Like all organisms fungi needs nitrogen for building proteins and nucleic acids. Fungi also need nitrogen for the amino sugars they use to build the chitin in their cell walls. Polymeric nitrogen sources are broken down by extracellular proteases and nucleases. The resulting peptides, purines, pyrimidines and amino acids are then pumped into the cytoplasm by special transporters in the plasma membrane. From these monomers the fungi can build polymers (Fig 12).

Fungal Nutrition Nitrogen

Fig 12. Nitrogen metabolism in fungi

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