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| Content Provider | Springer Nature Link |
|---|---|
| Author | Morris, Daniel D. Gibbs, Moreland D. Ford, Michelle Thomas, Justin Bergquist, Peter L. |
| Copyright Year | 1999 |
| Abstract | Three family 10 xylanase genes (xynA, xynB, and xynC) and a single family 11 xylanase gene (xynD) were identified from the extreme thermophile Caldicellulosiruptor strain Rt69B.1 through the use of consensus PCR in conjunction with sequencing and polyacrylamide gel electrophoresis. These genes appear to comprise the complete endoxylanase system of Rt69B.1. The xynA gene was found to be homologous to the xynA gene of the closely related Caldicellulosiruptor strain Rt8B.4, and primers designed previously to amplify the Rt8B.4 xynA gene could amplify homologous full-length xynA gene fragments from Rt69B.1. The complete nucleotide sequences of the Rt69B.1 xynB, xynC, and xynD genes were obtained using genomic walking PCR. The full-length xynB and xynC genes are more than 5 kb in length and encode highly modular enzymes that are the largest xylanases reported to date. XynB has an architecture similar to the family 10 xylanases from Thermoanaerobacterium saccharolyticum (XynA) and Clostridium thermocellum (XynX) and may be cell wall associated, while XynC is a bifunctional enzyme with an architecture similar to the bifunctional β-glycanases from Caldicellulosiruptor saccharolyticus. The xynD gene encodes a two-domain family 11 xylanase that is identical in architecture to the XynB family 11 xylanase from the unrelated extreme thermophile Dictyoglomus thermophilum strain Rt46B.1. The sequence similarities between the Rt69B.1 xylanases with respect to their evolution are discussed. |
| Starting Page | 103 |
| Ending Page | 111 |
| Page Count | 9 |
| File Format | |
| ISSN | 14310651 |
| Journal | Extremophiles |
| Volume Number | 3 |
| Issue Number | 2 |
| Language | English |
| Publisher | Springer-Verlag |
| Publisher Date | 1999-05-10 |
| Publisher Place | Tokyo |
| Access Restriction | One Nation One Subscription (ONOS) |
| Content Type | Text |
| Resource Type | Article |
| Subject | Medicine Molecular Medicine Microbiology |
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