Download MendeleyIncorporation of Copper Ions into T2/T3 Centers of Two-Domain Laccases.
Gabdulkhakov, A.G., Kostareva, O.S., Kolyadenko, I.A., Mikhaylina, A.O., Trubitsina, L.I., Tishchenko, S.V.(2018) Mol Biol (Mosk) 52: 29-35
- PubMed: 29512633
- DOI: https://doi.org/10.7868/S0026898418010056
- Primary Citation of Related Structures:
5O3K, 5O4I, 5O4Q - PubMed Abstract:
Laccase belongs to the family of copper-containing oxidases. A study was made of the mechanism that sustains the incorporation of copper ions into the T2/T3 centers of recombinant two-domain laccase Streptomyces griseoflavus Ac-993. The occupancy of the T3 center by copper ions was found to increase with an increasing copper content in the culture medium and after dialysis of the protein preparation against a copper sulfate-containing buffer. The T2 center was filled only when overproducer strain cells were grown at a higher copper concentration in the medium. Two-domain laccases were assumed to possess a channel that serves to deliver copper ions to the T3 center during the formation of the three-dimensional laccase conformation and dialysis of the protein preparation. A narrower channel leads to the T2 center in two-domain laccases compared with three-domain ones, rendering the center less accessible for copper atoms. The incorporation of copper ions into the T2 center of two-domain laccases is likely to occur in the course of their biosynthesis or the formation of a functional trimer.
Organizational Affiliation:
Institute of Protein Research, Russian Academy of Sciences, Pushchino, Moscow oblast, 142290 Russia.
