CHEMISTRY GLOSSARY
Results 1–2 of 2 for histidin
histidine → histidin
Histidine is an electrically charged amino acids with basic side chains. It is an essential amino acid, which means that humans cannot synthesize it, so it must be ingested. Histidine is perhaps the most common and versatile catalytic residue in proteins. The imidazole sidechain of histidine has a pKa of approximately 6.0. This means that, at physiologically relevant pH values, relatively small shifts in pH will change its average charge. The unprotonated imidazole is nucleophilic and can serve as a general base, while the protonated form can serve as a general acid. In addition, it is often a ligand for transition metal ions such as iron and zinc.
- Abbreviations: His, H
- IUPAC name: 2-amino-3-(1H-imidazol-5-yl)propanoic acid
- Molecular formula: C6H9N3O2
- Molecular weight: 155.15 g/mol
lysine → lizin
Lysine is an electrically charged amino acids with basic side chains. Lysine is a base, as are arginine and histidine. The amino group is highly reactive and often participates in reactions at the active centers of enzymes. Lysine plays an important role in coordinating negatively charged ligands. It is an essential amino acid, which means that humans cannot synthesize it, so it must be ingested.
- Abbreviations: Lys, K
- IUPAC name: 2,6-diaminohexanoic acid
- Molecular formula: C6H14N2O2
- Molecular weight: 146.19 g/mol
Citing this page:
Generalic, Eni. "Histidin." Croatian-English Chemistry Dictionary & Glossary. 29 June 2022. KTF-Split. {Date of access}. <https://glossary.periodni.com>.
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