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A pectin methyltransferase modulates polysaccharide dynamics and interactions in Arabidopsis primary cell walls: Evidence from solid-state NMR

Journal Article · · Carbohydrate Polymers
 [1];  [2];  [3];  [4];  [5];  [6];  [2];  [3]
  1. Louisiana State University, Baton Rouge, LA (United States); OSTI
  2. Sichuan University, Chengdu (China)
  3. Louisiana State University, Baton Rouge, LA (United States)
  4. Pennsylvania State University, University Park, PA (United States); University of Georgia, Athens, GA (United States)
  5. Louisiana State University, Baton Rouge, LA (United States); Ningbo University, Zhejiang (China)
  6. Pennsylvania State University, University Park, PA (United States)

Plant cell walls contain cellulose embedded in matrix polysaccharides. Understanding carbohydrate structures and interactions is critical to the production of biofuel and biomaterials using these natural resources. Here we present a solid-state NMR study of cellulose and pectin in 13C-labeled cell walls of Arabidopsis wild-type and mutant plants. Using 1D 13C and 2D 13C–13C correlation experiments, we detected a highly branched arabinan structure in qua2 and tsd2 samples, two allelic mutants for a pectin methyltransferase. Both mutants show close physical association between cellulose and the backbones of pectic homogalacturonan and rhamnogalacturonan-I. Relaxation and dipolar order parameters revealed enhanced microsecond dynamics due to polymer disorder in the mutants, but restricted motional amplitudes due to tighter pectin-cellulose associations. These molecular data shed light on polymer structure and packing in these two pectin mutants, helping to elucidate how pectin could influence cell wall architecture at the nanoscale, cell wall mechanics, and plant growth.

Research Organization:
Pennsylvania State University, University Park, PA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0001090
OSTI ID:
1976908
Alternate ID(s):
OSTI ID: 1804567
Journal Information:
Carbohydrate Polymers, Journal Name: Carbohydrate Polymers Journal Issue: C Vol. 270; ISSN 0144-8617
Publisher:
Applied Science DirectCopyright Statement
Country of Publication:
United States
Language:
English

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