (additional)
Lutz Birnbaumer (additional)
Indu S. Ambudkar (additional)

References 32 Referenced 161

Dates

Type	When
Created	7 years, 8 months ago (Dec. 24, 2017, 5:14 p.m.)
Deposited	1 year, 2 months ago (June 17, 2024, 3:25 p.m.)
Indexed	3 months, 1 week ago (May 20, 2025, 9:18 a.m.)
Issued	26 years, 4 months ago (April 1, 1999)
Published	26 years, 4 months ago (April 1, 1999)
Published Print	26 years, 4 months ago (April 1, 1999)

Funders 0

None

BibTeX

@article{Wang_1999, title={Cloning of Trp1β isoform from rat brain: immunodetection and localization of the endogenous Trp1 protein}, volume={276}, ISSN={1522-1563}, url={http://dx.doi.org/10.1152/ajpcell.1999.276.4.c969}, DOI={10.1152/ajpcell.1999.276.4.c969}, number={4}, journal={American Journal of Physiology-Cell Physiology}, publisher={American Physiological Society}, author={Wang, Weiching and O’Connell, Brian and Dykeman, Raymond and Sakai, Takayuki and Delporte, Christine and Swaim, William and Zhu, Xi and Birnbaumer, Lutz and Ambudkar, Indu S.}, year={1999}, month=apr, pages={C969–C979} }

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  "abstract": "<jats:p> The Trp gene product has been proposed as a candidate protein for the store-operated Ca<jats:sup>2+</jats:sup>channel, but the Trp protein(s) has not been identified in any nonexcitable cell. We report here the cloning of a rat brain Trp1\u03b2 cDNA and detection and immunolocalization of the endogenous and expressed Trp1 protein. A 400-bp product, with &gt;95% homology to mouse Trp1, was amplified from rat submandibular gland RNA. Rat-specific primers were used for cloning of a full-length rat brain Trp1\u03b2 cDNA (rTrp1), encoding a protein of 759 amino acids. Northern blot analysis demonstrated the transcript in several rat and mouse tissues. The peptide (amino acids 523\u2013536) was used to generate a polyclonal antiserum. The affinity-purified antibody 1) immunoprecipitated human Trp1 (hTrp1) from transfected HEK-293 cells, 2) reacted with a protein of \u223c92 kDa, but not with hTrp3, in membranes of hTrp3-expressing HEK-293 cells, and 3) reacted with proteins of 92 and 56 kDa in human and rat brain membranes. Confocal microscopy and cell fractionation demonstrated that endogenous and expressed hTrp1 and expressed hTrp3 proteins were localized in the plasma membrane of HEK-293 cells, consistent with their proposed role in Ca<jats:sup>2+</jats:sup> influx. The data demonstrate for the first time the presence of Trp1 protein in a nonexcitable cell. </jats:p>",
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