nit-2, the major positive-acting nitrogen regulatory gene of Neurospora crassa, encodes a sequence-specific DNA-binding protein.
basic_science · Level V
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- Record sourced from PubMed, PMID 2142530.
- Also identified by PMC identifier 54317.
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Abstract
The nit-2 major nitrogen regulatory gene of Neurospora crassa turns on the expression of various unlinked structural genes that specify nitrogen-catabolic enzymes under nitrogen-limitation conditions. The nit-2 gene encodes a protein of 1036 amino acid residues with a single zinc finger and a downstream basic region that may make up a DNA-binding domain. The zinc-finger domain of the NIT2 protein was synthesized in two ways to examine its DNA-binding activity with gel-band-mobility shift and DNA-footprint experiments. The NIT2 protein binds to specific DNA recognition elements that are located upstream of nitrogen-regulated structural genes. Each recognition element contains at least two copies of a core sequence whose consensus is TATCTA.
Medical subject headings
- DNA-Binding Proteins
- Genes, Bacterial
- Genes, Fungal
- Metalloproteins
- Neurospora
- Neurospora crassa
- Nitrogen Fixation