The import competence of a peroxisomal membrane protein is determined by Pex19p before the docking step.
Pinto MP, Grou CP, Alencastre IS, Oliveira ME, Sa-Miranda C, Fransen M, Azevedo JE, J Biol Chem, 2006 Nov 10 - link

Potential role for Pex19p in assembly of PTS-receptor docking complexes.
Fransen M, Vastiau I, Brees C, Brys V, Mannaerts GP, Van Veldhoven PP, J Biol Chem, 2004 Mar 26 - link

Identification of a human PTS1 receptor docking protein directly required for peroxisomal protein import.
Fransen M, Terlecky SR, Subramani S, Proc Natl Acad Sci U S A, 1998 Jul 7 - link