3BAP

Crystal Structure of the 25 kDa Subunit of Human Cleavage Factor Im

3BAP の概要

• エントリーDOI: 10.2210/pdb3bap/pdb
• 関連するPDBエントリー: 2Cl3 2j8q
• 分子名称: Cleavage and polyadenylation specificity factor subunit 5, GLYCEROL (3 entities in total)
• 機能のキーワード: cpsf5, rna processing, cleavage factor, mrna processing, nucleus, phosphoprotein, rna-binding, rna binding protein
• 由来する生物種: Homo sapiens (human)
• 細胞内の位置: Nucleus : O43809
• タンパク質・核酸の鎖数: 1
• 化学式量合計: 26538.92

構造登録者

Coseno, M.,Doublie, S. (登録日: 2007-11-08, 公開日: 2008-02-19, 最終更新日: 2024-10-30)

主引用文献

Coseno, M.,Martin, G.,Berger, C.,Gilmartin, G.,Keller, W.,Doublie, S.
Crystal structure of the 25 kDa subunit of human cleavage factor Im.
Nucleic Acids Res., 36:3474-3483, 2008

PubMed Abstract: Cleavage factor I(m) is an essential component of the pre-messenger RNA 3'-end processing machinery in higher eukaryotes, participating in both the polyadenylation and cleavage steps. Cleavage factor I(m) is an oligomer composed of a small 25 kDa subunit (CF I(m)25) and a variable larger subunit of either 59, 68 or 72 kDa. The small subunit also interacts with RNA, poly(A) polymerase, and the nuclear poly(A)-binding protein. These protein-protein interactions are thought to be facilitated by the Nudix domain of CF I(m)25, a hydrolase motif with a characteristic alpha/beta/alpha fold and a conserved catalytic sequence or Nudix box. We present here the crystal structures of human CF I(m)25 in its free and diadenosine tetraphosphate (Ap(4)A) bound forms at 1.85 and 1.80 A, respectively. CF I(m)25 crystallizes as a dimer and presents the classical Nudix fold. Results from crystallographic and biochemical experiments suggest that CF I(m)25 makes use of its Nudix fold to bind but not hydrolyze ATP and Ap(4)A. The complex and apo protein structures provide insight into the active oligomeric state of CF I(m) and suggest a possible role of nucleotide binding in either the polyadenylation and/or cleavage steps of pre-messenger RNA 3'-end processing.

PubMed: 18445629
DOI: 10.1093/nar/gkn079

実験手法

X-RAY DIFFRACTION (1.85 Å)