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Cellobionic acid utilization: from Neurospora crassa to Saccharomyces cerevisiae

Journal Article · · Biotechnology for Biofuels
 [1];  [2];  [3];  [4];  [3];  [5]
  1. Univ. of California, Berkeley, CA (United States). Dept. of Molecular and Cell Biology; DOE/OSTI
  2. Univ. of California, Berkeley, CA (United States). Dept. of Plant and Microbial Biology
  3. Univ. of California, Berkeley, CA (United States). Dept. of Molecular and Cell Biology
  4. Univ. of California, Berkeley, CA (United States). Dept. of Chemistry
  5. Univ. of California, Berkeley, CA (United States). Dept. of Molecular and Cell Biology; Univ. of California, Berkeley, CA (United States). Dept. of Chemistry; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Physical Biosciences Division
Background: Economical production of fuels and chemicals from plant biomass requires the efficient use of sugars derived from the plant cell wall. Neurospora crassa, a model lignocellulosic degrading fungus, is capable of breaking down the complex structure of the plant cell wall. In addition to cellulases and hemicellulases, N. crassa secretes lytic polysaccharide monooxygenases (LPMOs), which cleave cellulose by generating oxidized sugars—particularly aldonic acids. However, the strategies N. crassa employs to utilize these sugars are unknown. Results: We identified an aldonic acid utilization pathway in N. crassa, comprised of an extracellular hydrolase (NCU08755), cellobionic acid transporter (CBT-1, NCU05853) and cellobionic acid phosphorylase (CAP, NCU09425). Extracellular cellobionic acid could be imported directly by CBT-1 or cleaved to gluconic acid and glucose by a β-glucosidase (NCU08755) outside the cells. Intracellular cellobionic acid was further cleaved to glucose 1-phosphate and gluconic acid by CAP. However, it remains unclear how N. crassa utilizes extracellular gluconic acid. The aldonic acid pathway was successfully implemented in Saccharomyces cerevisiae when N. crassa gluconokinase was coexpressed, resulting in cellobionic acid consumption in both aerobic and anaerobic conditions. Conclusions: We successfully identified a branched aldonic acid utilization pathway in N. crassa and transferred its essential components into S. cerevisiae, a robust industrial microorganism.
Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1626965
Journal Information:
Biotechnology for Biofuels, Journal Name: Biotechnology for Biofuels Journal Issue: 1 Vol. 8; ISSN 1754-6834
Publisher:
BioMed CentralCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (5)

A fungal transcription factor essential for starch degradation affects integration of carbon and nitrogen metabolism journal May 2017
Enzymes Involved in the Biodegradation of Sugarcane Biomass: Challenges and Perspectives book January 2017
AA9 and AA10: from enigmatic to essential enzymes journal October 2015
An aldonolactonase AltA from Penicillium oxalicum mitigates the inhibition of β-glucosidase during lignocellulose biodegradation journal February 2017
Efficient production of sugar-derived aldonic acids by Pseudomonas fragi TCCC11892 journal January 2018


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