期刊
BIOMACROMOLECULES
卷 23, 期 9, 页码 3663-3677出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.biomac.2c00550
关键词
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资金
- Center for Lignocellulose Structure and Formation, an Energy Frontier Research Center - U.S. Department of Energy, Office of Science, Basic Energy Sciences [DE-SC0001090, P41 GM109824, P41 GM103314]
- Center for Lignocellulose Structure and Formation, an Energy Frontier Research Center - U.S. Department of Energy, Office of Science, Basic Energy Sciences [DE-SC0001090, P41 GM109824, P41 GM103314]
Higher plants use membrane-bound cellulose synthase complexes to synthesize cellulose, with homomeric trimers possibly playing an important role in cell wall synthesis, and key residues for future studies have been identified.
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 fulllength CESA8 and CESA7 of poplar and cotton, respectively. In both structures, a small portion of the plant-conserved region (PCR) 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.
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