Turnover of Genetically Defined Catalase Isozymes in Maize | Zendy

Peter H. Quail | Zendy; John G. Scandalios | Zendy

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Turnover of Genetically Defined Catalase Isozymes in Maize

Author(s) -

Peter H. Quail,

John G. Scandalios

Publication year - 1971

Publication title -

proceedings of the national academy of sciences

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 5.011

H-Index - 771

eISSN - 1091-6490

pISSN - 0027-8424

DOI - 10.1073/pnas.68.7.1402

Subject(s) - isozyme , catalase , biology , starch , germination , biochemistry , gene , enzyme , chemistry , genetics , botany

The turnover of two homotetramers of catalase, V(4) and Z(4), specified by genes at two separate loci, has been studied during germination of maize seed by the techniques of density labeling and starch-gel electrophoresis. Both isozymes were shown to be turning over during this time. However, Z(4) accumulates because the rate of synthesis exceeds the rate of degradation, whereas V(4) slowly disappears because the rate of degradation exceeds the rate of synthesis. Evidence is also presented that the rate of synthesis of Z(4) exceeds that of V(4), which suggests that this may be a major factor in the differential expression of the two catalase genes.

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