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A cloned restriction fragment of maize chloroplast DNA (Bam H1 fragment 5) is shown to contain an open reading frame which encodes a basic protein of 201 amino acid residues with 40-50% sequence homology to E. coli ribosomal protein S4. Based on the experimentally determined sequence homology between the highly conserved bacterial ribosomal protein L12 and its chloroplast homologue (Bartsch M., Kimura, M. and Subramanian, A.R. (1982) Proc. Natl. Acad. Sci. USA 79, 6871), we conclude that this reading frame represents the maize chloroplast S4 gene. The nucleotide sequence of a 1100 base pair DNA segment containing the putative gene is presented.

Maize chloroplast DNA encodes a protein sequence homologous to the bacterial ribosome assembly protein S4