The DOI matches its Crossref record.
Identification of phosphotyrosine as a product of epidermal growth factor-activated protein kinase in A-431 cell membranes.
Open accessAbstract
Epidermal growth factor (EGF)-enhanced protein kinase activity in plasma membrane preparations of A-431 human epidermoid carcinoma cells was shown to involve the phosphorylation of tyrosine residues. Phosphotyrosine was detected in both endogenous membrane proteins and in histone when added as an exogenous protein substrate. The major phosphorylated amino acid in partial acid hydrolysates of 32P-labeled A-431 membranes was identified as phosphotyrosine on the basis of its identical behavior to authentic phosphotyrosine on paper electrophoresis and thin layer chromatography; its 5-dimethylaminonaphthalene-1-sulfonyl (dansyl) derivative was indistinguishable from that of the authentic compound. Only traces, if any, of phosphoserine or phosphothreonine were detected. [32P]Phosphotyrosine was also detected in pronase digests of 32P-labeled membrane proteins. The EGF receptor . protein kinase complex, which was solubilized with Triton X-100 and purified by EGF affinity chromatography, was shown to phosphorylate tyrosine residues of the isolated membrane protein.
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.
Integrity signals
Registry
Cites
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.
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
Cited by
Ullrich, A., Coussens, L., Hayflick, J. S., Dull, T. J., Gray, A., Tam, A. W., Lee, J., Yarden, Y., Libermann, T. A., Schlessinger, J., et al. (1984) · Nature · doi:10.1038/309418a0 · Cited by 2,752
Epidermal Growth Factor Receptor Cell Proliferation Signaling Pathways
Wee, P., & Wang, Z. (2017) · Cancers · doi:10.3390/cancers9050052 · Cited by 2,027
An allosteric mechanism for activation of the kinase domain of epidermal growth factor receptor
Zhang, X., Gureasko, J., Shen, K., Cole, P. A., & Kuriyan, J. (2006) · Cell · doi:10.1016/j.cell.2006.05.013 · Cited by 1,650
Sherr, C. J., Rettenmier, C. W., Sacca, R., Roussel, M. F., Look, A. T., & Stanley, E. R. (1985) · Cell · doi:10.1016/s0092-8674(85)80047-7 · Cited by 1,540
The discovery of receptor tyrosine kinases: targets for cancer therapy
Gschwind, A., Fischer, O. M., & Ullrich, A. (2004) · Nature Reviews Cancer · doi:10.1038/nrc1360 · Cited by 1,227
Metadata
- Authors
- Ushiro, H., & Cohen, S.
- Venue
- Journal of Biological Chemistry
- Publisher
- Elsevier BV
- Published
- 1980-09
- Volume
- 255
- Issue
- 18
- Pages
- 8363-8365
- ISSN
- 0021-9258 (ISSN-L)
- OpenAlex
- W1524333424
- Cited by
- 1,169
- References
- 0
- FWCI
- 32.41
- Type
- journal article
- Language
- en
- Open access
- hybrid
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: Identification of phosphotyrosine as a product of epidermal growth factor-activated protein kinase in A-431 cell membranes. https://app.cochat.ai/papers/10.1016/s0021-9258(18)43497-7
- The paper
- Ushiro, H., & Cohen, S. (1980). Identification of phosphotyrosine as a product of epidermal growth factor-activated protein kinase in A-431 cell membranes. Journal of Biological Chemistry. https://doi.org/10.1016/s0021-9258(18)43497-7
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.
