\pˈɛpta͡ɪd dəmˈe͡ɪn], \pˈɛptaɪd dəmˈeɪn], \p_ˈɛ_p_t_aɪ_d d_ə_m_ˈeɪ_n]\
Definitions of PEPTIDE DOMAIN
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The level of protein structure in which combinations of secondary protein structures (alpha helices, beta sheets, loop regions, and motifs) pack together to form folded shapes called domains. Disulfide bridges between cysteines in two different parts of the polypeptide chain along with other interactions between the chains play a role in the formation and stabilization of tertiary structure. Small proteins usually consist of only one domain but larger proteins may contain a number of domains connected by segments of polypeptide chain which lack regular secondary structure.
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