PreprintCited by 134Genomics and Chromatin DynamicsDiffusion and Search DynamicsProtein Structure and Dynamics

Oct-1 POU domain-DNA interactions: cooperative binding of isolated subdomains and effects of covalent linkage.

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Klemm, J D, Pabo, C O·1996·Genes & Development

Abstract

Structural and biochemical studies of Oct-1 POU domain-DNA interactions have raised important questions about cooperativity and the role of the linker connecting the POU-specific domain and the POU homeo domain. To analyze these interactions, we have studied binding of the isolated domains. Surprisingly, we find that two unlinked polypeptides corresponding to the POU-specific domain and the POU homeo domain bind cooperatively to the octamer site and have a coupling energy of 1.6 kcal/mole. We suggest that overlapping DNA contacts near the center of the octamer site may be the source of this cooperativity, as there are no protein-protein contacts between the domains in the crystal structure of the Oct-1 POU domain-DNA complex. These studies also have allowed us to describe the thermodynamic contribution of the linker (present in the intact POU domain) in terms of an effective concentration (3.6 mM). The broader implications for understanding cooperativity in protein-DNA recognition and gene regulation are discussed.

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Crossref · 10.1101/gad.10.1.27

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  • On lower-affinity sites, the linker's chelating effect may lower entropic cost, allowing PipPU to bind as efficiently as wild-type proteins.

    “On lower affinity sites, however, the chelating effect provided by the linker may lower the overall entropic cost associated with binding, allowing PipPU to bind as efficiently as the wildtype proteins”

    From Assembly requirements of PU.1–Pip (IRF‐4) activator complexes: inhibiting function in vivo using fused dimers (1999) · cites this paper as Klemm and Pabo, 1996

    The “Contribution of the linker to cooperative binding” section (page unavailable) says the linker produces a chelate effect and reduces the entropic cost of complex formation. The paper studies Oct-1 POU-domain binding; it does not establish that PipPU binds lower-affinity sites as efficiently as wild-type proteins. (LLM, conf=0.87)

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Authors
Klemm, J. D., & Pabo, C. O.
Affiliations
Massachusetts Institute of Technology (US)
Venue
Genes & Development
Published
1996-01-01
Volume
10
Issue
1
Pages
27-36
ISSN
  • 0890-9369 (ISSN-L)
  • 1549-5477
OpenAlex
W2160488560
Cited by
134
References
20
Citations by year
2024: 2 · 2022: 1 · 2021: 3 · 2020: 5 · 2019: 3 · 2018: 1 · 2017: 4 · 2016: 4 · 2015: 8 · 2014: 5 · 2013: 5 · 2012: 1
Type
posted content
Language
en
Open access
Locations
  • Genes & Development (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • Howard Hughes Medical Institute
  • National Institutes of Health (5r01gm031471-16, GM31471)
  • National Institute of General Medical Sciences (GM-31471)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Genomics and Chromatin Dynamics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Diffusion and Search Dynamics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Protein Structure and Dynamics
Keywords
Oct-1, POU domain, protein-DNA interactions, cooperative binding, binding thermodynamics, protein-DNA recognition, gene expression regulation
MeSH terms
Base Sequence, Binding Sites, Deoxyribonuclease I, DNA-Binding Proteins, Genes, Homeobox, Models, Molecular, Molecular Sequence Data, Mutation, Peptide Fragments, Thermodynamics, Transcription Factors, Homeodomain Proteins, DNA Footprinting, Octamer Transcription Factor-1, Host Cell Factor C1

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