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FEBS Lett. 1999 Oct 8;459(2):227-9.

Antibodies against pex14p block ATP-independent binding of matrix proteins to peroxisomes in vitro.

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Centre for Plant Sciences, Leeds Institute of Plant Biotechnology and Agriculture, University of Leeds, Leeds, UK.


The membrane protein Pex14p is a key component of the protein import machinery of peroxisomes. Antibodies raised against human Pex14p recognise a 66 kDa protein in sunflower glyoxysomes (HaPex14p) and immunoprecipitate in vitro-translated Arabidopsis Pex14p (AtPex14p). These antibodies inhibit the ATP-independent binding to sunflower peroxisome membranes of peroxisome targeting signal type (PTS) 1- and PTS2-targeted matrix proteins, but not an integral membrane protein. These results suggest that Pex14p functions before the ATP-dependent step of peroxisome assembly.

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