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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

A mutant lactogenic hormone binds, but does not activate, the prolactin receptor.

We have generated mutations in mouse placental lactogen II, a hormone in the PRL/GH family that binds to the PRL receptor, to investigate the role of the conserved cysteine residues in hormone function. Disruption of the small C-terminal disulfide loop did not significantly alter hormone activity. Substitution of serine for cysteine-51, which prevents formation of the large disulfide loop, results in a protein equivalent to placental lactogen II in receptor-binding activity; however, this mutant protein is not mitogenic in an assay for lactogenic hormones. These results indicate that PRL receptor occupancy and activation are distinct events.[1]


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