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XB-ART-20524
J Biol Chem 1994 Nov 25;26947:29846-54.
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Discovery and structure-function analysis of alpha-melanocyte-stimulating hormone antagonists.

Jayawickreme CK , Quillan JM , Graminski GF , Lerner MR .


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Structure-function relationships of alpha-melanocyte-stimulating hormone (alpha-MSH, alpha-melanotropin) were investigated and novel alpha-MSH receptor antagonists were identified. Based on the alpha-MSH-[5-13] peptide sequence, a multi-use peptide library consisting of 31,360 structurally different candidates was generated, and approximately 40% of the peptides were individually screened for their ability to block receptor function. This led to the identification of antagonists with a range of potencies and revealed structural requirements necessary for receptor inactivation. The most potent antagonist Met-Pro-D-Phe-Arg-D-Trp-Phe-Lys-Pro-Val-NH2 has an IC50 value of 11 +/- 7 nM. Analysis revealed that D-Trp5 and Phe6 were crucial to its antagonistic properties which could be potentiated by D-Phe3. This study demonstrates that residues in positions 5-6, 7-9, and 10 of the alpha-MSH sequence constitute crucial determinants for potent antagonist activity.

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Species referenced: Xenopus laevis