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Histone Modification02:32

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The histone proteins have a flexible N-terminal tail extending out from the nucleosome. These histone tails are often subjected to post-translational modifications such as acetylation, methylation, phosphorylation, and ubiquitination. Particular combinations of these modifications form “histone codes” that influence the chromatin folding and tissue-specific gene expression.
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The histone proteins in the nucleosomes are post-translationally modified (PTM) to increase or decrease access to DNA. The commonly observed PTMs are methylation, acetylation, phosphorylation, and ubiquitination of lysine amino acids in the histone H3 tail region. These histone modifications have specific meaning for the cell. Hence, they are called "histone code". The protein complex involved in histone modification is termed as "reader-writer" complex.
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Proteins can undergo many types of post-translational modifications, often in response to changes in their environment. These modifications play an important role in the function and stability of these proteins. Covalently linked molecules include functional groups, such as methyl, acetyl, and phosphate groups, and also small proteins, such as ubiquitin. There are around 200 different types of covalent regulators that have been identified.
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Histone variants are the histone proteins with structural and sequence variations. These variants may be regarded as “mutant” forms that replace their canonical histone counterparts in the nucleosomes. Specific post-translational modifications on the histone variants enable further chromatin complexity and regulate tissue-specific gene expression. The most common histone variants are from histone H2A, H2B, and linker histone H1 families. However, several variants of histone H3...
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Analysis of Histone Antibody Specificity with Peptide Microarrays
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Histone Peptide Recognition by KDM5B-PHD1: A Case Study.

Suvobrata Chakravarty1, Francisca Essel1, Tao Lin1

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Understanding histone reader-peptide interactions is key for chromatin research. This study reveals how different plant homeodomain (PHD) reader proteins energetically recognize histone H3, highlighting sequence and packing effects.

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Area of Science:

  • Structural Biology
  • Epigenetics
  • Biochemistry

Background:

  • Histone modifications are crucial epigenetic marks regulating chromatin structure and function.
  • Plant homeodomain (PHD) finger proteins are key readers of histone modifications, involved in chromatin anchoring and gene regulation.
  • Understanding the energetic basis of histone peptide recognition by PHD readers is vital for designing histone-based diagnostics.

Purpose of the Study:

  • To investigate and compare the energetic contributions of residues in the recognition of unmodified histone H3 by three distinct plant homeodomain (PHD) H3K4me0 readers.
  • To elucidate the impact of specific residue substitutions and histone modifications (H3K4 methylation) on the binding affinity and stability of these reader-histone complexes.
  • To explore the role of conserved residues, interfacial packing, and sequence features in predicting PHD reader subtype binding specificities.

Main Methods:

  • Utilized biophysical techniques to probe the energetic contributions to histone peptide recognition by three PHD readers: hKDM5B-PHD1, hBAZ2A-PHD, and hAIRE-PHD1.
  • Performed site-directed mutagenesis, including H3K4A substitutions, to assess the impact on complex formation and binding thermodynamics.
  • Analyzed interfacial packing density and sequence conservation to correlate structural features with binding behavior and subtype predictability.

Main Results:

  • Significant differences in energetic contributions of residues were observed across the three reader-histone peptide complexes.
  • H3K4A substitution drastically affected hAIRE-PHD1 binding, while H3K4 methylation disrupted all three complexes.
  • The presence of specific Asp residues in the 'treble clef' region correlated with binding to H3R2 and appeared to be a subtype-specific property, though not always sufficient for binding.

Conclusions:

  • Histone peptide recognition by PHD readers is highly specific, with varying energetic contributions from individual residues.
  • Interfacial packing density plays a role in how histone modifications, like methylation, disrupt binding.
  • Sequence features, such as conserved Asp residues, can predict reader subtype binding, but additional interactions are often involved.