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A rare exception to the dominance of α-amino acids in biology is the β-amino acid beta alanine (3-aminopropanoic acid), which is used in plants and microorganisms in the synthesis of pantothenic acid (vitamin B 5), a component of coenzyme A. [83]
Protein primary structure is the linear sequence of amino acids in a peptide or protein. [ 1] By convention, the primary structure of a protein is reported starting from the amino -terminal (N) end to the carboxyl -terminal (C) end. Protein biosynthesis is most commonly performed by ribosomes in cells.
Conservative replacement. A conservative replacement (also called a conservative mutation or a conservative substitution) is an amino acid replacement in a protein that changes a given amino acid to a different amino acid with similar biochemical properties (e.g. charge, hydrophobicity and size ). [1] [2]
Transfer RNA. The interaction of tRNA and mRNA in protein synthesis. Transfer RNA (abbreviated tRNA and formerly referred to as sRNA, for soluble RNA[ 1]) is an adaptor molecule composed of RNA, typically 76 to 90 nucleotides in length (in eukaryotes). [ 2]
Sequence motif. A DNA sequence motif represented as a sequence logo for the LexA-binding motif. In biology, a sequence motif is a nucleotide or amino-acid sequence pattern that is widespread and usually assumed to be related to biological function of the macromolecule. For example, an N -glycosylation site motif can be defined as Asn, followed ...
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Consensus sequence. In molecular biology and bioinformatics, the consensus sequence (or canonical sequence) is the calculated sequence of most frequent residues, either nucleotide or amino acid, found at each position in a sequence alignment. It represents the results of multiple sequence alignments in which related sequences are compared to ...
Amino acid activation is a prerequisite to the initiation of translation and protein synthesis. Peptide bond formation is an endergonic, thermodynamically unfavorable process, so amino acids must be activated by covalent linkage to tRNA molecules. The energy stored within the aminoacyl-tRNA bond is used to drive peptide bond formation.
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