Characterization and structural analysis of a thermophilic GH11 xylanase from compost metatranscriptome.
Appl Microbiol Biotechnol
; 105(20): 7757-7767, 2021 Oct.
Article
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| MEDLINE
| ID: mdl-34553251
ABSTRACT
Xylanase is efficient for xylan degradation and widely applied in industries. We found a GH11 family xylanase (Xyn11A) with high thermostability and catalytic activity from compost metatranscriptome. This xylanase has the optimal reaction temperature at 80 °C with the activity of 2907.3 U/mg. The X-ray crystallographic structure shows a typical "right hand" architecture, which is the characteristics of the GH11 family enzymes. Comparing it with the mesophilic XYN II, a well-studied GH11 xylanase from Trichoderma reesei, Xyn11A is more compact with more H-bonds. Our mutagenic results show that the electrostatic interactions in the thumb and palm region of Xyn11A could result in its high thermostability and activity. Introducing a disulfide bond at the N-terminus further increased its optimal reaction temperature to 90 °C with augmented activity. KEY POINTS ⢠A hyperthermophilic xylanase with high activity was discovered using the metatranscriptomic method. ⢠The mechanisms of thermophilicity and high activity were revealed using X-ray crystallography, mutagenesis, and molecular dynamics simulations. ⢠The thermostability and activity were further improved by introducing a disulfide bond.
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1
Colección:
01-internacional
Banco de datos:
MEDLINE
Asunto principal:
Compostaje
/
Endo-1,4-beta Xilanasas
Idioma:
En
Revista:
Appl Microbiol Biotechnol
Año:
2021
Tipo del documento:
Article