Table 2 Sequence and structure comparison of the eight-residue loops of family 11 xylanases
Enzyme abbreviation | Source | PDB code | Eight-residue loop sequence | Salt-bridge in the eight-residue loop | Optimum pH |
|---|---|---|---|---|---|
XynJ (∆XBD) | Bacillus sp. 41M-1 | 2DCK | QPSIKGTA | Lys135- Glu55 | 9 [17] |
Xyl C | alkalophilic Bacillus (NCL 87-6-10) | 2F6B | QPSIKGIA | Lys136-Glu56 | 8 [35] |
BadX | Bacillus agaradhaerens AC13 | 1H4G | QPSIKGIA | Lys136- Glu56 | 8 [36] |
Xyn11X | Bacillus subtilis B230 | 1IGO | QPSIIGIA | NA | 8 [37] |
Xyn11A-LC | Bacillus sp SN5 | 4IXL | QPSIEGTA | NA | 7.5 [18] |
XynA | Bacillus subtilis 168(1A1) | 1XXN | APSIDGDR | NA | 6–6.5 [38] |
Xyl1 | Streptomyces sp. S38 | 1HIX | APSVEGTK | NA | 6 [39] |
Bcx | Bacillus circulans | 1XNB | APSIDGDR | NA | 5.7 [40] |
Xyn2 | Hypocrea jecorina RUT-C30 | 1XYO | QPSIIGTA | NA | 5.3 [21] |
XYNI | Trichoderma reesei | 1XYN | EPSIQGTA | NA | 3.5 [41] |
XYL1 | Scytalidium acidophilum | 3M4F | EPSITGTS | NA | 3.2 [42] |
XynA | Aspergillus niger CBS 513.88 | 1UKR | EPSITGTS | NA | 3 [43] |
XynC | Aspergillus kawachii | 1BK1 | EPSITGTS | NA | 2 [44] |