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Planta

, Volume 237, Issue 1, pp 239–253 | Cite as

Enzymatic cell wall degradation of Chlorella vulgaris and other microalgae for biofuels production

  • Henri G. Gerken
  • Bryon Donohoe
  • Eric P. KnoshaugEmail author
Original Article

Abstract

Cell walls of microalgae consist of a polysaccharide and glycoprotein matrix providing the cells with a formidable defense against its environment. We characterized enzymes that can digest the cell wall and weaken this defense for the purpose of protoplasting or lipid extraction. A growth inhibition screen demonstrated that chitinase, lysozyme, pectinase, sulfatase, β-glucuronidase, and laminarinase had the broadest effect across the various Chlorella strains tested and also inhibited Nannochloropsis and Nannochloris strains. Chlorella is typically most sensitive to chitinases and lysozymes, both enzymes that degrade polymers containing N-acetylglucosamine. Using a fluorescent DNA stain, we developed rapid methodology to quantify changes in permeability in response to enzyme digestion and found that treatment with lysozyme in conjunction with other enzymes has a drastic effect on cell permeability. Transmission electron microscopy of enzymatically treated Chlorella vulgaris indicates that lysozyme degrades the outer surface of the cell wall and removes hair-like fibers protruding from the surface, which differs from the activity of chitinase. This action on the outer surface of the cell causes visible protuberances on the cell surface and presumably leads to the increased settling rate when cells are treated with lysozyme. We demonstrate radical ultrastructural changes to the cell wall in response to treatment with various enzyme combinations which, in some cases, causes a greater than twofold increase in the thickness of the cell wall. The enzymes characterized in this study should prove useful in the engineering and extraction of oils from microalgae.

Keywords

Growth inhibition Permeability Lysozyme Nitrogen depletion 

Abbreviations

NREL

National renewable energy laboratory

TFA

Triflouroacetic acid

TLS

Trilaminar structure

TEM

Transmission electron microscopy

CCAP

Culture collection of algae and protozoa

NCMA

Formerly CCMP, Provasoli-Guillard National Center for marine algae and microbiota

ATCC

American type culture collection

UTEX

Culture collection of algae at the University of Texas at Austin

ASP

NREL Aquatic species program

mBBM

Modified bold’s basal medium

ASW

Artificial seawater

PBS

Phosphate buffered saline

SEM

Scanning electron microscopy

Notes

Acknowledgments

The authors would like to thank Jonathan Meuser for help with 18S RNA gene sequencing, Ben Smith for help with quantification of settling, Todd Vinzant and the Biomass Surface Characterization Laboratory at NREL for help in SEM image acquisition, and Philip Pienkos for technical discussions and manuscript review. This project was funded by NREL’s Laboratory Directed Research and Development program.

Supplementary material

425_2012_1765_MOESM1_ESM.pdf (811 kb)
Supplementary material 1 (PDF 810 kb)

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Copyright information

© Springer-Verlag Berlin Heidelberg (outside the USA) 2012

Authors and Affiliations

  • Henri G. Gerken
    • 1
    • 3
  • Bryon Donohoe
    • 2
  • Eric P. Knoshaug
    • 1
    Email author
  1. 1.National Renewable Energy LaboratoryNational Bioenergy CenterGoldenUSA
  2. 2.National Renewable Energy LaboratoryBiosciences CenterGoldenUSA
  3. 3.Laboratory for Algae Research and BiotechnologyArizona State UniversityMesaUSA

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