Student or educator? Sign up with your school email and get 6 months of Pro free.
Cited by 201

The DOI matches its Crossref record; 6 of the 6 references it cites were found in a registry or an index.

A single amino acid substitution results in a retinoblastoma protein defective in phosphorylation and oncoprotein binding.

Open access
Kaye, F J, Kratzke, R A, Gerster, J L, Horowitz, J M·1990·Proceedings of the National Academy of Sciences

Abstract

We have previously identified a small-cell lung cancer cell line (NCI-H209) that expresses an aberrant, underphosphorylated form of the retinoblastoma protein RB1. Molecular analysis of RB1 mRNA from this cell line revealed a single point mutation within exon 21 that resulted in a nonconservative amino acid substitution (cysteine to phenylalanine) at codon 706. Stable expression of this mutant RB1 cDNA in a human cell line lacking endogenous RB1 demonstrated that this amino acid change was sufficient to inhibit phosphorylation. In addition, this cysteine-to-phenylalanine substitution also resulted in loss of RB1 binding to the simian virus 40 large tumor and adenovirus E1A transforming proteins. These results confirm the importance of exon 21 coding sequences and suggest that the cysteine residue at codon 706 may play a role in achieving a specific protein conformation essential for protein-protein interactions.

Overview

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 · 10.1073/pnas.87.17.6922

Cites

6 of 6 references verified0 citation errors · 0 not checkable

Statistics

Verification

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

Self-check

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

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

Citations

Cites

Show all 6 references

Cited by

See all 201

Metadata

Authors
Kaye, F. J., Kratzke, R. A., Gerster, J. L., & Horowitz, J. M.
Venue
Proceedings of the National Academy of Sciences
Published
1990-09
Volume
87
Issue
17
Pages
6922-6926
ISSN
  • 0027-8424 (ISSN-L)
  • 1091-6490
OpenAlex
W2027416462
Cited by
201
References
6
FWCI
8.24
Type
journal article
Language
en
Open access
green

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

How to cite

Cite CoChat for the checks on this page, and the paper for its own findings.

This page
CoChat. (2026). Citation check: A single amino acid substitution results in a retinoblastoma protein defective in phosphorylation and oncoprotein binding. https://app.cochat.ai/papers/10.1073/pnas.87.17.6922
The paper
Kaye, F. J., Kratzke, R. A., Gerster, J. L., & Horowitz, J. M. (1990). A single amino acid substitution results in a retinoblastoma protein defective in phosphorylation and oncoprotein binding. Proceedings of the National Academy of Sciences. https://doi.org/10.1073/pnas.87.17.6922

Data sources

Bibliographic data: Semantic Scholar, OpenAlex, Crossref.

Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).

Semantic Scholar’s data is described in: Kinney, R., et al. (2023). The Semantic Scholar Open Data Platform. arXiv:2301.10140.