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Comparative investigation of bacterial thermoalkaliphilic GH11 xylanases at molecular phylogeny, sequence and structure level

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Abstract

Thermoalkaliphilic GH11 xylanases are largely favored for paper pulp biobleaching process. The present work aimed to comparatively investigate the molecular phylogeny, amino acid sequences, molecular structure, and enzyme–substrate interaction of six thermoalkaliphilic GH11 xylanases from different bacterial species (Oxalobacteraceae bacterium xylanase = ObXyl, Sphingomonas sp. xylanase = SsXyl, Hymenobacter sp. xylanase = HsXyl, Amycolatopsis vastitatis xylanase = AvXyl, Lentzea deserti xylanase = LdXyl, Streptomyces rubellomurinus xylanase = SrXyl). For this purpose, six bacterial thermoalkaliphilic GH11 xylanase sequences derived from unreviewed protein entries of UniProt/TrEMBL database were analyzed for their phylogenetic relationships and sequence similarities. Also, 3D predicted structures of the enzymes were built and computationally validated by different bioinformatics tools. The enzyme–substrate interactions were investigated by molecular docking analysis using various substrates. Phylogenetic analysis showed that six enzymes were grouped into two different clusters: the first cluster included ObXyl, SsXyl, and HsXyl, whereas the second cluster had AvXyl, LdXyl, and SrXyl. Multiple sequence alignment showed that the second cluster xylanases possessed longer N-terminal regions indicating higher thermostability, compared to the first cluster xylanases. The structural analyses showed that six predicted structures were largely conserved. Molecular docking results indicated that binding efficiency to xylotriose, xylotetraose, and xylopentaose was higher in second cluster enzymes than that in first cluster enzymes, exhibiting mostly above -8.0 kCal/mol of binding energy. Arginine in B8 β-strand was commonly involved in substrate interactions in all the second cluster xylanases, different from the first cluster ones. Thus, the present work predicted that the thermoalkaliphilic xylanases in the second cluster might be greater potential candidates for the paper pulp bleaching process.

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Abbreviations

CAZy:

Carbohydrate Active Enzymes

GH:

Glycoside Hydrolase

WGS:

Whole-Genome Shotgun WGS

pI:

Isoelectric Point

Tm :

Melting Temperature

NCR:

Negatively Charged Residues

PCR:

Positively Charged Residues

ML:

Maximum Likelihood

JTT:

Jones-Taylor-Thornton

LGA:

Lamarckian Genetic Algorithm

SDF:

Spatial Data File

PDB:

Protein Data Bank

ObXyl:

Oxalobacteraceae Bacterium xylanase

SsXyl:

Sphingomonas sp. Xylanase

HsXyl:

Hymenobacter sp. Xylanase

AvXyl:

Amycolatopsis vastitatis Xylanase

LdXyl:

Lentzea deserti Xylanase

SrXyl:

Streptomyces rubellomurinus Xylanase

Tx-xyl:

Xylanase from Thermobacillus xylanilyticus

GMQE:

Global Model Quality Estimate

UniProt:

The Universal Protein Knowledgebase

X2 :

Xylobiose

X3 :

Xylotriose

X4 :

Xylotetraose

X5 :

Xylopentaose

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Acknowledgements

The author would like to thank Tekirdağ Namık Kemal University for its contribution to the access to the full-text articles.

Funding

This research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors.

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Correspondence to Yusuf Sürmeli.

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Sürmeli, Y. Comparative investigation of bacterial thermoalkaliphilic GH11 xylanases at molecular phylogeny, sequence and structure level. Biologia 77, 3241–3253 (2022). https://doi.org/10.1007/s11756-022-01169-6

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  • DOI: https://doi.org/10.1007/s11756-022-01169-6

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