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The gene for spiralin, the major membrane protein of the helical mollicute Spiroplasma citri, was cloned in Escherichia coli as a 5-kilobase-pair (kbp) DNA fragment. The complete nucleotide sequence of the 5.0-kbp spiroplasmal DNA fragment was determined (GenBank accession no. M31161). The spiralin gene was identified by the size and amino acid composition of its translational product. Besides the spiralin gene, the spiroplasmal DNA fragment was found to contain five additional open reading frames (ORFs). The translational products of four of these ORFs were identified by their amino acid sequence homologies with known proteins: ribosomal protein S2, elongation factor Ts, phosphofructokinase, and pyruvate kinase, respectively encoded by the genes rpsB, tsf, pfk, and pyk. The product of the fifth ORF remains to be identified and was named protein X (X gene). The order of the above genes was tsf--X--spiralin gene--pfk--pyk. These genes were transcribed in one direction, while the gene for ribosomal protein S2 (rpsB) was transcribed in the opposite direction.

journal of bacteriology

Organization and nucleotide sequences of the Spiroplasma citri genes for ribosomal protein S2, elongation factor Ts, spiralin, phosphofructokinase, pyruvate kinase, and an unidentified protein