Crystal structure of murine CstF-77: dimeric association and implications for polyadenylation of mRNA precursors.
Cleavage stimulation factor (CstF) is a heterotrimeric protein complex essential for polyadenylation of mRNA precursors. The 77 kDa subunit, CstF-77, is known to mediate interactions with the other two subunits of CstF as well as with other components of the polyadenylation machinery. We report here the crystal structure of the HAT (half a TPR) domain of murine CstF-77, as well as its C-terminal subdomain. Structural and biochemical studies show that the HAT domain consists of two subdomains, HAT-N and HAT-C domains, with drastically different orientations of their helical motifs. The structures reveal a highly elongated dimer, spanning 165 A, with the dimerization mediated by the HAT-C domain. Light-scattering studies, yeast two-hybrid assays, and analytical ultracentrifugation measurements confirm this self-association. The mode of dimerization and the relative arrangement of the HAT-N and HAT-C domains are unique to CstF-77. Our data support a role for CstF dimerization in pre-mRNA 3' end processing.
Bai
Yun
Y
Department of Biological Sciences, Columbia University, New York, NY 10027, USA.
Auperin
Thierry C
TC
Chou
Chi-Yuan
CY
Chang
Gu-Gang
GG
Manley
James L
JL
Tong
Liang
L
D000595:Amino Acid Sequence; D000818:Animals; D039241:Cleavage Stimulation Factor / Q000737:chemistry*; D018360:Crystallography, X-Ray; D019281:Dimerization; D051379:Mice; D008958:Models, Molecular; D008969:Molecular Sequence Data; D026723:Polyadenylation; D011487:Protein Conformation; D012322:RNA Precursors / Q000378:metabolism; D012333:RNA, Messenger / Q000235:genetics*; D011994:Recombinant Proteins / Q000737:chemistry; D016415:Sequence Alignment; D017386:Sequence Homology, Amino Acid
D039241:Cleavage Stimulation Factor; C519384:CstF-77 protein, mouse; D012322:RNA Precursors; D012333:RNA, Messenger; D011994:Recombinant Proteins