Summary
The nucleotide sequence of a 2.314 kb DNA segment containing a gene (cedl) expressing cellodextrinase activity from Butyrivibrio fibrisolvens H17c was determined. The B. fibrisolvens H17c gene was expressed from a weak internal promoter in Escherichia coli and a putative consensus promoter sequence was identified upstream of a ribosome binding site and a GTG start codon. The complete amino acid sequence (547 residues) was deduced and homology was demonstrated with the Clostridium thermocellum endoglucanase D (EGD), Pseudomonas fluorescens var. cellulose endoglucanase (EG), and a cellulase from the avocado fruit (Persea americana). The ced1 gene product Cedl showed cellodextrinase activity and rapidly hydrolysed short-chain cellodextrins to yield either cellobiose or cellobiose and glucose as end products. The Cedl enzyme released cellobiose from p-nitrophenyl-β-d-cellobioside and the enzyme was not inhibited by methylcellulose, an inhibitor of endoglucanase activity. Although the major activity of the Cedl enzyme was that of a cellodextrinase it also showed limited activity against endoglucanase specific substrates [carboxymethylcellulose (CMC), lichenan, laminarin and xylan]. Analysis by SDS-polyacrylamide gel electrophoresis with incorporated CMC showed a major activity band with an apparent M r of approximately 61000. The calculated M r of the ced1 gene product was 61023.
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Abbreviations
- Ap:
-
ampicillin
- ced1 :
-
gene coding for Ced1
- Ced1:
-
cellodextrinase from B. fibrisolvens
- CMC:
-
carboxymethylcellulose
- LB:
-
Luria Bertani
- ORF:
-
open reading frame
- pNPC:
-
p-nitrophenyl-β-d-cellobioside
- PC:
-
phosphate citrate
- HCA:
-
hydrophobic cluster analysis
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Communicated by H. Hennecke
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Berger, E., Jones, W.A., Jones, D.T. et al. Sequencing and expression of a cellodextrinase (ced1) gene from Butyrivibrio fibrisolvens H17c cloned in Escherichia coli . Molec. Gen. Genet. 223, 310–318 (1990). https://doi.org/10.1007/BF00265068
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DOI: https://doi.org/10.1007/BF00265068