Fig. 5.

The barley Xantha-l gene encoding a membrane-bound component of the aerobic cyclase (GenBank accession no. AY887063). Below the exon DNA (underlined) is the derived amino acid sequence of the polypeptide. The nucleotides affected by the xantha-l³⁵, xantha-l⁸¹, and xantha-l⁸² mutations and the corresponding amino acid residue are shown in bold type. In mutant xantha-l³⁵, a TCC codon has been changed to TTC (Ser-181 to Phe). In mutant xantha-l⁸¹, a GGG codon has been changed to GAG (Gly-155 to Glu). In mutant xantha-l⁸², a TGG codon encoding Trp-291 has been changed to a TGA stop codon.