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  Section: Plant Nutrition » Micronutrients » Zinc
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Role of Zinc in DNA and RNA Metabolism and Protein Synthesis

Early Research on Zinc Nutrition of Crops
Absorption and Function of Zinc in Plants
Zinc Deficiency
Zinc Tolerance
Trunk Injection
Zinc in Soils
Phosphorus–Zinc Interactions
Tryptophan and Indole Acetic and Synthesis
Root Uptake
Foliar Absorption
  Influence of Humidity on Foliar Absorption
Role of Zinc in DNA and RNA Metabolism and Protein Synthesis
Zinc Transporters and Zinc Efficiency

The role of zinc in cell division and protein synthesis has been known for a long time, but recently a new class of zinc-dependent protein molecules (zinc metalloproteins) has been identified in DNA replication and transcription, thus regulating gene expression (10,11). Zinc is required for binding of specific genes with tetrahedral bonds that result in transcription. By this means the polypeptide chain forms a loop of usually 11 to 13 amino acid residues, which bind the specific DNA sequences. Zinc is therefore directly involved in the translation step of gene expression of DNA elements in these DNA-binding metalloproteins.

Amino acids accumulate in zinc-deficient plants as protein content decreases (54). Protein synthesis resumes when zinc is resupplied because zinc is a structural component of the ribosomes and responsible for their structural integrity. Ribosomes disintegrate in the absence of zinc, but reconstitution reoccurs with the resupply of zinc.


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