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Protein Modifications in the RER01:26

Protein Modifications in the RER

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Modification of secretory and transmembrane proteins entering the rough ER begins in the ER lumen. These modifications aid in protein folding and stabilize the acquired tertiary structure. Protein modifications in the rough ER co-occur at different stages of protein folding.
Broadly, these modifications can be categorized into four main categories — glycosylation, formation of disulfide bonds, assembly of protein subunits, and specific proteolytic cleavages like removal of signal...
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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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Behavioral approaches have often been criticized for ignoring mental processes and focusing solely on observable behavior. However, these approaches provide an optimistic perspective for individuals seeking to change their behaviors. Rather than concentrating on intrinsic personality traits, behavioral approaches suggest that even longstanding habits can be modified by changing the reward contingencies that maintain them.
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Chromatin Modification in iPS Cells01:32

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Chromatin modification alters gene expression; therefore, scientists can add histone-modifying enzymes, histone variants, and chromatin remodeling complexes to somatic cells to aid reprogramming into pluripotent stem (iPS) cells.
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Updated: Jan 20, 2026

Utilizing a Comprehensive Immunoprecipitation Enrichment System to Identify an Endogenous Post-translational Modification Profile for Target Proteins
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Phosphotyrosine - a new protein modification.

Tony Hunter1

  • 1Salk Institute, San Diego, CA 92138, U.S.A.

Trends in Biochemical Sciences
|August 16, 2019
PubMed
Summary
This summary is machine-generated.

Tyrosine protein kinases modify proteins through tyrosine phosphorylation. Aberrant activity of these kinases is linked to cancer development and activated by cellular growth factors.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Oncology

Background:

  • Tyrosine protein kinases are enzymes catalyzing tyrosine residue phosphorylation.
  • This modification is a critical regulatory mechanism in cellular signaling.
  • Dysregulation of tyrosine kinases is implicated in various diseases, including cancer.

Purpose of the Study:

  • To elucidate the role of tyrosine protein kinases in protein modification.
  • To investigate the connection between tyrosine kinases and viral oncogenesis.
  • To understand the impact of cellular growth factors on tyrosine kinase activity.

Main Methods:

  • Enzyme assays to measure kinase activity.
  • Analysis of protein phosphorylation patterns.
  • Studies on viral transforming proteins.
  • Investigation of growth factor signaling pathways.

Main Results:

  • Tyrosine protein kinases perform tyrosine phosphorylation, a novel protein modification.
  • Viral transforming proteins possess tyrosine kinase activity, crucial for malignant transformation.
  • Cellular growth factors activate intracellular tyrosine protein kinases.

Conclusions:

  • Tyrosine phosphorylation is a key regulatory process mediated by tyrosine protein kinases.
  • Aberrant tyrosine kinase activity driven by viral oncoproteins contributes to cancer.
  • Growth factor-induced activation of tyrosine kinases plays a role in cellular proliferation and transformation.