P2X7 receptor cell surface expression and cytolytic pore formation are regulated by a distal C-terminal region
Open accessAbstract
The importance of the cytosolic C-terminal region of the P2X7 receptor (P2X7R) is unquestioned, yet little is known about the functional domains of this region and how they may contribute to the numerous properties ascribed to this receptor. A structure-function analysis of truncated and single-residue-mutated P2X7 receptors was performed in HEK-293 cells and Xenopus oocytes. Cells expressing receptors truncated at residue 581 (of 595) have negligible ethidium ion uptake, whereas those expressing the P2X7R truncated at position 582 give wild type ethidium ion uptake suggesting that pore formation requires over 95% of the C-terminal tail. Channel function was evident even in receptors that were truncated at position 380 indicating that only a small portion of the cytosolic region is required for channel activity. Surprisingly, truncations in the region between residues 551 and 581 resulted in non-functional receptors with no detectable cell surface expression in HEK-293 cells. A more detailed analysis revealed that mutations of single residues within this region could also abolish receptor function and cell surface expression, suggesting that this region may participate in regulating the surface expression of the pore-forming P2X7R.
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Long-term activation of P2X7 results in formation of a large membrane pore and cell death.
“Long-term activation of P2X7, however, results in formation of a large membrane pore and cell death (Nuttle and Dubyak, 1994; Smart et al., 2003).”
From Understanding the Holobiont: How Microbial Metabolites Affect Human Health and Shape the Immune System (2017) · cites this paper as Smart et al., 2003
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- Authors
- Smart, M. L., Gu, B., Panchal, R. G., Wiley, J., Cromer, B., Williams, D. A., & Petrou, S.
- Affiliations
- The University of Melbourne (AU)
- The University of Sydney (AU)
- Corresponding author
- Petrou, Steven
- Venue
- Journal of Biological Chemistry
- Publisher
- Elsevier BV
- Published
- 2003-03
- Volume
- 278
- Issue
- 10
- Pages
- 8853-8860
- ISSN
- 0021-9258 (ISSN-L)
- OpenAlex
- W2048584025
- Cited by
- 170
- References
- 31
- Citations by year
- 2026: 2 · 2025: 1 · 2024: 3 · 2023: 2 · 2022: 7 · 2021: 5 · 2020: 8 · 2019: 9 · 2018: 6 · 2017: 6 · 2016: 4 · 2015: 8 · 2014: 4 · 2013: 9 · 2012: 10
- FWCI
- 7.84
- Type
- journal article
- Language
- en
- Open access
- hybrid
- doi.org
- Licence
- Locations
- Journal of Biological Chemistry (publishedVersion, cc-by)
- PubMed (publishedVersion)
- RMIT Research Repository (RMIT University Library) (submittedVersion)
- Figshare (submittedVersion)
- Funders
- Cancer Australia
- Cure Cancer Australia Foundation
- Medical Research Council
- National Health and Medical Research Council
- Topics
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Physiology › Adenosine and Purinergic Signaling
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Ion channel regulation and function
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Ion Transport and Channel Regulation
- Keywords
- P2X7 receptor, C-terminal tail, cell surface expression, pore formation, cytosolic domain, structure-function analysis, truncated receptor, single-residue mutations, receptor trafficking
- MeSH terms
- Amino Acid Sequence, Animals, Base Sequence, Cell Line, Humans, Molecular Sequence Data, Xenopus laevis, Mutagenesis, DNA Primers, Receptors, Purinergic P2, Microscopy, Confocal, Rats, Receptors, Purinergic P2X7
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