4H1G

Structure of Candida albicans Kar3 motor domain fused to maltose-binding protein

Summary for 4H1G

• Entry DOI: 10.2210/pdb4h1g/pdb
• Related: 3KAR 3T0Q 4GKR
• Related PRD ID: PRD_900010
• Descriptor: Maltose binding protein-CaKar3 motor domain fusion protein, alpha-D-glucopyranose-(1-4)-alpha-D-glucopyranose-(1-4)-alpha-D-glucopyranose-(1-4)-alpha-D-glucopyranose, MAGNESIUM ION, ... (6 entities in total)
• Functional Keywords: kinesin motor domain, motor protein, chimera
• Biological source: Escherichia coli (yeast); More
• Total number of polymer chains: 1
• Total formula weight: 80262.25

Authors

Allingham, J.A.,Duan, D.,Delorme, C.,Joshi, M. (deposition date: 2012-09-10, release date: 2012-10-10, Last modification date: 2023-09-13)

Primary citation

Delorme, C.,Joshi, M.,Allingham, J.S.
Crystal structure of the Candida albicans Kar3 kinesin motor domain fused to maltose-binding protein.
Biochem.Biophys.Res.Commun., 428:427-432, 2012

PubMed Abstract: In the human fungal pathogen Candida albicans, the Kinesin-14 motor protein Kar3 (CaKar3) is critical for normal mitotic division, nuclear fusion during mating, and morphogenic transition from the commensal yeast form to the virulent hyphal form. As a first step towards detailed characterization of this motor of potential medical significance, we have crystallized and determined the X-ray structure of the motor domain of CaKar3 as a maltose-binding protein (MBP) fusion. The structure shows strong conservation of overall motor domain topology to other Kar3 kinesins, but with some prominent differences in one of the motifs that compose the nucleotide-binding pocket and the surface charge distribution. The MBP and Kar3 modules are arranged such that MBP interacts with the Kar3 motor domain core at the same site where the neck linker of conventional kinesins docks during the "ATP state" of the mechanochemical cycle. This site differs from the Kar3 neck-core interface in the recent structure of the ScKar3Vik1 heterodimer. The position of MBP is also completely distinct from the Vik1 subunit in this complex. This may suggest that the site of MBP interaction on the CaKar3 motor domain provides an interface for the neck, or perhaps a partner subunit, at an intermediate state of its motile cycle that has not yet been observed for Kinesin-14 motors.

PubMed: 23137538
DOI: 10.1016/j.bbrc.2012.10.101

Experimental method

X-RAY DIFFRACTION (2.15 Å)