Functional relationship of serine 90 phosphorylation and the surrounding putative salt bridge in bovine prolactin

The biological activity of bovine prolactin (PRL) is reduced by in vivo phosphorylation of serine 90 (S90) that is located within a putative N+4 salt bridge (R89 and D93). We substituted hydrophobic, polar, or acidic residues for S90 and/or replaced members of the putative R89/D93 salt bridge to det...

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