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Recombinant l-glutaminase obtained from Geobacillus thermodenitrificans DSM-465: characterization and in silico elucidation of conserved structural domains

Glutaminase (GLS) is an enzyme essential for amino acid metabolism; in particular, it acts as a catalyst in glutaminolysis, a reaction exploited by the malignant cells to meet the nutrient requirements for their accelerated growth and proliferation. Via regulating the initial reaction of the glutami...

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Autores principales: Shah, Luqman, Nadeem, Muhammad Shahid, Khan, Jalaluddin Azam, Zeyadi, Mustafa A., Zamzami, Mazin A., Mohammed, Kaleemuddin
Formato: Online Artículo Texto
Lenguaje:English
Publicado: The Royal Society of Chemistry 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9060542/
https://www.ncbi.nlm.nih.gov/pubmed/35520186
http://dx.doi.org/10.1039/c8ra04740e
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author Shah, Luqman
Nadeem, Muhammad Shahid
Khan, Jalaluddin Azam
Zeyadi, Mustafa A.
Zamzami, Mazin A.
Mohammed, Kaleemuddin
author_facet Shah, Luqman
Nadeem, Muhammad Shahid
Khan, Jalaluddin Azam
Zeyadi, Mustafa A.
Zamzami, Mazin A.
Mohammed, Kaleemuddin
author_sort Shah, Luqman
collection PubMed
description Glutaminase (GLS) is an enzyme essential for amino acid metabolism; in particular, it acts as a catalyst in glutaminolysis, a reaction exploited by the malignant cells to meet the nutrient requirements for their accelerated growth and proliferation. Via regulating the initial reaction of the glutaminolysis pathway, glutaminase offers an intriguing target for the development of anticancer drugs. In the present study, we produced a recombinant glutaminase from Geobacillus thermodenitrificans DSM-465 in E. coli. The enzyme was purified to electrophoretic homogeneity, with 40% recovery and 22.36 fold purity. It exhibited a molecular weight of 33 kDa, with an optimum pH and temperature of 9 and 70 °C, respectively. The K(M) value of the purified enzyme was 104 μM for l-glutamine. A 3D model was built for the enzyme using Swiss-Model and subjected to molecular docking with the substrate and potential inhibitors. Moreover, the subject enzyme was compared with the human kidney type GLS-K by ConSurf and TM-align servers for evolutionary conserved residues and structural domains. Despite having less than 40% amino acid identity, the superimposed monomers of both enzymes exhibited ∼94% structural identity. With a positional difference, the active site residues Ser65, Asn117, Glu162, Asn169, Tyr193, Tyr245, and Val263 found in the bacterial enzyme were also conserved in the human GLS-K. Molecular docking results have shown that CB-839 is the best inhibitor for GLS-GT and UPGL00004 is the best inhibitor for GLS-K, as designated by the binding free energy changes, i.e. ΔG −388.7 kJ mol(−1) and ΔG −375 kJ mol(−1), respectively. Moreover, six potential inhibitory molecules were ranked according to their binding free energy change values for both enzymes. The information can be used for the in vivo anticancer studies.
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spelling pubmed-90605422022-05-04 Recombinant l-glutaminase obtained from Geobacillus thermodenitrificans DSM-465: characterization and in silico elucidation of conserved structural domains Shah, Luqman Nadeem, Muhammad Shahid Khan, Jalaluddin Azam Zeyadi, Mustafa A. Zamzami, Mazin A. Mohammed, Kaleemuddin RSC Adv Chemistry Glutaminase (GLS) is an enzyme essential for amino acid metabolism; in particular, it acts as a catalyst in glutaminolysis, a reaction exploited by the malignant cells to meet the nutrient requirements for their accelerated growth and proliferation. Via regulating the initial reaction of the glutaminolysis pathway, glutaminase offers an intriguing target for the development of anticancer drugs. In the present study, we produced a recombinant glutaminase from Geobacillus thermodenitrificans DSM-465 in E. coli. The enzyme was purified to electrophoretic homogeneity, with 40% recovery and 22.36 fold purity. It exhibited a molecular weight of 33 kDa, with an optimum pH and temperature of 9 and 70 °C, respectively. The K(M) value of the purified enzyme was 104 μM for l-glutamine. A 3D model was built for the enzyme using Swiss-Model and subjected to molecular docking with the substrate and potential inhibitors. Moreover, the subject enzyme was compared with the human kidney type GLS-K by ConSurf and TM-align servers for evolutionary conserved residues and structural domains. Despite having less than 40% amino acid identity, the superimposed monomers of both enzymes exhibited ∼94% structural identity. With a positional difference, the active site residues Ser65, Asn117, Glu162, Asn169, Tyr193, Tyr245, and Val263 found in the bacterial enzyme were also conserved in the human GLS-K. Molecular docking results have shown that CB-839 is the best inhibitor for GLS-GT and UPGL00004 is the best inhibitor for GLS-K, as designated by the binding free energy changes, i.e. ΔG −388.7 kJ mol(−1) and ΔG −375 kJ mol(−1), respectively. Moreover, six potential inhibitory molecules were ranked according to their binding free energy change values for both enzymes. The information can be used for the in vivo anticancer studies. The Royal Society of Chemistry 2019-02-01 /pmc/articles/PMC9060542/ /pubmed/35520186 http://dx.doi.org/10.1039/c8ra04740e Text en This journal is © The Royal Society of Chemistry https://creativecommons.org/licenses/by/3.0/
spellingShingle Chemistry
Shah, Luqman
Nadeem, Muhammad Shahid
Khan, Jalaluddin Azam
Zeyadi, Mustafa A.
Zamzami, Mazin A.
Mohammed, Kaleemuddin
Recombinant l-glutaminase obtained from Geobacillus thermodenitrificans DSM-465: characterization and in silico elucidation of conserved structural domains
title Recombinant l-glutaminase obtained from Geobacillus thermodenitrificans DSM-465: characterization and in silico elucidation of conserved structural domains
title_full Recombinant l-glutaminase obtained from Geobacillus thermodenitrificans DSM-465: characterization and in silico elucidation of conserved structural domains
title_fullStr Recombinant l-glutaminase obtained from Geobacillus thermodenitrificans DSM-465: characterization and in silico elucidation of conserved structural domains
title_full_unstemmed Recombinant l-glutaminase obtained from Geobacillus thermodenitrificans DSM-465: characterization and in silico elucidation of conserved structural domains
title_short Recombinant l-glutaminase obtained from Geobacillus thermodenitrificans DSM-465: characterization and in silico elucidation of conserved structural domains
title_sort recombinant l-glutaminase obtained from geobacillus thermodenitrificans dsm-465: characterization and in silico elucidation of conserved structural domains
topic Chemistry
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9060542/
https://www.ncbi.nlm.nih.gov/pubmed/35520186
http://dx.doi.org/10.1039/c8ra04740e
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