I-Peptide iyisithako se-biochemical phakathi kwe-amino acid namaprotheni. Inesisindo samangqamuzana amancane kunamaprotheni, kodwa isisindo samangqamuzana esikhudlwana kune-amino acid. Kuwucezu lwamaprotheni. Okusho ukuthi, ukusuka kwangaphezulu kwamabili noma kuya kwamashumi amabili e-amino acid peptide bond polymerization ibe i-peptide, bese isuka kuma-peptide amaningi anamaketango asemaceleni i-polymerization ibe iphrotheni. I-amino acid ayikwazi ukubizwa ngokuthi i-peptide, kufanele ibe ngaphezu kwama-amino acid amabili axhunywe yinhlanganisela yeketango le-peptide ukuze kuthiwe i-peptide; Ama-amino acid amaningi ahlanganiswe ndawonye awabizwa ngokuthi ama-peptide; Ama-amino acid kufanele axhunywe ngamabhondi e-peptide, enze "iketanga le-amino acid", "uchungechunge lwe-amino acid", uchungechunge lwama-amino acid lungabizwa ngokuthi i-peptide. .