Work

Detecting the Orientation of Newly-Deposited Crystalline Cellulose with Fluorescent Cbm3

Year: 2022

Type: article

Abstract: Cellulose microfibril patterning influences many of the mechanical attributes of plant cell walls. We developed a simple, fluorescence microscopy-based method to detect the orientation of newlysynthesized cellulose microfibrils in epidermal peels of onion and Arabidopsis. It is based on Alexa Fluor488-tagged carbohydrate binding module 3a (CBM3a) from Clostridium thermocellum which displayed a 4-fold greater binding to cell walls at pH 5.5 compared with pH 8. Binding to isolated cellulose did not display this pH dependence. At pH 7.5 fibrillar patterns at the surface of the epidermal peels were visible, corresponding to the directionality of surface cellulose microfibrils, as verified by atomic force microscopy. The fibrillar pattern was not visible as the labeling intensity increased at lower pH. The pH of greatest cell wall labeling corresponds to the isoelectric point of CBM3a, suggesting that electrostatic forces limit CBM3a penetration into the wall. Consistent with this, digestion of the wall with pectate lyase to remove homogalacturonan increased labeling intensity. We conclude that electrostatic interactions strongly influence labeling of cell walls with CBM3 and potentially other proteins, holding implications for any work that relies on penetration of protein probes such asd CBMs, antibodies, or enzymes into charged polymeric substrates.

Source: The Cell Surface

DOI: 10.1016/j.tcsw.2022.100089

Authors: Sarah A. Pfaff, Xuan Wang, Edward R. Wagner, Liza A. Wilson, Sarah N. Kiemle, Daniel J. Cosgrove

Institution: Pennsylvania State University

Language: English

Topic: Polysaccharides and Plant Cell Walls

Subfield: Plant Science

Field: Agricultural and Biological Sciences

Domain: Life Sciences

Open Access status: gold

Estimated APC paid: $2,500

Funders: U.S. Department of Energy, Office of Science, Basic Energy Sciences