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Thermus thermophilus as source of thermozymes for biotechnological applications: homologous expression and biochemical characterization of an alpha-galactosidase

Martina Aulitto ; Salvatore Fusco (Institutionen för biologi och bioteknik, Industriell bioteknik) ; Gabriella Fiorentino ; Danila Limauro ; Emilia Pedone ; Simonetta Bartolucci ; Patrizia Contursi
Microbial Cell Factories (14752859). Vol. 16 (2017), 1,
[Artikel, refereegranskad vetenskaplig]

Background: The genus Thermus, which has been considered for a long time as a fruitful source of biotechnological relevant enzymes, has emerged more recently as suitable host to overproduce thermozymes. Among these, alpha-galactosidases are widely used in several industrial bioprocesses that require high working temperatures and for which thermostable variants offer considerable advantages over their thermolabile counterparts. Results: Thermus thermophilus HB27 strain was used for the homologous expression of the TTP0072 gene encoding for an a-galactosidase (TtGalA). Interestingly, a soluble and active histidine-tagged enzyme was produced in larger amounts (5 mg/L) in this thermophilic host than in Escherichia coli (0.5 mg/L). The purified recombinant enzyme showed an optimal activity at 90 degrees C and retained more than 40% of activity over a broad range of pH (from 5 to 8). Conclusions: TtGalA is among the most thermoactive and thermostable a-galactosidases discovered so far, thus pointing to T. thermophilus as cell factory for the recombinant production of biocatalysts active at temperature values over 90 degrees C.

Nyckelord: Recombinant expression; Themostability; Thermozymes; Thermus thermophilus; α-Galactosidase

Denna post skapades 2017-03-03. Senast ändrad 2017-10-03.
CPL Pubid: 248384


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