Cited by 170Adenosine and Purinergic SignalingIon channel regulation and functionIon Transport and Channel Regulation

P2X7 receptor cell surface expression and cytolytic pore formation are regulated by a distal C-terminal region

Open access
Smart, Megan L., Gu, Ben, Panchal, Rekha G., Wiley, James, Cromer, Brett, Williams, David A., Petrou, Steven·2003·Journal of Biological Chemistry

Abstract

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.

The claims and statistics of this paper haven’t been checked yet.

Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.

A few free checks a day · papers already verified open instantly · results are public

Integrity signals

Registry

Crossref · 10.1074/jbc.m211094200

Cites

31 of 31 references verified0 citation errors · 0 not checkable

Statistics

Claims the paper makes

The claims and statistics of this paper haven’t been checked yet.

Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.

A few free checks a day · papers already verified open instantly · results are public

Claims other papers make about this one

Each is checked against this paper’s own text: does it say what the citing paper says it does?

Self-check

Percentages, sums and reported differences re-computed from the paper’s own numbers.

The self-check needs the paper’s full text.

Cites

Flagged first, then by citations

Research works printed but not linked: 4

  1. Khakh, B. S., Smith, W. B., Chiu, C. S., Ju, D., Davidson, N., and Lester, H. A. (2001) Proc. Natl. Acad. Sci. U. S. A. 98, 5288 -5293
  2. Worthington, R. A., Smart, M. L., Gu, B. J., Williams, D. A., Petrou, S., Wiley, J. S., and Barden, J. A. (2002) FEBS Lett. 512, 43-46
  3. Gu, B. J., Zhang, W., Worthington, R. A., Sluyter, R., Dao-Ung, P., Petrou, S., Barden, J. A., and Wiley, J. S. (2001) J. Biol. Chem. 276, 11135-11142
  4. Gu, B. J., Zhang, W. Y., Bendall, L. J., Chessell, I. P., Buell, G. N., and Wiley, J. S. (2000) Am. J. Physiol. 279, C1189 -C1197

Cited by

Sorted by citations

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
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

About these checks

Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.

Statistics and arithmetic are recomputed, not judged.

Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.

What counts as a claim ›How we measure confidence ›How we check this ›

Are you an author, or do you see a problem with this page? Request a review