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The Histidine operon leader is an RNA element found in the bacterial histidine operon. At least 6 amino acid operons are known to be regulated by attenuation . [ 1 ] In each a leader sequence of 150–200 bp is found upstream of the first gene in the operon.
The enzyme histidine decarboxylase (EC 4.1.1.22, HDC) is transcribed on chromosome 15, region q21.1-21.2, and catalyzes the decarboxylation of histidine to form histamine. In mammals, histamine is an important biogenic amine with regulatory roles in neurotransmission , gastric acid secretion and immune response .
Histidine ball and stick model spinning. Histidine (symbol His or H) [2] is an essential amino acid that is used in the biosynthesis of proteins.It contains an α-amino group (which is in the protonated –NH 3 + form under biological conditions), a carboxylic acid group (which is in the deprotonated –COO − form under biological conditions), and an imidazole side chain (which is partially ...
Color-coding: hydrophobicity from microenvironment in folded proteins [11] The classical table/wheel of the standard genetic code is arbitrarily organized based on codon position 1. Saier, [ 12 ] following observations from, [ 13 ] showed that reorganizing the wheel based instead on codon position 2 (and reordering from UCAG to UCGA) better ...
A polyhistidine-tag, best known by the trademarked name His-tag, is an amino acid motif in proteins that typically consists of at least six histidine (His) residues, often at the N- or C-terminus of the protein. It is also known as a hexa histidine-tag, 6xHis-tag, or His6 tag.
Dementia is a terrible disease, but these 25 easiest trivia questions for seniors with dementia will perhaps provide a bright spark in the day for anyone afflicted with the illness. Click to skip ...
The Pauly reaction is a chemical test used for detecting the presence of tyrosine or histidine in proteins. It is named after German chemist Hermann Pauly , who first described the reaction. [ 1 ] When proteins containing either tyrosine or histidine are reacted with diazotized sulfanilic acid under alkaline conditions, a red color is formed by ...
In enzymology, a histidine N-acetyltransferase (EC 2.3.1.33) is an enzyme that catalyzes the chemical reaction. acetyl-CoA + L-histidine CoA + N-acetyl-L-histidine. Thus, the two substrates of this enzyme are acetyl-CoA and L-histidine, whereas its two products are CoA and N-acetyl-L-histidine.