DNA superstructural features and nucleosomal organization of the two centromeres of Kluyveromyces lactis chromosome 1 and Saccharomyces cerevisiae chromosome 6

FEBS Letters

Del Cornò, Manuela³  Savino, Maria⁴  De Santis, Pasquale²  Sampaolese, Beatrice¹ 

[1] Centro di Studio per gli Acidi Nucleici del CNR, Università di Roma ``La Sapienza', Piazzale A. Moro n. 5, 00185, Roma, Italy;Dipartimento di Chimica, Università di Roma ``La Sapienza', Piazzale A. Moro n. 5, 00185, Roma, Italy;Instituto Pasteur-Fondazione Cenci Bolognetti, Università di Roma ``La Sapienza', Piazzale A. Moro n. 5, 00185, Roma, Italy;Dipartimento di Genetica e Biologica Molecolare, Università di Roma ``La Sapienza', Piazzale A. Moro n. 5, 00185, Roma, Italy

关键词: Centromere;    DNA curvature;    Nucleosome assembly;    Yeast;   

DOI  :  10.1016/S0014-5793(98)00702-9

学科分类：生物化学/生物物理

来源: John Wiley & Sons Ltd.

【 摘 要 】

Superstructural features of the Kluyveromyces lactis chromosome 1 (KlCEN1) and of the Saccharomyces cerevisiae chromosome 6 (SCEN6) centromeric DNAs were evaluated using a theoretical method, developed by our group, and experimentally measured by gel electrophoretic retardation. Both methods show that, in spite of the remarkable AT richness of the two centromeric sequences, their curvature is not very high. However the peculiar sequence features of the two centromeres allow to organize highly stable nucleosomes, with a free energy about that of the nucleosome formed on the 5S RNA gene. The good agreement between experimental and theoretical evaluation of nucleosome free energies as well as of their multiple positioning shows that in centromeres both DNA curvature and flexibility are relevant in determining nucleosomal features.

【 授权许可】

Unknown