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- W1555297725 abstract "Abstract The melanotropin (MSH) receptor of mouse B16-F1 melanoma cells was characterized by photoaffinity cross-linking, using a potent alpha-MSH photolabel, [norleucine4, D-phenylalanine7, 1'-(2-nitro-4-azidophenylsulfenyl)-tryptophan9]-alpha-melanotropin (Naps-MSH). Its monoiodinated form, 125I-Naps-MSH, displayed a approximately 6.5-fold higher biological activity than alpha-MSH. Scatchard analysis of the saturation curves with 125I-Naps-MSH revealed approximately 20,000 receptors/B16-F1 cell and an apparent KD of approximately 0.3 nM. Analysis of the cross-linked MSH receptor by sodium dodecyl sulfate-polyacrylamide gel electrophoresis showed that a photolabeled band of approximately 45 kDa occurs in B16-F1, B16-F10, and Cloudman S91 mouse melanoma, as well as in human D10 and 205 melanoma but not in non-melanoma cells. The labeled 45-kDa protein had an isoelectric point of 4.5-4.9 as determined by two-dimensional gel electrophoresis. Treatment of the labeled 45-kDa protein of B16-F1 cell membranes by neuraminidase shifted the band to approximately 42 kDa. A similar band of about 42 kDa was also observed after receptor labeling of B16-W4 cells, a cell line with a decreased number of terminal N-linked neuraminyl residues. These results indicate that the labeled 45-kDa glycoprotein contains terminal sialic acid residues, explaining the low pI of this protein, and that it is characteristic for melanoma cells and hence part of the MSH receptor." @default.
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- W1555297725 date "1989-08-01" @default.
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- W1555297725 title "The Receptor for α-Melanotropin of Mouse and Human Melanoma Cells" @default.
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- W1555297725 doi "https://doi.org/10.1016/s0021-9258(18)71674-8" @default.
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