The structure of the CstF-77 homodimer provides insights into CstF assembly.
The cleavage stimulation factor (CstF) is essential for the first step of poly(A) tail formation at the 3' ends of mRNAs. This heterotrimeric complex is built around the 77-kDa protein bridging both CstF-64 and CstF-50 subunits. We have solved the crystal structure of the 77-kDa protein from Encephalitozoon cuniculi at a resolution of 2 A. The structure folds around 11 Half-a-TPR repeats defining two domains. The crystal structure reveals a tight homodimer exposing phylogenetically conserved areas for interaction with protein partners. Mapping experiments identify the C-terminal region of Rna14p, the yeast counterpart of CstF-77, as the docking domain for Rna15p, the yeast CstF-64 homologue.
Legrand
Pierre
P
Institut Européen de Chimie et Biologie, INSERM U869, 2 rue Robert Escarpit Pessac, F-33607, Université Victor Segalen, Bordeaux 2.
Pinaud
Noël
N
Minvielle-Sébastia
Lionel
L
Fribourg
Sébastien
S
D000595:Amino Acid Sequence; D039241:Cleavage Stimulation Factor / Q000737:chemistry* / Q000378:metabolism; D018360:Crystallography, X-Ray; D019281:Dimerization; D009670:Encephalitozoon cuniculi; D005656:Fungal Proteins / Q000737:chemistry / Q000378:metabolism; D008958:Models, Molecular; D008969:Molecular Sequence Data; D029701:Saccharomyces cerevisiae Proteins / Q000737:chemistry / Q000378:metabolism; D016415:Sequence Alignment; D039221:mRNA Cleavage and Polyadenylation Factors / Q000737:chemistry / Q000378:metabolism
D039241:Cleavage Stimulation Factor; D005656:Fungal Proteins; D029701:Saccharomyces cerevisiae Proteins; D039221:mRNA Cleavage and Polyadenylation Factors; C512638:RNA14 protein, S cerevisiae; C512635:RNA15 protein, S cerevisiae