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Nucleic Acids Research, 1982, Vol. 10, No. 16 4985-5002
© 1982

MOLECULAR BIOLOGY

The maize chloroplast genes for the ß and {varepsilon} subunits of the photosynthetic factor CF1 are fused

Enno T. Krebbers, Ignacio M. Larrinua, Lee McIntosh* and Lawrence Bogorad

The Biological Laboratories, Harvard University 16 Divinity Avenue, Cambridge, MA 02138, USA

Received April 27, 1982. Revised June 29, 1982. Accepted June 29, 1982.

We have cloned and sequenced the maize chloroplast genome fragment Eco RI e which contains the 2.2 kb transcript previously reported (Link, G. and Bogorad, L. (1980) Proc. Nat. Acad. Sci. 77 6821–6825) to lie next to the maize gene for the large subunit of ribulose bisphosphate carboxylase (LS) and to he transcribed divergently. Immunochemical and sequencing data show that the gene codes for the ß subunit of the maize chloroplast coupling factor complex (CF1) The derived amino acid sequence is highly homologous to that of the corresponding E. coli protein (Saraste derline<et al. (1981) Nucleic Acids Res. 9 5287–5296). The last base of the codon for the terminal lysine residue of the ß subunit of CF1 is the first base of the codon for the initiating mathionine of an open reading frame whose derived amino acid composition and size closely match that reported for the {varepsilon} subunit (Binder et al. (1978) J. Biol. Chem. 253 3094–3100). The close coupling of the two genes may serve to insure their stoichiometric production.

*L. McIntosh's present address is: MST-DOE Plant Research Laboratory, Michigan State University, East Lansing, Michigan 48824.


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