Purification and characterization of two thermostable endo-1,4-β-D-xylanases from Thermotoga thermarum

Anwar Sunna, Jürgen Puls, Garabed Antranikian

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Abstract

Two thermoactive endoxylanases (1,4-β-D-xylan xylanohydrolase; EC 3.2.1.8) were purified from the xylanolytic enzyme system of the thermophilic anaerobic bacterium Thermotoga thermarum. The dimeric enzyme endoxylanase 1 (M(r) values of 105,000 and 150,000) shows maximal activity at 80°C and pH 6.0. Endoxylanase 2, which is composed of one subunit (M(r) of 35,000), is more thermoactive and possesses maximal activity between 90 and 100°C and at pH 7.0. Both enzymes are inactive towards CM-cellulose but, unlike endoxylanase 1, endoxylanase 2 is active towards galactomannan. The K(m) and V(max) values determined for endoxylanase 1 with 4-O-methyl-D-glucuronoxylan are 0.36 mg/ml and 1.18 units/mg of protein respectively. Endoxylanase 2, on the other hand, has a K(m) value of 0.24 mg/ml and a V(max) of 19.5 units/mg of protein.

LanguageEnglish
Pages177-185
Number of pages9
JournalBiotechnology and Applied Biochemistry
Volume24
Issue number2
Publication statusPublished - 1996
Externally publishedYes

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Endo-1,4-beta Xylanases
Purification
Enzymes
Proteins
Cellulose
Bacteria
Anaerobic Bacteria

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@article{9475311813b24e4087c7a8ba0e2a7a77,
title = "Purification and characterization of two thermostable endo-1,4-β-D-xylanases from Thermotoga thermarum",
abstract = "Two thermoactive endoxylanases (1,4-β-D-xylan xylanohydrolase; EC 3.2.1.8) were purified from the xylanolytic enzyme system of the thermophilic anaerobic bacterium Thermotoga thermarum. The dimeric enzyme endoxylanase 1 (M(r) values of 105,000 and 150,000) shows maximal activity at 80°C and pH 6.0. Endoxylanase 2, which is composed of one subunit (M(r) of 35,000), is more thermoactive and possesses maximal activity between 90 and 100°C and at pH 7.0. Both enzymes are inactive towards CM-cellulose but, unlike endoxylanase 1, endoxylanase 2 is active towards galactomannan. The K(m) and V(max) values determined for endoxylanase 1 with 4-O-methyl-D-glucuronoxylan are 0.36 mg/ml and 1.18 units/mg of protein respectively. Endoxylanase 2, on the other hand, has a K(m) value of 0.24 mg/ml and a V(max) of 19.5 units/mg of protein.",
author = "Anwar Sunna and J{\"u}rgen Puls and Garabed Antranikian",
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volume = "24",
pages = "177--185",
journal = "Biotechnology and Applied Biochemistry",
issn = "0885-4513",
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}

Purification and characterization of two thermostable endo-1,4-β-D-xylanases from Thermotoga thermarum. / Sunna, Anwar; Puls, Jürgen; Antranikian, Garabed.

In: Biotechnology and Applied Biochemistry, Vol. 24, No. 2, 1996, p. 177-185.

Research output: Contribution to journalArticleResearchpeer-review

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T1 - Purification and characterization of two thermostable endo-1,4-β-D-xylanases from Thermotoga thermarum

AU - Sunna, Anwar

AU - Puls, Jürgen

AU - Antranikian, Garabed

PY - 1996

Y1 - 1996

N2 - Two thermoactive endoxylanases (1,4-β-D-xylan xylanohydrolase; EC 3.2.1.8) were purified from the xylanolytic enzyme system of the thermophilic anaerobic bacterium Thermotoga thermarum. The dimeric enzyme endoxylanase 1 (M(r) values of 105,000 and 150,000) shows maximal activity at 80°C and pH 6.0. Endoxylanase 2, which is composed of one subunit (M(r) of 35,000), is more thermoactive and possesses maximal activity between 90 and 100°C and at pH 7.0. Both enzymes are inactive towards CM-cellulose but, unlike endoxylanase 1, endoxylanase 2 is active towards galactomannan. The K(m) and V(max) values determined for endoxylanase 1 with 4-O-methyl-D-glucuronoxylan are 0.36 mg/ml and 1.18 units/mg of protein respectively. Endoxylanase 2, on the other hand, has a K(m) value of 0.24 mg/ml and a V(max) of 19.5 units/mg of protein.

AB - Two thermoactive endoxylanases (1,4-β-D-xylan xylanohydrolase; EC 3.2.1.8) were purified from the xylanolytic enzyme system of the thermophilic anaerobic bacterium Thermotoga thermarum. The dimeric enzyme endoxylanase 1 (M(r) values of 105,000 and 150,000) shows maximal activity at 80°C and pH 6.0. Endoxylanase 2, which is composed of one subunit (M(r) of 35,000), is more thermoactive and possesses maximal activity between 90 and 100°C and at pH 7.0. Both enzymes are inactive towards CM-cellulose but, unlike endoxylanase 1, endoxylanase 2 is active towards galactomannan. The K(m) and V(max) values determined for endoxylanase 1 with 4-O-methyl-D-glucuronoxylan are 0.36 mg/ml and 1.18 units/mg of protein respectively. Endoxylanase 2, on the other hand, has a K(m) value of 0.24 mg/ml and a V(max) of 19.5 units/mg of protein.

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