dolichyl-phosphate-mannose-protein mannosyltransferase Pmt4p homodimer complex / dolichyl-phosphate-mannose-protein mannosyltransferase / dolichyl-phosphate-mannose-protein mannosyltransferase activity / regulation of endoplasmic reticulum unfolded protein response / structural constituent of cell wall / fungal-type cell wall biogenesis / protein O-linked glycosylation via mannose / fungal-type cell wall organization / cellular bud tip / fungal-type cell wall ...dolichyl-phosphate-mannose-protein mannosyltransferase Pmt4p homodimer complex / dolichyl-phosphate-mannose-protein mannosyltransferase / dolichyl-phosphate-mannose-protein mannosyltransferase activity / regulation of endoplasmic reticulum unfolded protein response / structural constituent of cell wall / fungal-type cell wall biogenesis / protein O-linked glycosylation via mannose / fungal-type cell wall organization / cellular bud tip / fungal-type cell wall / protein O-linked glycosylation / fungal-type vacuole / cell periphery / endoplasmic reticulum membrane / endoplasmic reticulum / extracellular region / identical protein binding / plasma membrane 類似検索 - 分子機能
Yeast PIR protein repeat / : / : / Yeast PIR protein repeat / Cell wall mannoprotein PIR1-like, C-terminal domain / Yeast PIR proteins repeats signature. / Yeast PIR proteins repeats profile. / Glycosyl transferase family 39/83 / Glycosyltransferase 39-like / Protein O-mannosyl-transferase, C-terminal four TM domain ...Yeast PIR protein repeat / : / : / Yeast PIR protein repeat / Cell wall mannoprotein PIR1-like, C-terminal domain / Yeast PIR proteins repeats signature. / Yeast PIR proteins repeats profile. / 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)
CA231466
米国
Department of Energy (DOE, United States)
GM131754
米国
引用
ジャーナル: Nat Commun / 年: 2025 タイトル: Pmt4 recognizes two separate acceptor sites to O-mannosylate in the S/T-rich regions of substrate proteins. 著者: Minge Du / Zuanning Yuan / Amanda Kovach / Meinan Lyu / Huilin Li / 要旨: Protein O-mannosyltransferases (PMTs) add mannose to serine/threonine (S/T)-rich proteins in the endoplasmic reticulum, facilitating proper folding and trafficking through the secretory pathway. ...Protein O-mannosyltransferases (PMTs) add mannose to serine/threonine (S/T)-rich proteins in the endoplasmic reticulum, facilitating proper folding and trafficking through the secretory pathway. These enzymes share a conserved architecture that includes a large transmembrane domain housing the catalytic pocket and a lumenal β-trefoil-folded MIR domain. Although S/T-rich regions in acceptor proteins are generally disordered, it remains unclear how PMTs selectively target these regions over other intrinsically disordered sequences. Here, using cryo-EM and X-ray crystallography, we demonstrate that the Saccharomyces cerevisiae Pmt4 dimer recognizes an S/T-rich peptide at two distinct sites. A groove above the catalytic pocket in the transmembrane domain binds the mannose-accepting S/T site, while the lumenal MIR domain engages an S/T-X-S/T motif. Notably, the substrate peptide is simultaneously bound by the catalytic pocket of one Pmt4 protomer and the MIR domain of the other, revealing an unexpected cooperative dual substrate recognition mechanism. This mechanism likely underpins the invariant dimeric architecture observed in all PMT family members.