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. 1993 Jun;175(12):3703–3709. doi: 10.1128/jb.175.12.3703-3709.1993

Developmental regulation of the gene for formate dehydrogenase in Neurospora crassa.

C M Chow 1, U L RajBhandary 1
PMCID: PMC204785  PMID: 8509325

Abstract

We have isolated and characterized a gene, fdh, from Neurospora crassa which is developmentally regulated and which produces formate dehydrogenase activity when expressed in Escherichia coli. The gene is closely linked (less than 0.6 kb apart) to the leu-5 gene encoding mitochondrial leucyl-tRNA synthetase; the two genes are transcribed convergently from opposite strands. The expression patterns of these genes differ: fdh mRNA is found only during conidiation and early germination and is not detectable during mycelial growth, while leu-5 mRNA appears during germination and mycelial growth. The structure of the fdh gene was determined from the sequence of cDNA and genomic DNA clones and from mRNA mapping studies. The gene encodes a 375-amino-acid-long protein with sequence similarity to NAD-dependent dehydrogenases of the E. coli 3-phosphoglycerate dehydrogenase (serA gene product) subfamily. In particular, there is striking sequence similarity (52% identity) to formate dehydrogenase from Pseudomonas sp. strain 101. All of the residues thought to interact with NAD in the crystal structure of the Pseudomonas enzyme are conserved in the N. crassa enzyme. We have further shown that expression of the N. crassa gene in E. coli leads to the production of formate dehydrogenase activity, indicating that the N. crassa gene specifies a functional polypeptide.

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Selected References

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