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Solution structure of the loop deletion mutant of PB1 domain of Cdc24p
Structural highlights
FunctionCDC24_YEAST Promotes the exchange of CDC42-bound GDP by GTP. Controls the polarity of calmodulin, and the calcium regulatory process of bud emergence. CDC24 may be involved in the initial selection and organization of the budding site. Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMedBem1 and Cdc24 of the budding yeast Saccharomyces cerevisiae interact with each other through PB1-PB1 heterodimer formation to regulate the establishment of cell polarity. Here we present the tertiary structure of the heterodimer of Bem1 and Cdc24 PB1 domains determined by NMR spectroscopy. To avoid ambiguity in the NMR spectral analysis, we first prepared a mutant of the Cdc24 PB1 domain that had truncated loops. The mutant provided well dispersed spectra without spectral overlapping, thus allowing unambiguous spectral assignments for structure determination. We confirmed that the loop deletion-mutant was quite similar to the wild-type in both 3D structure and binding affinity. The NMR structure of the heterodimer of the deletion-mutant of Cdc24 PB1 and Bem1 PB1 was determined using a variety of isotope labelled samples including perdeuteration. The interface between the Bem1/Cdc24 PB1 heterodimer was analysed at atomic resolution. Through a comparison with the tertiary structures of other PB1-PB1 heterodimers, we found that conserved electrostatic properties on the molecular surface were commonly used for PB1-PB1 interaction, but hydrophobic interactions were important for cognate interaction in Bem1/Cdc24 PB1 heterodimer formation. NMR structure of the heterodimer of Bem1 and Cdc24 PB1 domains from Saccharomyces cerevisiae.,Ogura K, Tandai T, Yoshinaga S, Kobashigawa Y, Kumeta H, Ito T, Sumimoto H, Inagaki F J Biochem. 2009 Sep;146(3):317-25. Epub 2009 May 18. PMID:19451149[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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