Five Arabidopsis peroxin 11 homologs individually promote peroxisome elongation, duplication or aggregation

Journal of Cell Science
Matthew J Lingard, Richard N Trelease

Abstract

Pex11 homologs and dynamin-related proteins uniquely regulate peroxisome division (cell-cycle-dependent duplication) and proliferation (cell-cycle-independent multiplication). Arabidopsis plants possess five Pex11 homologs designated in this study as AtPex11a, -b, -c, -d and -e. Transcripts for four isoforms were found in Arabidopsis plant parts and in cells in suspension culture; by contrast, AtPex11a transcripts were found only in developing siliques. Within 2.5 hours after biolistic bombardments, myc-tagged or GFP-tagged AtPex11 a, -b, -c, -d and -e individually sorted from the cytosol directly to peroxisomes; none trafficked indirectly through the endoplasmic reticulum. Both termini of myc-tagged AtPex11 b, -c, -d and -e faced the cytosol, whereas the N- and C-termini of myc-AtPex11a faced the cytosol and matrix, respectively. In AtPex11a- or AtPex11e-transformed cells, peroxisomes doubled in number. Those peroxisomes bearing myc-AtPex11a, but not myc-AtPex11e, elongated prior to duplication. In cells transformed with AtPex11c or AtPex11d, peroxisomes elongated without subsequent fission. In AtPex11b-transformed cells, peroxisomes were aggregated and rounded. A C-terminal dilysine motif, present in AtPex11c, -d and -e, was ...Continue Reading

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