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Nucleic Acids Research, 1994, Vol. 22, No. 1 32-40
© 1994

MOLECULAR BIOLOGY

The yeast protein encoded by PUB1 binds T-rich single stranded DNA

Moira Cockell, Severine Frutiger1, Graham J. Hughes1 and Susan M. Gasser*

Swiss Institute for Experimental Cancer Research (ISREC) Chemin des Boveresses 155, CH-1066 Epalinges/Lausanne 1Centre Medical Universitaire, Université de Genéve, Département de Biochimie Médicale 1 rue Servet, CH-1211 Geneva 4, Switzerland

*To whom correspondence should be addressed

Received October 18, 1993. Accepted December 6, 1993.

We have characterized binding activities in yeast which recognise the T-rich strand of the yeast ARS consensus element and have purified two of these to homogeneity. One (ACBP-60) is detectable in both nuclear and whole cell extracts, while the other (ACBP-67) Is apparent only after fractionatlon of extracts by heparin-sepharose chromatography. The major binding activity detected In nuclear extracts was purified on a sequence-specific DNA affinity column as a single polypeptlde with apparent mobility of 60kDa (ACBP-60). This protein co-fractlonates with nuclei, Is present at several thousand copies per cell and has a Kd, for the T-rich single strand of the ARS consensus between 10–9 and 10–10 M. Competition studies with simple nucleic acid polymers show that ACBP-60 has marginally higher affinity for poly dT30 than for a 30 nt oligomer containing the T-rich strand of ARS 307, and approximately 10 fold higher affinity for poly rU. Internal sequence information of purified p60 reveals Identity with the open reading frames of genes PUB1 and RNP1 which encode polyurldylate binding protein(s). The second binding activity, ACBP-67, also binds specifically to the T-rich single strand of the ARS consensus, but with considerably lower affinity than ACBP-60. Peptlde sequence reveals that the 67kDa protein is Identical to the major polyA binding protein in yeast, PAB1.


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