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Appl. Environ. Microbiol., Apr 1995, 1399-1407, Vol 61, No. 4
Copyright © 1995, American Society for Microbiology

Purification of Thermotoga maritima enzymes for the degradation of cellulosic materials

K Bronnenmeier, A Kern, W Liebl and WL Staudenbauer
Institut fur Mikrobiologie, Technische Universitat Munchen, Federal Republic of Germany.

A separation procedure for the analysis of the enzyme components of the hyperthermophilic bacterium Thermotoga maritima involved in cellulose and xylan degradation was developed. Resolution of the enzymes was achieved by a combination of fast protein liquid chromatography anion exchange and hydrophobic interaction chromatography. Enzyme fractions were assayed for hydrolysis of Avicel, carboxymethylcellulose (CMC), beta-glucan, laminarin, xylan, p-nitrophenyl-beta-D-glucoside, p- nitrophenyl-beta-D-cellobioside, p-nitrophenyl-beta-D-xyloside, p- nitrophenyl-alpha-L-arabinofuranoside, and 4-O-methyl-glucuronosyl- xylotriose. The activities of two cellulases, one laminarinase, one xylanase, two putative beta-D-xylosidases, alpha-D-glucuronidase, and alpha-L-arabinosidase were identified. Because of their selective retardation on a Superdex gel filtration column, the two cellulases could be purified to homogeneity. According to sodium dodecyl sulfate- polyacrylamide gel electrophoresis, molecular masses of 27 and 29 kDa, respectively, were determined for cellulase I and cellulase II. Maximal activities of both enzymes were observed at 95 degree C between pH 6.0 and 7.5. In the presence of 2.5 M NaC1 the purified enzymes retained about 90% of their initial activities after a 6-h incubation at 80 degree C. On the basis of its activity towards CMC, cellulase I was classified as endo-beta-1,4-glucanase. Cellulase II was able to attack Avicel in addition to CMC, beta-glucan, and p-nitrophenyl-beta-D- cellobioside. It releases cellobiose and cellotriose from Avicel. The latter product is further cleaved into glucose and cellobiose. Cellulase II may therefore be classified as exo-beta-1,4-glucanase.

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