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Vol. 10, Issue 6, 1745-1761, June 1999





*Department of Biology, University of California, San Diego, La
Jolla, California 92093-0322; and §Laboratory of Electron
Microscopy, Genentech, South San Francisco, California 94080
We report the cloning and characterization of Pichia
pastoris PEX19 by complementation of a peroxisome-deficient
mutant strain. Import of peroxisomal targeting signal 1- and
2-containing peroxisomal matrix proteins is defective in
pex19 mutants. PEX19 encodes a hydrophilic 299-amino acid protein with sequence similarity to Saccharomyces cerevisiae Pex19p and human and Chinese
hamster PxF, all farnesylated proteins, as well as hypothetical
proteins from Caenorhabditis elegans and
Schizosaccharomyces pombe. The farnesylation consensus
is conserved in PpPex19p but dispensable for function and appears
unmodified under the conditions tested. Pex19p localizes predominantly
to the cytosolic fraction. Biochemical and two-hybrid analyses
confirmed that Pex19p interacts with Pex3p, as seen in S.
cerevisiae, but unexpectedly also with Pex10p. Two-hybrid analysis demonstrated that the amino-terminal 42 amino acids of Pex19p
interact with the carboxyl-terminal 335 amino acids of Pex3p. In
addition, the extreme carboxyl terminus of Pex19p (67 amino acids) is
required for interaction with the amino-terminal 380 amino acids of
Pex10p. Biochemical and immunofluorescence microscopy analyses of
pex19
cells identified the membrane protein Pex3p in
peroxisome remnants that were not previously observed in S.
cerevisiae. These small vesicular and tubular (early) remnants are morphologically distinct from other Pppex mutant
(late) remnants, suggesting that Pex19p functions at an early stage of
peroxisome biogenesis.
These authors contributed equally.
Present addresses: (K.N.F.) University of
Groningen, Department of Microbiology, 9751 NN Haren, The Netherlands;
(T.J.W.) Gist-Brocades, Food Specialities Division, 2600 MA Delft, The Netherlands; (G.H.L.) University of Bonn, Institute for Anatomy, 53115 Bonn, Germany.
Corresponding author: E-mail address:
ssubramani{at}ucsd.edu.
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