Histones are characterized by numerous posttranslational modifications that influence gene transcription.
组蛋白的特点是大量的翻译后修饰，这些修饰可以影响基因转录。
Posttranslational modification
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Post-translational modification
![Post-translational modification of insulin. At the top, the ribosome translates a mRNA sequence into a protein, insulin, and passes the protein through the endoplasmic reticulum, where it is cut, folded and held in shape by disulfide (-S-S-) bonds. Then the protein passes through the golgi apparatus, where it is packaged into a vesicle. In the vesicle, more parts are cut off, and it turns into mature insulin.](/Images/godic/202502/04/Insulin_path.svg0735.png")
![The genetic code diagram[8] showing the amino acid residues as target of modification.](/Images/godic/202502/04/GeneticCode22.svg0735.png")
Post-translational modification (PTM) refers to the covalent and generally enzymatic modification of proteins during or after protein biosynthesis. Proteins are synthesized by ribosomes translating mRNA into polypeptide chains, which may then undergo PTM to form the mature protein product. PTMs are important components in cell signaling.
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