nichtproteinogene

Nichtproteinogen is a German term that translates to "non-proteinogenic" in English. It is most commonly used in the context of amino acids. Proteinogenic amino acids are the 20 standard amino acids that are encoded by the genetic code and used by ribosomes to synthesize proteins. In contrast, nichtproteinogene amino acids are those that are not incorporated into proteins during translation. These can include amino acids that are naturally occurring but have a different structure, or they can be synthetic amino acids.

Nichtproteinogene amino acids can have various roles in biological systems. Some are intermediates in metabolic pathways, while others function as neurotransmitters or hormones. For example, ornithine and citrulline are important in the urea cycle but are not incorporated into proteins. GABA (gamma-aminobutyric acid) is a crucial inhibitory neurotransmitter derived from glutamate, another proteinogenic amino acid, but GABA itself is not proteinogenic.

The study of nichtproteinogene amino acids is important in biochemistry and pharmacology. Some have been developed as drugs or are used as building blocks for synthesizing peptides with specific therapeutic properties. Research into these non-standard amino acids continues to expand our understanding of biological processes and opens avenues for novel applications in medicine and biotechnology.