TwoaminoAcid connection isDipeptide, and so onTripeptideTetrapeptide...... Less than 10amino acid compositionScale ofOligopeptide(Small moleculePeptides), more than ten are polypeptides, and more than fifty are called peptidesprotein。macromoleculeMost proteins are long peptide chains that make up more than 100 amino acids.The peptide bond is amino acidα - carboxylDehydrated and condensed with the α - amino acid of another adjacent amino acidcovalent bondTherefore, there are free α - amino or α - carboxyl groups at both ends of the peptide chain, which are respectively calledAmino terminalorCarboxyl terminal。With compositionamino acidThe nature and function of units vary greatly[1]。
Refers toamino acidWhen connecting to form proteins, eachaminoThe one connected between acidsChemical bond, calledPeptide bond。In fact, peptide bond is formed by one amino acid when two amino acids are connectedcarboxyl(- COOH) and another amino acid (- NHtwo)InterconnectedChemical bond[-NH-CO-]。
Water molecule
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In twoamino acidConnection formationPeptide bondA molecule will be separated (or formed) whenwater。That is, how many peptide bonds are formed, how much molecular water will be released.So how many peptide bonds are contained in a peptide chain, how many water molecules will come out.
protein
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One peptide chain contains multiplePeptide bondA protein molecule consists of one or more peptide chains.
Ring state
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If it is in the ring state, it will form a peptide chain.