Evidence for Plant-Conserved Region Mediated Trimeric CESAs in Plant Cellulose Synthase Complexes.

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  • Additional Information
    • Source:
      Publisher: American Chemical Society Country of Publication: United States NLM ID: 100892849 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1526-4602 (Electronic) Linking ISSN: 15257797 NLM ISO Abbreviation: Biomacromolecules Subsets: MEDLINE
    • Publication Information:
      Original Publication: Washington, DC : American Chemical Society, c2000-
    • Subject Terms:
      Arabidopsis*/genetics ; Arabidopsis Proteins*; Cell Wall ; Cellulose ; Glucosyltransferases/chemistry ; Glucosyltransferases/genetics
    • Abstract:
      Higher plants synthesize cellulose using membrane-bound, six-lobed cellulose synthase complexes, each lobe containing trimeric cellulose synthases (CESAs). Although molecular biology reports support heteromeric trimers composed of different isoforms, a homomeric trimer was reported for in vitro studies of the catalytic domain of CESA1 of Arabidopsis (AtCESA1CatD) and confirmed in cryoEM structures of full-length CESA8 and CESA7 of poplar and cotton, respectively. In both structures, a small portion of the plant-conserved region (P-CR) forms the only contacts between catalytic domains of the monomers. We report inter-subunit lysine-crosslinks that localize to the small P-CR, negative-stain EM structure, and modeling data for homotrimers of AtCESA1CatD. Molecular dynamics simulations for AtCESA1CatD trimers based on the CESA8 cryoEM structure were stable and dependent upon a small set of residue contacts. The results suggest that homomeric CESA trimers may be important for the synthesis of primary and secondary cell walls and identify key residues for future mutagenic studies.
    • Grant Information:
      P41 GM109824 United States GM NIGMS NIH HHS; P41 GM103314 United States GM NIGMS NIH HHS
    • Accession Number:
      0 (Arabidopsis Proteins)
      9004-34-6 (Cellulose)
      EC 2.4.1.- (CESA8 protein, Arabidopsis)
      EC 2.4.1.- (Glucosyltransferases)
      EC 2.4.1.- (cellulose synthase)
    • Publication Date:
      Date Created: 20220810 Date Completed: 20220913 Latest Revision: 20220921
    • Publication Date:
      20240105
    • Accession Number:
      10.1021/acs.biomac.2c00550
    • Accession Number:
      35948425