Abstract
Adjacent regions of a Ruminococcus flavefaciens 17 DNA fragment were found to encode xylanase and beta(1,3-1,4)-glucanase activities. Sequencing of this fragment showed that both activities are encoded by a single 2,406-bp open reading frame corresponding to the xynD gene. The predicted product has a characteristic signal sequence that is followed by an amino-terminal domain related to family G xylanases, while the carboxy-terminal domain is related to beta(1,3-1,4)-glucanases from several other bacterial species. These two domains are connected by a region of unknown function that consists of 309 amino acids and includes a 30-amino-acid threonine-rich sequence. A polypeptide having a molecular weight of approximately 90,000 and exhibiting xylanase and beta(1,3-1,4)-glucanase activities was detected in Escherichia coli cells carrying the cloned xynD gene. This is one of the first cases in which a microbial polysaccharidase has been shown to carry separate catalytic domains active against different plant cell wall polysaccharides within the same polypeptide. xynD is one of a family of related genes in R. flavefaciens that encode enzymes having multiple catalytic domains, and the amino terminus of XYLD exhibits a high degree of similarity with the corresponding regions of another xylanase, XYLA, which carries two different xylanase catalytic domains.
| Original language | English |
|---|---|
| Pages (from-to) | 2943-2951 |
| Number of pages | 9 |
| Journal | Journal of Bacteriology |
| Volume | 175 |
| Issue number | 10 |
| Publication status | Published - May 1993 |
Keywords
- NUCLEOTIDE-SEQUENCE
- MOLECULAR-CLONING
- BACILLUS-PUMILUS
- BETA-GLUCANASE
- DNA-SEQUENCE
- EXPRESSION
- RUMEN
- BACTERIA
- SUBTILIS
Cite this
A BIFUNCTIONAL ENZYME, WITH SEPARATE XYLANASE AND BETA(1,3-1,4)-GLUCANASE DOMAINS, ENCODED BY THE XYND GENE OF RUMINOCOCCUS-FLAVEFACIENS. / FLINT, H J ; MARTIN, J ; MCPHERSON, C A ; DANIEL, A S ; ZHANG, J X .
In: Journal of Bacteriology, Vol. 175, No. 10, 05.1993, p. 2943-2951.Research output: Contribution to journal › Article
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TY - JOUR
T1 - A BIFUNCTIONAL ENZYME, WITH SEPARATE XYLANASE AND BETA(1,3-1,4)-GLUCANASE DOMAINS, ENCODED BY THE XYND GENE OF RUMINOCOCCUS-FLAVEFACIENS
AU - FLINT, H J
AU - MARTIN, J
AU - MCPHERSON, C A
AU - DANIEL, A S
AU - ZHANG, J X
PY - 1993/5
Y1 - 1993/5
N2 - Adjacent regions of a Ruminococcus flavefaciens 17 DNA fragment were found to encode xylanase and beta(1,3-1,4)-glucanase activities. Sequencing of this fragment showed that both activities are encoded by a single 2,406-bp open reading frame corresponding to the xynD gene. The predicted product has a characteristic signal sequence that is followed by an amino-terminal domain related to family G xylanases, while the carboxy-terminal domain is related to beta(1,3-1,4)-glucanases from several other bacterial species. These two domains are connected by a region of unknown function that consists of 309 amino acids and includes a 30-amino-acid threonine-rich sequence. A polypeptide having a molecular weight of approximately 90,000 and exhibiting xylanase and beta(1,3-1,4)-glucanase activities was detected in Escherichia coli cells carrying the cloned xynD gene. This is one of the first cases in which a microbial polysaccharidase has been shown to carry separate catalytic domains active against different plant cell wall polysaccharides within the same polypeptide. xynD is one of a family of related genes in R. flavefaciens that encode enzymes having multiple catalytic domains, and the amino terminus of XYLD exhibits a high degree of similarity with the corresponding regions of another xylanase, XYLA, which carries two different xylanase catalytic domains.
AB - Adjacent regions of a Ruminococcus flavefaciens 17 DNA fragment were found to encode xylanase and beta(1,3-1,4)-glucanase activities. Sequencing of this fragment showed that both activities are encoded by a single 2,406-bp open reading frame corresponding to the xynD gene. The predicted product has a characteristic signal sequence that is followed by an amino-terminal domain related to family G xylanases, while the carboxy-terminal domain is related to beta(1,3-1,4)-glucanases from several other bacterial species. These two domains are connected by a region of unknown function that consists of 309 amino acids and includes a 30-amino-acid threonine-rich sequence. A polypeptide having a molecular weight of approximately 90,000 and exhibiting xylanase and beta(1,3-1,4)-glucanase activities was detected in Escherichia coli cells carrying the cloned xynD gene. This is one of the first cases in which a microbial polysaccharidase has been shown to carry separate catalytic domains active against different plant cell wall polysaccharides within the same polypeptide. xynD is one of a family of related genes in R. flavefaciens that encode enzymes having multiple catalytic domains, and the amino terminus of XYLD exhibits a high degree of similarity with the corresponding regions of another xylanase, XYLA, which carries two different xylanase catalytic domains.
KW - NUCLEOTIDE-SEQUENCE
KW - MOLECULAR-CLONING
KW - BACILLUS-PUMILUS
KW - BETA-GLUCANASE
KW - DNA-SEQUENCE
KW - EXPRESSION
KW - RUMEN
KW - BACTERIA
KW - SUBTILIS
M3 - Article
VL - 175
SP - 2943
EP - 2951
JO - Journal of Bacteriology
JF - Journal of Bacteriology
SN - 0021-9193
IS - 10
ER -