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J. Biol. Chem., Vol. 261, Issue 14, 6279-6284, 05, 1986

Sequence analysis and characterization of a maize gene encoding a high- sulfur zein protein of Mr 15,000

K Pedersen, P Argos, SV Naravana and BA Larkins

We have isolated a gene coding for a sulfur-rich zein protein from a maize genomic library. The nucleotide sequence of this gene predicts a protein composed of 180 amino acids, including a 20-amino acid signal peptide. As is true of other zeins, there are no intervening sequences in the gene. Comparison of the nucleotide sequence of this gene with that of a homologous cDNA clone revealed only a single difference resulting in a valine/alanine substitution. The Mr 15,000 zein contains no repetitive nucleotide sequences and shows no homology with genes encoding the Mr 22,000 and 19,000 zeins. Circular dichroism analysis of the Mr 15,000 zein protein revealed that it is composed primarily of beta and turn structures. This gene has a short region of nucleotide sequence homology to the cysteine-rich domain of the Mr 27,000 zein, as well as the cysteine-containing barley B-hordein.
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