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. 1992 Mar;11(3):1177–1185. doi: 10.1002/j.1460-2075.1992.tb05158.x

Species specific protein--DNA interactions may determine the chromatin units of genes in S.cerevisiae and in S.pombe.

F Bernardi 1, M Zatchej 1, F Thoma 1
PMCID: PMC556560  PMID: 1547778

Abstract

Yeast genes, such as URA3, are chromatin units characterized by positioned nucleosomes and flanking nuclease sensitive regions (NSRs). To investigate the structural determinants at the chromatin level in vivo, the URA3 gene was dissected into three parts (U5', Umid and U3'), and the chromatin structures of the individual parts were analysed after insertion into minichromosomes and after chromatin assembly in vivo in Saccharomyces cerevisiae. While nucleosome positions were altered on Umid, the 5'-end and the 3'-end of URA3 maintained their native structures (a positioned nucleosome and a NSR each) independent of the site or orientation of insertion. This suggests that the chromatin unit of the native URA3 gene is dominated by strong protein boundaries at the 5'- and 3'-ends. In an alternative approach, we investigated whether nucleosome positions or NSRs were maintained when the whole URA3 gene was placed on a shuttle vector and assembled into chromatin by Schizosaccharomyces pombe providing different proteins, but the same nucleosomal spacing. In a complementary exchange experiment, the ade6 gene of S.pombe was shuttled to S.cerevisiae. In spite of a general conservation of histone proteins and nucleosome core structures, neither nucleosome positions nor NSRs were maintained in the heterologous background. The results demonstrate that chromatin structures are species specific and that the structural boundaries of yeast genes may be dominated by strong species specific protein-DNA interactions.

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