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The biogenesis of the major thylakoid protein complexes of the photosynthetic apparatus requires auxiliary proteins supporting individual assembly steps. Here, we identify a plant lineage specific gene,  CGL160 , whose homolog,  atp1 , co-occurs with ATP synthase subunits in an operon-like arrangement in many cyanobacteria.  Arabidopsis thaliana  T-DNA insertion mutants, which no longer accumulate the nucleus-encoded CGL160 protein, accumulate less than 25% of wild-type levels of the chloroplast ATP synthase. Severe cosmetic or growth phenotypes result under either short day or fluctuating light growth conditions, respectively, but this is ameliorated under long day constant light growth conditions where the growth, ATP synthase activity and photosynthetic electron transport of the mutants are less affected. Accumulation of other photosynthetic complexes is largely unaffected in  cgl160  mutants, suggesting that CGL160 is a specific assembly or stability factor for the CF 1 CF 0  complex. CGL160 is not found in the mature assembled complex but it does interact specifically with subunits of ATP synthase, predominantly those in the extrinsic CF 1  sub-complex. We suggest therefore that it may facilitate the assembly of CF 1  into the holocomplex.

The Thylakoid Membrane Protein CGL160 Supports CF1CF0 ATP Synthase Accumulation in Arabidopsis thaliana