A protein with similarity to the human retinoblastoma binding protein 2 acts 
specifically as a repressor for genes regulated by the b mating type locus in 
Ustilago maydis

Quadbeck-Seeger, C; Wanner, G; Huber, S; Kahmann, R; Kamper, J

doi:10.1046/j.1365-2958.2000.02128.x

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A protein with similarity to the human retinoblastoma binding protein 2 acts specifically as a repressor for genes regulated by the b mating type locus in Ustilago maydis

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Citation

Quadbeck-Seeger, C., Wanner, G., Huber, S., Kahmann, R., & Kamper, J. (2000). A protein with similarity to the human retinoblastoma binding protein 2 acts specifically as a repressor for genes regulated by the b mating type locus in Ustilago maydis. MOLECULAR MICROBIOLOGY, 38(1), 154-166. doi:10.1046/j.1365-2958.2000.02128.x.

Cite as: https://hdl.handle.net/21.11116/0000-000D-6CD0-F

Abstract

Pathogenic development in the corn smut fungus Ustilago maydis is controlled by a heterodimer of the two homeodomain proteins bE and bW which are encoded by the b mating type locus. The bE/bW heterodimer is thought to achieve its function as a transcriptional regulator of pathogenicity genes, either directly by binding to cis regulatory sequences or indirectly via a b-dependent regulatory cascade.
In a screen for components of the b-dependent regulatory cascade we have isolated Rum1 (regulator U. maydis 1), a protein with similarities to the human retinoblastoma binding protein 2. Deletion of rum1 results in expression of several b regulated genes independently from their activation via the bE/bW heterodimer, rum1 mutant strains remain pathogenic, proliferate in planta, but fail to produce spores. The defect leads to an arrest in spore development at a defined stage before the spore wall is generated. Deduced from the highly conserved domain structure of Rum1 that includes a DNA-binding motif and a region known to facilitate the interaction with histone deacetylases, we propose that Rum1 functions as a transcriptional repressor through the modulation of chromatin structure.