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Updated: Dec 6, 2025
14:40
Expression Analysis of Mammalian Linker-histone Subtypes
Published on: March 19, 2012
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How Human H1 Histone Recognizes DNA
Olesya P Luzhetskaya1, Sergey E Sedykh1, Georgy A Nevinsky1
1Institute of Chemical Biology and Fundamental Medicine, SD of Russian Academy of Sciences, 8 Lavrentiev Ave., 630090 Novosibirsk, Russia.
Molecules (Basel, Switzerland)
|October 8, 2020
Summary
Linker H1 histone binds DNA weakly, with affinity increasing with length for single strands. It primarily contacts phosphate groups, not bases, in DNA recognition.
Area of Science:
- Molecular Biology
- Biochemistry
- Genetics
Background:
- Linker H1 histone is a key component of eukaryotic chromatin.
- Understanding DNA recognition by histones is crucial for chromatin structure and function.
Purpose of the Study:
- To analyze DNA recognition patterns of free H1 histone.
- To determine the affinity of H1 histone for various single- and double-stranded oligonucleotides.
Main Methods:
- Ligand complexity method with stepwise increase.
- Competition assays using labeled oligonucleotides.
- Nitrocellulose membrane filter binding assays.
Main Results:
- H1 histone's minimal ligands are mononucleotides (dNMPs) with a Kd of 1.30 × 10^-2 M.
- Affinity for single-stranded DNA increases monotonically with length (factor of ~3.0 per nucleotide).
- Double-stranded DNA affinity is only slightly higher than single-stranded DNA; H1 contacts phosphates, not bases.
Conclusions:
- H1 histone exhibits length-dependent DNA binding, primarily through phosphate interactions.
- The binding mechanism involves weak, additive contacts with the DNA backbone.
- These findings provide insights into histone-DNA interactions within chromatin.
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