dolichyl-phosphate-mannose-protein mannosyltransferase Pmt1p-Pmt2p dimer complex / dolichyl-phosphate-mannose-protein mannosyltransferase Pmt5p-Pmt2p dimer complex / dolichyl-phosphate-mannose-protein mannosyltransferase / dolichyl-phosphate-mannose-protein mannosyltransferase activity / regulation of endoplasmic reticulum unfolded protein response / fungal-type cell wall biogenesis / protein O-linked mannosylation / protein exit from endoplasmic reticulum / protein O-linked glycosylation / ERAD pathway ...dolichyl-phosphate-mannose-protein mannosyltransferase Pmt1p-Pmt2p dimer complex / dolichyl-phosphate-mannose-protein mannosyltransferase Pmt5p-Pmt2p dimer complex / dolichyl-phosphate-mannose-protein mannosyltransferase / dolichyl-phosphate-mannose-protein mannosyltransferase activity / regulation of endoplasmic reticulum unfolded protein response / fungal-type cell wall biogenesis / protein O-linked mannosylation / protein exit from endoplasmic reticulum / protein O-linked glycosylation / ERAD pathway / endoplasmic reticulum membrane / endoplasmic reticulum 類似検索 - 分子機能
Glycosyl transferase family 39/83 / Glycosyltransferase 39-like / Protein O-mannosyl-transferase, C-terminal four TM domain / Dolichyl-phosphate-mannose-protein mannosyltransferase / C-terminal four TMM region of protein-O-mannosyltransferase / MIR motif / MIR domain / MIR domain profile. / Domain in ryanodine and inositol trisphosphate receptors and protein O-mannosyltransferases / Mir domain superfamily 類似検索 - ドメイン・相同性
National Institutes of Health/National Cancer Institute (NIH/NCI)
R01-CA231466
米国
引用
ジャーナル: Nat Struct Mol Biol / 年: 2019 タイトル: Structure of the eukaryotic protein O-mannosyltransferase Pmt1-Pmt2 complex. 著者: Lin Bai / Amanda Kovach / Qinglong You / Alanna Kenny / Huilin Li / 要旨: In eukaryotes, a nascent peptide entering the endoplasmic reticulum (ER) is scanned by two Sec61 translocon-associated large membrane machines for protein N-glycosylation and protein O-mannosylation, ...In eukaryotes, a nascent peptide entering the endoplasmic reticulum (ER) is scanned by two Sec61 translocon-associated large membrane machines for protein N-glycosylation and protein O-mannosylation, respectively. While the structure of the eight-protein oligosaccharyltransferase complex has been determined recently, the structures of mannosyltransferases of the PMT family, which are an integral part of ER protein homeostasis, are still unknown. Here we report cryo-EM structures of the Saccharomyces cerevisiae Pmt1-Pmt2 complex bound to a donor and an acceptor peptide at 3.2-Å resolution, showing that each subunit contains 11 transmembrane helices and a lumenal β-trefoil fold termed the MIR domain. The structures reveal the substrate recognition model and confirm an inverting mannosyl-transferring reaction mechanism by the enzyme complex. Furthermore, we found that the transmembrane domains of Pmt1 and Pmt2 share a structural fold with the catalytic subunits of oligosaccharyltransferases, confirming a previously proposed evolutionary relationship between protein O-mannosylation and protein N-glycosylation.
解像度: 1.35→37.65 Å / Cor.coef. Fo:Fc: 0.972 / Cor.coef. Fo:Fc free: 0.962 / SU B: 0.924 / SU ML: 0.038 / 交差検証法: THROUGHOUT / ESU R: 0.057 / ESU R Free: 0.06 / 詳細: HYDROGENS HAVE BEEN ADDED IN THE RIDING POSITIONS