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Open data
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Basic information
Entry | ![]() | |||||||||
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Title | Hybrid aspen cellulose synthase-8 bound to UDP | |||||||||
![]() | autosharpened map local refinement in cryosparc | |||||||||
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![]() | Cellulose / cell wall / UDP / PLANT PROTEIN / Transferase | |||||||||
Function / homology | ![]() plant-type primary cell wall biogenesis / cellulose synthase (UDP-forming) / cellulose synthase (UDP-forming) activity / cellulose biosynthetic process / trans-Golgi network / cell wall organization / metal ion binding / plasma membrane Similarity search - Function | |||||||||
Biological species | ![]() ![]() | |||||||||
Method | single particle reconstruction / cryo EM / Resolution: 3.3 Å | |||||||||
![]() | Verma P / Zimmer J | |||||||||
Funding support | ![]()
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![]() | ![]() Title: Insights into substrate coordination and glycosyl transfer of poplar cellulose synthase-8. Authors: Preeti Verma / Albert L Kwansa / Ruoya Ho / Yaroslava G Yingling / Jochen Zimmer / ![]() Abstract: Cellulose is an abundant cell wall component of land plants. It is synthesized from UDP-activated glucose molecules by cellulose synthase, a membrane-integrated processive glycosyltransferase. ...Cellulose is an abundant cell wall component of land plants. It is synthesized from UDP-activated glucose molecules by cellulose synthase, a membrane-integrated processive glycosyltransferase. Cellulose synthase couples the elongation of the cellulose polymer with its translocation across the plasma membrane. Here, we present substrate and product-bound cryogenic electron microscopy structures of the homotrimeric cellulose synthase isoform-8 (CesA8) from hybrid aspen (poplar). UDP-glucose binds to a conserved catalytic pocket adjacent to the entrance to a transmembrane channel. The substrate's glucosyl unit is coordinated by conserved residues of the glycosyltransferase domain and amphipathic interface helices. Site-directed mutagenesis of a conserved gating loop capping the active site reveals its critical function for catalytic activity. Molecular dynamics simulations reveal prolonged interactions of the gating loop with the substrate molecule, particularly across its central conserved region. These transient interactions likely facilitate the proper positioning of the substrate molecule for glycosyl transfer and cellulose translocation. HIGHLIGHTS: Cryo-EM structures of substrate and product bound poplar cellulose synthase provide insights into substrate selectivitySite directed mutagenesis signifies a critical function of the ...HIGHLIGHTS: Cryo-EM structures of substrate and product bound poplar cellulose synthase provide insights into substrate selectivitySite directed mutagenesis signifies a critical function of the gating loop for catalysisMolecular dynamics simulations support persistent gating loop - substrate interactionsGating loop helps in positioning the substrate molecule to facilitate cellulose elongationConserved cellulose synthesis substrate binding mechanism across the kingdoms. | |||||||||
History |
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Structure visualization
Supplemental images |
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Downloads & links
-EMDB archive
Map data | ![]() | 223.9 MB | ![]() | |
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Header (meta data) | ![]() ![]() | 15 KB 15 KB | Display Display | ![]() |
Images | ![]() | 68.2 KB | ||
Filedesc metadata | ![]() | 6 KB | ||
Others | ![]() ![]() | 226.8 MB 226.8 MB | ||
Archive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 8g27MC ![]() 8g2jC M: atomic model generated by this map C: citing same article ( |
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Similar structure data | Similarity search - Function & homology ![]() |
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Links
EMDB pages | ![]() ![]() |
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Related items in Molecule of the Month |
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Map
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Annotation | autosharpened map local refinement in cryosparc | ||||||||||||||||||||
Voxel size | X=Y=Z: 0.88 Å | ||||||||||||||||||||
Density |
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Symmetry | Space group: 1 | ||||||||||||||||||||
Details | EMDB XML:
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-Supplemental data
-Half map: half map
File | emd_29678_half_map_1.map | ||||||||||||
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Annotation | half map | ||||||||||||
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Density Histograms |
-Half map: half map B
File | emd_29678_half_map_2.map | ||||||||||||
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Annotation | half map B | ||||||||||||
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Sample components
-Entire : Homotrimeric cellulose synthase complex
Entire | Name: Homotrimeric cellulose synthase complex |
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Components |
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-Supramolecule #1: Homotrimeric cellulose synthase complex
Supramolecule | Name: Homotrimeric cellulose synthase complex / type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1 |
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Source (natural) | Organism: ![]() ![]() |
-Macromolecule #1: Cellulose synthase
Macromolecule | Name: Cellulose synthase / type: protein_or_peptide / ID: 1 / Number of copies: 3 / Enantiomer: LEVO / EC number: cellulose synthase (UDP-forming) |
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Source (natural) | Organism: ![]() ![]() |
Molecular weight | Theoretical: 112.483023 KDa |
Recombinant expression | Organism: ![]() ![]() |
Sequence | String: MHHHHHHHHH HHHMMESGAP ICHTCGEQVG HDANGDLFVA CHECNYHICK SCFEYEIKEG RKVCLRCGSP YDENLLDDVE KKGSGNQST MASHLNNSQD VGIHARHISS VSTVDSEMND EYGNPIWKNR VESWKDKRNK KKKSNTKPET EPAQVPPEQQ M ENKPSAEA ...String: MHHHHHHHHH HHHMMESGAP ICHTCGEQVG HDANGDLFVA CHECNYHICK SCFEYEIKEG RKVCLRCGSP YDENLLDDVE KKGSGNQST MASHLNNSQD VGIHARHISS VSTVDSEMND EYGNPIWKNR VESWKDKRNK KKKSNTKPET EPAQVPPEQQ M ENKPSAEA SEPLSIVYPI PRNKLTPYRA VIIMRLIILG LFFHYRITNP VDSAFGLWLT SVICEIWFAF SWVLDQFPKW KP VNRETFI ERLSARYERE GEPSQLAAVD FFVSTVDPLK EPPLITANTV LSILAVDYPV DKVSCYVSDD GAAMLTFESL VET AEFARK WVPFCKKFSI EPRAPEFYFS QKIDYLKDKV QPSFVKERRA MKRDYEEYKV RVNALVAKAQ KTPDEGWTMQ DGTP WPGNN TRDHPGMIQV FLGNTGARDI EGNELPRLVY VSREKRPGYQ HHKKAGAENA LVRVSAVLTN APYILNLDCD HYVNN SKAV REAMCILMDP QVGRDVCYVQ FPQRFDGIDR SDRYANRNIV FFDVNMKGLD GIQGPMYVGT GCVFNRQALY GYGPPS MPR LRKGKESSSC FSCCCPTKKK PAQDPAEVYR DAKREDLNAA IFNLTEIDNY DDYERSMLIS QLSFEKTFGL SPVFIES TL MENGGVPESA NSSTLIKEAI HVIGCGFEEK TEWGKEIGWI YGSVTEDILS GFKMHCRGWR SIYCMPVRPA FKGSAPIN L SDRLHQVLRW ALGSVEIFFS RHCPFWYGYG GGRLKWLQRL AYINTIVYPF TSLPLIAYCT IPAVCLLTGK FIIPTLSNL ASMLFLGLFI SIIVTAVLEL RWSGVSIEDL WRNEQFWVIG GVSAHLFAVF QGFLKMLAGI DTNFTVTAKA ADDTEFGELY MVKWTTLLI PPTTLLIINI VGVVAGFSDA LNKGYEAWGP LFGKVFFAFW VILHLYPFLK GLMGRQNRTP TIVVLWSVLL T SVFSLVWV KINPFVNKVD NTLAGETCIS IDC UniProtKB: Cellulose synthase |
-Macromolecule #3: URIDINE-5'-DIPHOSPHATE
Macromolecule | Name: URIDINE-5'-DIPHOSPHATE / type: ligand / ID: 3 / Number of copies: 3 / Formula: UDP |
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Molecular weight | Theoretical: 404.161 Da |
Chemical component information | ![]() ChemComp-UDP: |
-Macromolecule #4: MAGNESIUM ION
Macromolecule | Name: MAGNESIUM ION / type: ligand / ID: 4 / Number of copies: 6 / Formula: MG |
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Molecular weight | Theoretical: 24.305 Da |
-Macromolecule #5: water
Macromolecule | Name: water / type: ligand / ID: 5 / Number of copies: 2 / Formula: HOH |
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Molecular weight | Theoretical: 18.015 Da |
Chemical component information | ![]() ChemComp-HOH: |
-Experimental details
-Structure determination
Method | cryo EM |
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![]() | single particle reconstruction |
Aggregation state | particle |
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Sample preparation
Buffer | pH: 7.5 |
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Vitrification | Cryogen name: ETHANE |
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Electron microscopy
Microscope | FEI TITAN KRIOS |
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Image recording | Film or detector model: GATAN K3 BIOQUANTUM (6k x 4k) / Average electron dose: 15.0 e/Å2 |
Electron beam | Acceleration voltage: 300 kV / Electron source: ![]() |
Electron optics | Illumination mode: OTHER / Imaging mode: OTHER / Nominal defocus max: 0.8 µm / Nominal defocus min: 2.3000000000000003 µm |
Experimental equipment | ![]() Model: Titan Krios / Image courtesy: FEI Company |
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Image processing
Startup model | Type of model: EMDB MAP EMDB ID: |
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Final reconstruction | Resolution.type: BY AUTHOR / Resolution: 3.3 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 188722 |
Initial angle assignment | Type: MAXIMUM LIKELIHOOD / Software - Name: cryoSPARC (ver. 2.8.1) |
Final angle assignment | Type: MAXIMUM LIKELIHOOD |