Cited by 282Genomics and Chromatin DynamicsT-cell and B-cell ImmunologyNF-κB Signaling Pathways

Effect of PU.1 phosphorylation on interaction with NF-EM5 and transcriptional activation

Pongubala, J., Van Beveren, C, Nagulapalli, S, Klemsz, M., McKercher, Maki, R., Atchison, M.·1993·Science

Abstract

PU.1 recruits the binding of a second B cell-restricted nuclear factor, NF-EM5, to a DNA site in the immunoglobulin kappa 3' enhancer. DNA binding by NF-EM5 requires a protein-protein interaction with PU.1 and specific DNA contacts. Dephosphorylated PU.1 bound to DNA but did not interact with NF-EM5. Analysis of serine-to-alanine mutations in PU.1 indicated that serine 148 (Ser148) is required for protein-protein interaction. PU.1 produced in bacteria did not interact with NF-EM5. Phosphorylation of bacterially produced PU.1 by purified casein kinase II modified it to a form that interacted with NF-EM5 and that recruited NF-EM5 to bind to DNA. Phosphopeptide analysis of bacterially produced PU.1 suggested that Ser148 is phosphorylated by casein kinase II. This site is also phosphorylated in vivo. Expression of wild-type PU.1 increased expression of a reporter construct containing the PU.1 and NF-EM5 binding sites nearly sixfold, whereas the Ser148 mutant form only weakly activated transcription. These results demonstrate that phosphorylation of PU.1 at Ser148 is necessary for interaction with NF-EM5 and suggest that this phosphorylation can regulate transcriptional activity.

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Crossref · 10.1126/science.8456286

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Authors
Pongubala, J., Van Beveren, C., Nagulapalli, S., Klemsz, M., McKercher, Maki, R., & Atchison, M.
Affiliations
  • University of Pennsylvania (US)
  • Sanford Burnham Prebys Medical Discovery Institute (US)
Venue
Science
Published
1993-03-12
Volume
259
Issue
5101
Pages
1622-1625
ISSN
  • 0036-8075 (ISSN-L)
  • 1095-9203
OpenAlex
W2093339251
Cited by
282
References
23
Citations by year
2026: 2 · 2025: 1 · 2023: 4 · 2022: 4 · 2021: 1 · 2020: 2 · 2018: 1 · 2017: 1 · 2015: 2 · 2013: 1 · 2012: 7
FWCI
10.26
Type
journal article
Language
en
Open access
closed
Locations
  • Science (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Genomics and Chromatin Dynamics
  • Life Sciences › Immunology and Microbiology › Immunology › T-cell and B-cell Immunology
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cancer Research › NF-κB Signaling Pathways
Keywords
PU.1, protein phosphorylation, casein kinase 2, protein-protein interaction, transcriptional activation, transcriptional regulation
MeSH terms
Animals, B-Lymphocytes, Base Sequence, Cell Line, Cell Nucleus, DNA-Binding Proteins, Enhancer Elements, Genetic

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