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p13suc1 binds to p34cdc2 kinase and is essential for cell cycle progression in eukaryotic cells. The crystal structure of S.pombe p13suc1 has been solved to 2.7 A resolution using data collected at the ESRF source, Grenoble, from both native crystals and crystals of a seleno-methionine derivative. The starting point for structure solution was the determination of the six selenium sites by direct methods. The structure is dominated by a four-stranded beta-sheet, with four further alpha-helical regions. p13suc1 crystallizes as a dimer in the asymmetric unit stabilized by the binding of two zinc ions. A third zinc site stabilizes the higher-order crystal packing. The sites are consistent with a requirement for zinc during crystal growth. A likely site for p13suc1-protein interaction is immediately evident on one face of the p13suc1 surface. This region comprises a group of conserved, exposed aromatic and hydrophobic residues below a flexible negatively charged loop. A conserved positively charged area would also present a notable surface feature in the monomer, but is buried at the dimer interface. p13suc1 is larger than its recently solved human homologue p9CKS2, with the extra polypeptide forming a helical N-terminal extension and a surface loop between alpha-helices 3 and 4. Notably, p13suc1 does not show the unusual beta-strand exchange that creates an intimate p9CKS2 dimer. p13suc1 cannot oligomerize to form a stable hexamer as has been proposed for p9CKS2.

Type

Journal article

Journal

EMBO J

Publication Date

01/03/1995

Volume

14

Pages

1004 - 1014

Keywords

Amino Acid Sequence, CDC2 Protein Kinase, CDC2-CDC28 Kinases, Carrier Proteins, Cell Cycle, Cell Cycle Proteins, Conserved Sequence, Crystallization, Crystallography, X-Ray, Fungal Proteins, Humans, Models, Molecular, Molecular Sequence Data, Protein Conformation, Protein Kinases, Schizosaccharomyces, Schizosaccharomyces pombe Proteins, Zinc