The smallest known eukaryotic genomes encode a protein gene: towards an understanding of nucleomorph functions
Hofmann, C.J.B. | Rensing, S.A. | Hauber, M.M. | Martin, W.F. | Muller, S.B. | Couch, J. | McFadden, G.I. | Igloi, G.L. | Maier, U.G.
Cryptomonads are unicellular algae with plastids surrounded by four membranes. Between the two pairs of membranes lies a periplastidal compartment that harbours a DNA-containing organelle, termed the nucleomorph. The nucleomorph is the vestigial nucleus of a phototrophic, eukaryotic endosymbiont. Subcloning of parts of one nucleomorph chromosome revealed a gene coding for an Hsp70 protein. We demonstrate the expression of this nucleomorph protein-coding gene and present a model for protein transport from the host to the endosymbiont compartment.
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