Structures of the genes for the beta and epsilon subunits of spinach chloroplast ATPase indicate a dicistronic mRNA and an overlapping translation stop/start signal.
A 2,4-kilobase-pair region of spinach chloroplast DNA adjacent to the gene for the large subunit of ribulosebisphosphate carboxylase has been analyzed by RNA hybridization, in vitro transcription/translation, and DNA sequence determination. The analysis indicates that this region carries the genes for the beta and epsilon subunits of chloroplast ATPase and that the two genes are cotranscribed into a dicistronic mRNA with 4-base-pair overlap between the stop codon of the beta-subunit gene and the start codon of the epsilon-subunit gene. The ATPase and carboxylase genes are transcribed divergently with respect to each other. The deduced amino acid sequences of the beta and epsilon subunits from spinach show 67% and 26% homology, respectively, with the published sequences of the beta and epsilon subunits of Escherichia coli ATPase.
Zurawski
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Division of Plant Industry, Commonwealth Scientific and Industrial Research Organisation, Post Office Box 1600, Canberra City, A.C.T. 2601, Australia.
Bottomley
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Whitfeld
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