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  • 1975-1979  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Linkage relationships between regulatory and structural gene loci involved in zein synthesis in maize (1978)
    Springer
    Theoretical and applied genetics 52 (1978), S. 263-267 
    Details
    ISSN: 1432-2242
    Keywords: Zein synthesis ; Gene regulation ; Opaque-2 ; linkage relationships
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The synthesis of at least 15 zein polypeptides is under the control of regulatory gene loci. One of these, Opaque-2 (chromosome 7, position 16) strongly reduces the zein accumulation without modifying the zein molecular components. The linkage relationship between the regulatory gene 02 and the 5 structural loci (Zp1, Zp2, Zp3, Zp6, Zp12) segregating with sample Mendelian ratios have been studied. Zp1, Zp2, Zp3 are closely linked to each other; moreover this gene cluster is located on chromosome 7 at 5.5 cM from the Opaque-2 locus. The structural loci Zp6 and Zp12 are not linked with each other, with the 02 locus or with Zp1, Zp2, Zp3. From our data it follows that the zein structural genes are located in at least three positions on the maize genome. The scattering in the genome of the genes controlled by the Opaque-2 locus suggests a transacting role for this regulatory element.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00303503
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Heterogeneity of storage proteins in maize (1977)
    Springer
    Planta 136 (1977), S. 115-123 
    Details
    ISSN: 1432-2048
    Keywords: Protein ; Storage protein ; Zea ; Zein
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The extensive charge heterogeneity of maize (Zea mays L.) zeins observed in isoelectric focusing (IEF) (about 15 bands with pI's in the pH range 6–9) has been found to be independent of extraction procedures or of endosperm development. Zeins do not stain for glycoproteins and exhibit only one lipoprotein component, with pI 3, representing 3–5% of the total protein. Zeins are very resistant to in vitro deamidation, at both acidic and alkaline pH, at high temperatures, and for rather prolonged times. On the basis of the zein content in acidic and basic amino acids, and of the respective pI's exhibited in IEF (mostly in the pH range 7–8) it has been calculated that at least 90% of the glutamic and aspartic acids (≈52 residues out of a total of ≈ 190) are present as asparagine and glutamine. Amino acid analysis of zein fractions isolated by preparative IEF has demonstrated changes in the composition of 18 amino acid residues. However, since these changes affect only neutral and hydrophobic residues, it is concluded that the observed zein heterogeneity is partly based on in vivo deamidation of glutamine and asparagine and partly to spot mutations in some of the genes responsible for zein synthesis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00396186
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    Paper (German National Licenses)
    Fulltext
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