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Biochemical and in silico structural characterization of a cold-active arginase from the psychrophilic yeast, Glaciozyma antarctica PI12

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Abstract

Glaciozyma antarctica PI12 is a psychrophilic yeast isolated from Antarctica. In this work, we describe the heterologous production, biochemical properties and in silico structure analysis of an arginase from this yeast (GaArg). GaArg is a metalloenzyme that catalyses the hydrolysis of l-arginine to l-ornithine and urea. The cDNA of GaArg was reversed transcribed, cloned, expressed and purified as a recombinant protein in Escherichia coli. The purified protein was active against l-arginine as its substrate in a reaction at 20 °C, pH 9. At 10–35 °C and pH 7–9, the catalytic activity of the protein was still present around 50%. Mn2+, Ni2+, Co2+ and K+ were able to enhance the enzyme activity more than two-fold, while GaArg is most sensitive to SDS, EDTA and DTT. The predicted structure model of GaArg showed a very similar overall fold with other known arginases. GaArg possesses predominantly smaller and uncharged amino acids, fewer salt bridges, hydrogen bonds and hydrophobic interactions compared to the other counterparts. GaArg is the first reported arginase that is cold-active, facilitated by unique structural characteristics for its adaptation of catalytic functions at low-temperature environments. The structure and function of cold-active GaArg provide insights into the potentiality of new applications in various biotechnology and pharmaceutical industries.

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Data availability

All sequences and structure coordinates reported are available by their GenBank accession numbers or Protein Data Bank identifier code, unless specifically stated otherwise

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Acknowledgements

We are grateful to the Malaysia Genome and Vaccine Institute (MGVI) for the use of facilities and staff support. This work was supported by the Ministry of Science, Technology and Innovation of Malaysia (MOSTI) [grant number 02-05-20-SF007/2].

Funding

Ministry of Science, Technology and Innovation of Malaysia (MOSTI), grant number 02-05-20-SF007/2

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Conceptualization: AMAM: methodology: NYY, DQHX: formal analysis and investigation: NYY, DQHX: writing—original draft preparation: NYY, DQHX: writing—review and editing: DQHX, NYY: funding acquisition: AMAM: resources: AMAM, MAJ: supervision: AMAM, FDAB, SK, RMIl, MFR, NMM.

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Correspondence to Nik Yusnoraini Yusof or Doris Huai Xia Quay.

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Communicated by Driessen.

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Yusof, N.Y., Quay, D.H.X., Kamaruddin, S. et al. Biochemical and in silico structural characterization of a cold-active arginase from the psychrophilic yeast, Glaciozyma antarctica PI12. Extremophiles 28, 15 (2024). https://doi.org/10.1007/s00792-024-01333-7

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  • DOI: https://doi.org/10.1007/s00792-024-01333-7

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