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Biochem Biophys Res Commun. 2019 Feb 5;509(2):506-513. doi: 10.1016/j.bbrc.2018.12.121. Epub 2018 Dec 27.

Classification of microbial transglutaminases by evaluation of evolution trees, sequence motifs, secondary structure topology and conservation of potential catalytic residues.

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Istituto di Scienze dell'Alimentazione, CNR, via Roma 64, 83100, Avellino, Italy; Dottorato di Ricerca in "Innovazione e management di alimenti ad elevata valenza salutistica", Università degli Studi di Foggia, Italy.
Istituto di Scienze dell'Alimentazione, CNR, via Roma 64, 83100, Avellino, Italy. Electronic address:


Despite the growing interest for microbial transglutaminases (TGases), and the large number of genome sequencing data, there is no deep investigation about structural properties within this family of enzymes in bacteria. We performed a classification of microbial TGases, starting from large-scale analysis of all protein sequences annotated as TGase (more than 8000) in database PFAM. We developed a reiterative procedure based on the construction of several phylogenetic trees and manual selection, and detected five main groups of microbial TGases. Searches for sequence motifs evidenced strong conservation in regions containing potential catalytic residues for some groups. Protein structure modelling has been possible for three of the five groups. Analyses of motifs, structural topologies and potential catalytic sites suggest possible interpretations for function similarities and divergences among groups.


Catalytic triad; Microbial transglutaminase; Motif conservation; Topology


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