ジャーナル: Mol Cell / 年: 2014 タイトル: Modular assembly of RWD domains on the Mis12 complex underlies outer kinetochore organization. 著者: Arsen Petrovic / Shyamal Mosalaganti / Jenny Keller / Marta Mattiuzzo / Katharina Overlack / Veronica Krenn / Anna De Antoni / Sabine Wohlgemuth / Valentina Cecatiello / Sebastiano Pasqualato ...著者: Arsen Petrovic / Shyamal Mosalaganti / Jenny Keller / Marta Mattiuzzo / Katharina Overlack / Veronica Krenn / Anna De Antoni / Sabine Wohlgemuth / Valentina Cecatiello / Sebastiano Pasqualato / Stefan Raunser / Andrea Musacchio / 要旨: Faithful chromosome segregation is mandatory for cell and organismal viability. Kinetochores, large protein assemblies embedded in centromeric chromatin, establish a mechanical link between ...Faithful chromosome segregation is mandatory for cell and organismal viability. Kinetochores, large protein assemblies embedded in centromeric chromatin, establish a mechanical link between chromosomes and spindle microtubules. The KMN network, a conserved 10-subunit kinetochore complex, harbors the microtubule-binding interface. RWD domains in the KMN subunits Spc24 and Spc25 mediate kinetochore targeting of the microtubule-binding subunits by interacting with the Mis12 complex, a KMN subcomplex that tethers directly onto the underlying chromatin layer. Here, we show that Knl1, a KMN subunit involved in mitotic checkpoint signaling, also contains RWD domains that bind the Mis12 complex and that mediate kinetochore targeting of Knl1. By reporting the first 3D electron microscopy structure of the KMN network, we provide a comprehensive framework to interpret how interactions of RWD-containing proteins with the Mis12 complex shape KMN network topology. Our observations unveil a regular pattern in the construction of the outer kinetochore.
超分子 #1000: KMN network reconstituted as follows: human Mis12complex bound to...
超分子
名称: KMN network reconstituted as follows: human Mis12complex bound to Ndc80complex (bonsai) and Knl1( from amino acids, 2106-2316) タイプ: sample / ID: 1000 / 詳細: The sample was monodisperse 集合状態: One heterotetramer of Mis12C binds heterotetramer of Ndc80C and Knl1(2106-2316) Number unique components: 9
UniProtKB: Protein MIS12 homolog / GO: MIS12/MIND type complex / InterPro: Centromere protein Mis12
+
分子 #2: Polyamine-modulated factor 1
分子
名称: Polyamine-modulated factor 1 / タイプ: protein_or_peptide / ID: 2 / Name.synonym: PMF1 or NNF1 詳細: truncated protein from amino acids (31-205) was generated and used for the complex formation コピー数: 1 / 集合状態: Monomer / 組換発現: Yes
由来(天然)
生物種: Homo sapiens (ヒト) / 別称: Human / Organelle: nucleus, centeromere / 細胞中の位置: Kinetochore
UniProtKB: Polyamine-modulated factor 1 / GO: MIS12/MIND type complex / InterPro: Kinetochore-associated protein Nnf1
+
分子 #3: Dsn1
分子
名称: Dsn1 / タイプ: protein_or_peptide / ID: 3 詳細: truncated protein from amino acids (68-356) was generated and used for the complex formation コピー数: 1 / 集合状態: Monomer / 組換発現: Yes
由来(天然)
生物種: Homo sapiens (ヒト) / 別称: Human / Organelle: nucleus, centeromere / 細胞中の位置: Kinetochore
UniProtKB: Kinetochore-associated protein NSL1 homolog / GO: MIS12/MIND type complex / InterPro: Kinetochore Mis14/Nsl1
+
分子 #5: Bub-linking kinetochore protein
分子
名称: Bub-linking kinetochore protein / タイプ: protein_or_peptide / ID: 5 / Name.synonym: Blinkin, Casc5, Knl1 詳細: truncated protein from amino acids (2106-2311) was generated and used for the complex formation コピー数: 1 / 集合状態: Monomer / 組換発現: Yes
由来(天然)
生物種: Homo sapiens (ヒト) / 別称: Human / Organelle: nucleus, centeromere / 細胞中の位置: Kinetochore
名称: Highly expressed in cancer-1 / タイプ: protein_or_peptide / ID: 6 / Name.synonym: Hec1, Ndc80 詳細: truncated protein from amino acids (1-286) was generated and used for the complex formation コピー数: 1 / 集合状態: Monomer / 組換発現: Yes
由来(天然)
生物種: Homo sapiens (ヒト) / 別称: Human / Organelle: nucleus, centeromere / 細胞中の位置: Kinetochore
UniProtKB: Kinetochore protein NDC80 homolog / GO: Ndc80 complex / InterPro: Kinetochore protein Ndc80
+
分子 #7: Spc25
分子
名称: Spc25 / タイプ: protein_or_peptide / ID: 7 / Name.synonym: spc25 詳細: truncated protein from amino acids (118-224) was generated and used for the complex formation コピー数: 1 / 集合状態: Monomer / 組換発現: Yes
由来(天然)
生物種: Homo sapiens (ヒト) / 別称: Human / Organelle: nucleus, centeromere / 細胞中の位置: Kinetochore
UniProtKB: Kinetochore protein Spc25 / GO: Ndc80 complex / InterPro: Chromosome segregation protein Spc25, C-terminal
+
分子 #8: Spc24
分子
名称: Spc24 / タイプ: protein_or_peptide / ID: 8 詳細: truncated protein from amino acids (122-197) was generated and used for the complex formation コピー数: 1 / 集合状態: Monomer / 組換発現: Yes
由来(天然)
生物種: Homo sapiens (ヒト) / 別称: Human / Organelle: nucleus, centeromere / 細胞中の位置: Kinetochore
Tilt pairs were collected at 50 and 0 degrees. Particle pairs were manually selected using e2RCTboxer program. RCT reconstruction of tilted particles was calculated from best class average by back projection and was followed by back projection refinement.
最終 再構成
想定した対称性 - 点群: C1 (非対称) / アルゴリズム: OTHER / 解像度のタイプ: BY AUTHOR / 解像度: 26.7 Å / 解像度の算出法: OTHER / ソフトウェア - 名称: EMAN2/sparx / 使用した粒子像数: 3764