An open reading frame with significant similarity to the secY gene of Escherichia coli has been found within a ribosomal protein operon on the plastid genome of the chlorophyll c-containing alga Cryptomonas Φ. The gene encodes a protein or 420 amino acids (molecular weight 46.906 daltons) and contains ten potential membrane-spanning domains, as in the E. coli homologue. This report of a secY homologue in a plastid genome provides preliminary evidence that a prokaryotic-like protein export system may be operating in plastids. © 1992.
Douglas, S. E. (1992). A secY homologue is found in the plastid genome of Cryptomonas Φ. FEBS Letters, 298(1), 93–96. https://doi.org/10.1016/0014-5793(92)80029-G