Abstract
L-glutaminase is a hydrolytic enzyme with wide biotechnological applications. Mostly, these enzymes are employed in the feed industry for flavor enhancement and acrylamide mitigation. Also, L-glutaminase may have antiviral and antineoplastic effects making it a good choice for pharmaceutical applications. In this study, the strain Monascus ruber URM 8542 was identified through classical and molecular taxonomy using partial sequencing of β-tubulin and calmodulin genes. Subsequently, the optimal culture conditions were evaluated by submerged fermentation (L-glutamine 10 g.L− 1) for L-glutaminase excretion. The isolate was identified as M. ruber URM 8542 which showed significant extracellular enzyme production with a yield of 11.4 times in relation to the specific activity of intracellular L-glutaminase. Regarding the optimization experiments, several factors such as L-glutamine concentration, temperature, and pH were compared using a full factorial design (23). The concentrations greater than 1% proved to be significantly better for glutaminase production (R2 = 0.9077). Additionally, the L-glutaminase was optimally active at pH 7.0 and 30 ºC. The L-glutaminase was remarkably stable across an alkaline pH range (7.0–8.0) and had a thermal stability ranging from 30 ºC to 60 ºC for 1 h. Taken together, these findings suggest that the L-glutaminase produced by M. ruber is a promising candidate for pharmacological application, although further studies need to be performed. To the best of our knowledge, this is the first report of L-glutaminase production by Monascus ruber.
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Data Availability
Fungal strains are deposited in the URM culture collection (Micoteca URM Profa. Maria Auxiliadora Cavalcanti) located at the Federal University of Pernambuco (UFPE), Recife, Brazil.
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Acknowledgements
We would like to thank “Micoteca URM” Federal University de Pernambuco, Department of Mycology of the Federal University of Pernambuco for the support for the identification of the microorganism and Microorganism Biology Laboratory (BIOMICRO) of the Federal University of Paraiba for providing equipment and assistance in the enzymatic characterization analyses.
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This study received financial support from the Fundação de Amparo a Ciência e Tecnologia do Estado de Pernambuco – FACEPE (FACEPE-IBPG-1034-2.12/17; APQ-0350-2.12/19), Conselho Nacional de Desenvolvimento Científico e Tecnológico - CNPq (Processo: 310298/2018-0) and Financiadora de Estudos e Projetos – FINEP (nº 01.19.0171.00).
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Sarah S. do Nascimento: methodology, formal analysis and investigation, writing (preparation of the original draft); Emanuella M. da Conceição: classic morphological identification; Renan do N. Barbosa: molecular identification ande writing-review; Wellma de Oliveira Silva: writing-review; Leonor A. de O. da Silva: methodology, formal analysis and investigation, supervision; Cristina M. de Souza-Motta and Neiva T. de Oliveira: conceptualization, funding acquisition, supervision. All authors read and approved the manuscript.
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do Nascimento, S.S., Barbosa, R.d.N., de Oliveira Silva, W. et al. Optimization of L-glutaminase production by Monascus ruber URM 8542 isolated from ice cream industrial effluent. World J Microbiol Biotechnol 39, 288 (2023). https://doi.org/10.1007/s11274-023-03733-x
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DOI: https://doi.org/10.1007/s11274-023-03733-x