UV-induced crosslinking of DNA-binding proteins to DNA in intact nuclei of Saccharomyces cerevisiae and subsequent protein image hybridization were applied to map non-histone proteins along single-copy genes of yeast. We detected two polypeptides that most probably correspond to core subunits of yeast RNA-polymerase II in the coding region of transketolase gene (TKL2). Several non-histone proteins were also detected which bind to the upstream region of TKL2 gene, and to the intergenic spacer between calmodulin (CMD1) and β-mannosyl transferase (ALG1) genes.