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Nucleic Acids Research, 2000, Vol. 28, No. 7 1594-1603
© 2000 Oxford University Press

Positive and negative mutant selection in the human histone hairpin-binding protein using the yeast three-hybrid system

Franck Martin1,2, Fabrice Michel1, Daniel Zenklusen1, Berndt Müller1 and Daniel Schümperli1,*

1Abteilung für Entwicklungsbiologie, Zoologisches Institut der Universität Bern, Baltzerstrasse 4, 3012 Bern, Switzerland and 2Institut de Biologie Moléculaire et Cellulaire du CNRS, UPR 9002, 15 rue René Descartes, F-67084 Strasbourg Cedex, France

We have used the yeast three-hybrid system in a positive selection for mutants of the human histone hairpin-binding protein (HBP) capable of interacting with non-canonical hairpins and in a negative selection for loss-of-binding mutants. Interestingly, all mutations from the positive selection are located in the N- and C-terminal regions flanking a minimal RNA-binding domain (RBD) previously defined between amino acids 126 and 198. Further, in vitro binding studies demonstrate that the RBD, which shows no obvious similarity to other RNA-binding motifs, has a relaxed sequence specificity compared to full-length HBP, allowing it to bind to mutant hairpin RNAs not normally found in histone genes. These findings indicate that the sequences flanking the RBD are important for restricting binding to the highly conserved histone hairpin structure. Among the loss-of-binding mutations, about half are nonsense mutations distributed throughout the N-terminal part and the RBD whereas the other half are missense mutations restricted to the RBD. Whereas the nonsense mutations permit a more precise definition of the C-terminal border of the RBD, the missense mutations identify critical residues for RNA binding within the RBD.

* To whom correspondence should be addressed. Tel: +41 31 631 4675; Fax: +41 31 631 4616; Email: daniel.schuemperli@zoi.unibe.ch Present addresses: Daniel Zenklusen, Institut de Microbiologie, Université de Lausanne, Rue du Bugnon 44, 1011 Lausanne, Switzerland Berndt Müller, Department of Molecular and Cell Biology, Institute of Medical Sciences, University of Aberdeen, Aberdeen AB25 2ZD, UK


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