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Updated: Jan 15, 2026

Analysis of Protein Import into Chloroplasts Isolated from Stressed Plants
Published on: November 1, 2016
Arabidopsis thaliana loss-of-function chloroplast tata mutants display an albino phenotype indicating a
Sarah Jessup1, Ruchira Sepali Mallawa Arachchi1, Chris Carrie1
1School of Biological Sciences, University of Auckland, 3 Symonds St, Auckland, 1142, New Zealand.
Abstract:
A functional mitochondrial Tat (mtTat) pathway has been confirmed in plants, but the existence or need for a TatA subunit remains unanswered. Two competing hypotheses have suggested that either plant mitochondria contain an unusual Tat pathway with no TatA contribution, or the chloroplast TatA (cpTatA) is dually targeted to chloroplasts and mitochondria. Arabidopsis thaliana cptata loss-of-function mutants display an albino phenotype consistent with a dysfunctional chloroplast Tat pathway with no quantitative impact on mitochondrial complex III biogenesis, reiterating a chloroplast-specific role of cpTatA. While these findings reject the dual-targeting hypothesis, the roles and components of the plant mitochondrial Tat pathway are yet to be fully elucidated.
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