Characterization of an opsin gene from the ascomycete Leptosphaeria maculans

Genome Génome / Conseil National De Recherches Canada
A Idnurm, B J Howlett

Abstract

An opsin gene (ops) has been characterized from Leptosphaeria maculans, the ascomycete that causes black-leg disease of Brassica species. This is the second opsin identified outside the archaeal and animal kingdoms. The gene encodes a predicted protein with high similarity (70.3%) and identity (53.3%) to the nop-1 opsin of another ascomycete Neurospora crassa. The L. maculans opsin also has identical amino acid residues in 20 of the 22 residues in the retinal-binding pocket of archaeal opsins. Opsin, on the fourth largest chromosome of L. maculans and 22 cM from the mating type locus, is the first cloned gene to be mapped in L. maculans. Opsin is transcribed at high levels in mycelia grown in the presence and absence of light; this pattern is in contrast with that of the N. crassa opsin, which is transcribed only in the light.

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