Zein level in maize endosperm depends on a protein under control of the opaque-2 and opaque-6 loci.
Zeins, the major endosperm proteins of maize, represent about 50% of total seed proteins and consist of several alcohol-soluble polypeptides encoded by at least four families of genes. The accumulation of zeins is under the control of several broadly defined regulatory genes. One of these, the opaque-2 mutant, lowers the level of zeins, thus improving the nutritional quality of maize meals. We demonstrate here that a salt-soluble protein of molecular weight 32,000 (b-32) is under control of O2. Seven o2 recessive alleles are CRM- when assayed with b-32 antibody. The O2 gene does not encode protein b-32, which apparently is the gene product of the O6 locus. 06 endosperms are CRM- for b-32 protein and are almost devoid of zeins. This indicates that b-32 plays an important role in accumulation of zeins.
D004591:Electrophoresis, Polyacrylamide Gel; D005786:Gene Expression Regulation; D005796:Genes; D005809:Genes, Regulator; D007122:Immunoelectrophoresis; D007525:Isoelectric Focusing; D010940:Plant Proteins / Q000096:biosynthesis; D012639:Seeds / Q000032:analysis; D003313:Zea mays / Q000235:genetics*; D015028:Zein / Q000032:analysis / Q000235:genetics*
D010940:Plant Proteins; D015028:Zein