Signalling specificity of Ser/Thr protein kinases through docking-site-mediated interactions.
Biondi RM, Nebreda AR, Biochem J, 2003 May 15 - link

High resolution crystal structure of the human PDK1 catalytic domain defines the regulatory phosphopeptide docking site.
Biondi RM, Komander D, Thomas CC, Lizcano JM, Deak M, Alessi DR, van Aalten DM, EMBO J, 2002 Aug 15 - link

A 3-phosphoinositide-dependent protein kinase-1 (PDK1) docking site is required for the phosphorylation of protein kinase Czeta (PKCzeta ) and PKC-related kinase 2 by PDK1.
Balendran A, Biondi RM, Cheung PC, Casamayor A, Deak M, Alessi DR, J Biol Chem, 2000 Jul 7 - link