6OD2

Yeast Spc42 C-terminal Antiparallel Coiled-Coil

Summary for 6OD2

• Entry DOI: 10.2210/pdb6od2/pdb
• Descriptor: Spindle pole body component SPC42 (2 entities in total)
• Functional Keywords: coiled-coil, spindle pole body, structural protein
• Biological source: Saccharomyces cerevisiae (strain FostersB) (Baker's yeast)
• Total number of polymer chains: 1
• Total formula weight: 6575.93

Authors

Drennan, A.C.,Krishna, S.,Seeger, M.A.,Andreas, M.P.,Gardner, J.M.,Sether, E.K.R.,Jaspersen, S.L.,Rayment, I. (deposition date: 2019-03-25, release date: 2019-04-24, Last modification date: 2024-10-23)

Primary citation

Drennan, A.C.,Krishna, S.,Seeger, M.A.,Andreas, M.P.,Gardner, J.M.,Sether, E.K.R.,Jaspersen, S.L.,Rayment, I.
Structure and function of Spc42 coiled-coils in yeast centrosome assembly and duplication.
Mol.Biol.Cell, 30:1505-1522, 2019

PubMed Abstract: Centrosomes and spindle pole bodies (SPBs) are membraneless organelles whose duplication and assembly is necessary for bipolar mitotic spindle formation. The structural organization and functional roles of major proteins in these organelles can provide critical insights into cell division control. Spc42, a phosphoregulated protein with an N-terminal dimeric coiled-coil (DCC), assembles into a hexameric array at the budding yeast SPB core, where it functions as a scaffold for SPB assembly. Here, we present in vitro and in vivo data to elucidate the structural arrangement and biological roles of Spc42 elements. Crystal structures reveal details of two additional coiled-coils in Spc42: a central trimeric coiled-coil and a C-terminal antiparallel DCC. Contributions of the three Spc42 coiled-coils and adjacent undetermined regions to the formation of an ∼145 Å hexameric lattice in an in vitro lipid monolayer assay and to SPB duplication and assembly in vivo reveal structural and functional redundancy in Spc42 assembly. We propose an updated model that incorporates the inherent symmetry of these Spc42 elements into a lattice, and thereby establishes the observed sixfold symmetry. The implications of this model for the organization of the central SPB core layer are discussed.

PubMed: 30969903
DOI: 10.1091/mbc.E19-03-0167

Experimental method

X-RAY DIFFRACTION (2.435 Å)