Comparative studies of the quinic acid (qa) cluster in several Neurospora species with special emphasis on the qa-x-qa-2 intergenic region - PubMed (original) (raw)

Comparative Study

. 1991 Dec;230(3):337-44.

doi: 10.1007/BF00280289.

Affiliations

• PMID: 1685010
• DOI: 10.1007/BF00280289

Comparative Study

Comparative studies of the quinic acid (qa) cluster in several Neurospora species with special emphasis on the qa-x-qa-2 intergenic region

D K Asch et al. Mol Gen Genet. 1991 Dec.

Abstract

The organization of the quinic acid (qa) genes in Neurospora crassa has been compared to that in several other Neurospora species. This gene cluster was found to be highly conserved in all species examined. However, there are numberous restriction fragment length polymorphisms that distinguish the heterothallic and homothallic species. Catabolic dehydroquinase assays indicated that qa-2 gene expression in the homothallic species is subject to induction by quinic acid, as is the case in N. crassa. The qa-x-qa-2 intergenic region of the homothallic species N. africana was cloned and sequenced. Conserved qa activator (qa-1F) binding sites have been identified in this region. When the qa-x-qa-2 intergenic region of N. crassa was replaced with its N. africana counterpart, qa-2 gene expression was reduced; however repression by glucose appeared normal. Furthermore, the N. africana start site for qa-2 transcription (which differs from the N. crassa start site) was utilized in the transformant. The overall evidence suggests that a weakening of the -120 activator binding site in the qa-x-qa-2 intergenic region may be responsible for these differences.

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