examples of amino acids that are non proteinic in nature?

Answer 1

homocysteine
γ-aminobutyric acid (GABA)
Thyroxine
cysteine

Answer 2

there are atleast 200 known naturally occuring amino acids in nature. out of which only 20 are known to be protenic in nature. many amino acids that are not included in tis elite list of 20 primarily occur in various organisms and serve various special functions. gama amino butyrate or GABA which serves as a neurotransmiter is one of the examples of this type. again if we look at bacteria then meso amino pimalic acid an analog of its sister compound lysine in the elite 20 list of protein forming amino acids is a non protein forming amino acid.

Answer 3

Hundreds of non-proteinogenic alpha-amino acids have been found in nature. Some of these have even been detected in meteorites, especially in a type known as carbonaceous chondrites. Microorganisms and plants can produce uncommon amino acids, which can be found in peptidic antibiotics (e.g., nisin or alamethicin). Lanthionine is a sulfide-bridged alanine dimer which is found together with unsaturated amino acids in lantibiotics (antibiotic peptides of microbial origin). 1-Aminocyclopropane-1-carboxylic acid (ACC) is a small disubstituted cyclic amino acid and a key intermediate in the production of the plant hormone ethylene. The Thyroid hormones are also alpha-amino acids.

Numerous non-standard amino acids are also biologically-important: Gamma-aminobutyric acid is another neurotransmitter, carnitine is used in lipid transport within a cell, ornithine, citrulline, homocysteine, hydroxyproline, hydroxylysine, and sarcosine.

Apart from the above non protenogenic amino acids, beta amino acids, dialkyl amino acids are also extensively found in literature.

Answer 4

Theanine is a naturally occurring non-proteinic amino acid found in tea leaves.

L-canavanine is another non-proteinic amino acid. It is an antagonic L-arginine and appears in a high content in plants such as alfalfa.

Answer 5

Canavanine (L-2-amino-4-(guanidinooxy) butyric acid)

Answer 6

amino acids are the simplest form of proteins. I don't think there are non protein forms.