Al-Obeidi F, O'Connor SD, Job C, Hruby VJ, Pettitt BM. NMR and quenched molecular dynamics studies of superpotent linear and cyclic alpha-melanotropins.
THE JOURNAL OF PEPTIDE RESEARCH : OFFICIAL JOURNAL OF THE AMERICAN PEPTIDE SOCIETY 1998;
51:420-31. [PMID:
9650716 DOI:
10.1111/j.1399-3011.1998.tb00640.x]
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Abstract
Conformational searching, computer simulations, synthesis and NMR are used on a variety of alpha melanocyte-stimulating hormone (alpha-MSH) analogues to understand the physical characteristics required for biological potency. Peptides I (Ac-[Nle4,Asp5,D-Phe7,Lys10]alpha-MSH(4-10)-NH2), II (Ac-c[Nle4,Asp5,D-Phe7,Lys10]alpha-MSH(4-10)-NH2) and III (Ac-[Nle4,Asp5,D-Phe7,Dap10]alpha-MSH(4-10)-NH2 all show very similar conformational properties (backbone and side-chain torsional angles), and all display high biological potencies. The modeling results for these compounds are supported by the NMR data. Peptide IV (Ac-c[Nle4,Asp5,D-Phe7,Dap10]alpha-MSH(4-10)-NH2) appears to have a markedly different conformation and has decreased biological potency.
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