Activated MEKK1 then phosphorylates and activates SAPK/Erk kinase (SEK1), also known as MKK4 or Jun kinase kinase (JNKK) on serine and threonine residues at positions 257 and 261, respectively.
Zon, LI, Yan, M, Woodgett, JR, Dai, T, Templeton, DJ, Kyriakis, JM, Deak, JC
Davis, RJ
protein serine/threonine kinase activity of p-T1400,T1412-MAP3K1 [cytosol]
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