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Revision as of 15:50, 10 October 2021


Keratinase kerAvDZ50

KerAVDZ50 is an extracellular serine thiol alkaline protease from the Actinomadura viridilutea strain, which can be isolated from the Algerian fishing port [1]. As a thermo-alkaline keratinases, it can function at a pH range of 7–12 and a temperature range of 35–80 °C.

6x His-tags were added to both sides of the sequence for purification, and constructed into PET-28a(+) (BBa_K3895007). The length of KerAVDZ50 is 1218bp.

Figure 1. Plasmid construction of KerAVDZ50.
Figure 2. PCR and gel electrophoresis of KerAVDZ50.
Name of keratinase IPTG concentration/mM Temperature/°C Time/h
KerAVDZ50 0.67139 16 12

Modeling

The biological activity of a protein is not only determined by the primary structure of the protein molecule but also closely related to its specific spatial structure. Elucidating the process of protein folding in functional and structural details will be of great significance to evaluate their keratinotic functions. According to the amino acid sequences in the enzyme active sites and associated catalytic mechanisms, proteases can be classified into seven broad groups: serine, cysteine, threonine, aspartic and glutamic proteases, metalloproteases and asparagine peptide lyases. According to the nature of their active site, keratinases belong to serine- and metalloproteases or serine metalloproteases. Moreover, the enzymatic degradation of keratin is a multistage process that requires the following steps: adsorption of the keratinases to the surface of macromolecule by electrostatic and hydrophobic interactions, followed by catalytic action [2]. Hence we used Swiss Model to predict their hydrophobic region and serine groups.

T--SZ SHD--Z50Quality comparison.jpg T--SZ SHD--Z50Quality comparison2.jpg
Figure 1. Swiss Model showing serine residues of KerAVDZ50.
Figure 2. Swiss Model showing hydrophobisity of KerAVDZ50.
Figure 3. Ramachandran Plot of KerAVDZ50.Z50 Ramachandran Favoured is 95.14%


Sequence and Features


Assembly Compatibility:
  • 10
    COMPATIBLE WITH RFC[10]
  • 12
    INCOMPATIBLE WITH RFC[12]
    Illegal NheI site found at 577
  • 21
    COMPATIBLE WITH RFC[21]
  • 23
    COMPATIBLE WITH RFC[23]
  • 25
    INCOMPATIBLE WITH RFC[25]
    Illegal AgeI site found at 382
    Illegal AgeI site found at 1120
  • 1000
    INCOMPATIBLE WITH RFC[1000]
    Illegal BsaI.rc site found at 322


References

Biochemical and molecular characterization of new keratinoytic protease from Actinomadura viridilutea DZ50. (n.d.). International Journal of Biological Macromolecules, 92, 299–315. https://doi.org/10.1016/j.ijbiomac.2016.07.009 Vidmar, Beti, and Maša Vodovnik. “Microbial Keratinases: Enzymes with Promising Biotechnological Applications.” Food technology and biotechnology vol. 56,3 (2018): 312-328. doi:10.17113/ftb.56.03.18.5658