Szilák L, Moitra J, Krylov D, Vinson C
Nat Struct Biol. 1997 Feb;4(2):112-4. doi: 10.1038/nsb0297-112.
Phosphorylation of threonine destabilizes the leucine zipper of a bZIP protein by 4.6 kcal mol-1 dimer-1, which reduces DNA binding 100-fold. This decrease in stability reflects the low alpha-helix forming propensity of a phosphorylated threonine.