caa a22 4500 397574282 CHVBK 20180308164850.0 cr unu---uuuuu 161202e199612 xx s 000 0 eng 10.1093/hmg/5.12.1915 doi (NATIONALLICENCE)oxford-10.1093/hmg/5.12.1915 The Molecular Basis of Boston-Type Craniosynostosis: The Pro148→His Mutation in the N-Terminal Arm of the MSX2 Homeodomain Stabilizes DNA Binding without Altering Nucleotide Sequence Preferences [Elektronische Daten] [Liang Ma, Serge Golden, Linda Wu, Rob Maxson] Craniosynostosis, Boston type is an autosomal dominant disorder that results in the premature fusion of cal-varial bones and ensuing abnormalities in skull shape. We showed previously that this disorder is tightly linked to the Msx2 homeobox gene on the long arm of chromosome 5, and that affected individuals bear a mutated copy of Msx2. In addition, transgenic mice in which either mutant or wild-type mouse Msx2 is overexpressed in the developing skull also exhibit craniosynostosis. That both mutant and wild-type Msx2 elicit craniosynos-tosis in transgenic mice and that the Boston type mutation is dominant led us to hypothesize that the mutation might enhance the normal function of Msx2. The mutation is located in position 7 of the N-terminal arm of the homeodomain, a region implicated in both target sequence recognition and protein-protein interactions. Here we test the hypothesis that the Pro148→ His mutation alters the DNA binding properties of Msx2. Using gel shift and binding site selection analyses, we show that the mutation enhances the affinity of Msx2 for a set of known Msx2 target sequences but has little or no effect on the site specificity ofMsx2 binding. The enhancement of Msx2 binding is due largely if not entirely to an increased stability of the mutant Msx2-DNA complex. These data provide a molecular-level explanation of how the Pro148→His mutation enhances Msx2 function and thus leads to the dominant craniosynostosis phenotype. © 1993 Oxford University Press Ma Liang Department of Biochemistry and Molecular Biology, Kenneth R. Norris Cancer Hospital and Institute, University of Southern California School of Medicine, 1441 Eastlake Avenue, Los Angeles, CA 90033, USA aut Golden Serge Department of Biochemistry and Molecular Biology, Kenneth R. Norris Cancer Hospital and Institute, University of Southern California School of Medicine, 1441 Eastlake Avenue, Los Angeles, CA 90033, USA aut Wu Linda Department of Biochemistry and Molecular Biology, Kenneth R. Norris Cancer Hospital and Institute, University of Southern California School of Medicine, 1441 Eastlake Avenue, Los Angeles, CA 90033, USA aut Maxson Rob Department of Biochemistry and Molecular Biology, Kenneth R. Norris Cancer Hospital and Institute, University of Southern California School of Medicine, 1441 Eastlake Avenue, Los Angeles, CA 90033, USA aut Human Molecular Genetics Oxford University Press 5/12(1996-12), 1915-1920 0964-6906 5:12<1915 1996 5 hmg https://doi.org/10.1093/hmg/5.12.1915 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1093/hmg/5.12.1915 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Ma Liang Department of Biochemistry and Molecular Biology, Kenneth R. Norris Cancer Hospital and Institute, University of Southern California School of Medicine, 1441 Eastlake Avenue, Los Angeles, CA 90033, USA aut NATIONALLICENCE 700 1- Golden Serge Department of Biochemistry and Molecular Biology, Kenneth R. Norris Cancer Hospital and Institute, University of Southern California School of Medicine, 1441 Eastlake Avenue, Los Angeles, CA 90033, USA aut NATIONALLICENCE 700 1- Wu Linda Department of Biochemistry and Molecular Biology, Kenneth R. Norris Cancer Hospital and Institute, University of Southern California School of Medicine, 1441 Eastlake Avenue, Los Angeles, CA 90033, USA aut NATIONALLICENCE 700 1- Maxson Rob Department of Biochemistry and Molecular Biology, Kenneth R. Norris Cancer Hospital and Institute, University of Southern California School of Medicine, 1441 Eastlake Avenue, Los Angeles, CA 90033, USA aut NATIONALLICENCE 773 0- Human Molecular Genetics Oxford University Press 5/12(1996-12), 1915-1920 0964-6906 5:12<1915 1996 5 hmg Metadata rights reserved CC BY-NC-4.0 http://creativecommons.org/licenses/by-nc/4.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-oxford