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Rodríguez-García Á, Mares RE, Muñoz PLA, Meléndez-López SG, Licea-Navarro AF, Ramos MA. DNA Extraction with DNAzol and LAMP, Performed in a Heating Block as a Simple Procedure for Detection of Mycobacterium tuberculosis in Sputum Specimens. Methods Protoc 2018; 1:E37. [PMID: 31164577 PMCID: PMC6481065 DOI: 10.3390/mps1040037] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2018] [Revised: 10/16/2018] [Accepted: 10/19/2018] [Indexed: 12/03/2022] Open
Abstract
Tuberculosis (TB) remains as a major public health issue in developing countries. Accurate detection is essential for the proper management of patients with active disease. Here, we present a simple DNAzol-LAMP (loop-mediated isothermal amplification) procedure for the detection of Mycobacterium tuberculosis in sputum specimens. Twenty smear-positive sputum samples were analyzed as follows: (i) Genetic material was extracted by a standard DNAzol protocol, and (ii) mycobacterial DNA was detected by a typical TB-specific loop-mediated isothermal amplification method. Results and diagnostic test performance attests to the suitability of the proposed procedure.
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Affiliation(s)
- Álvaro Rodríguez-García
- Facultad de Ciencias Químicas e Ingeniería, Universidad Autónoma de Baja California, Calzada Universidad 14418, Tijuana, BCN 22390, Mexico.
- Laboratorio de Diagnóstico Clínico, Hospital General de Tijuana, Vía de la Juventud Oriente 4910, Tijuana, BCN 22010, Mexico.
| | - Rosa E Mares
- Facultad de Ciencias Químicas e Ingeniería, Universidad Autónoma de Baja California, Calzada Universidad 14418, Tijuana, BCN 22390, Mexico.
| | - Patricia L A Muñoz
- Facultad de Ciencias Químicas e Ingeniería, Universidad Autónoma de Baja California, Calzada Universidad 14418, Tijuana, BCN 22390, Mexico.
| | - Samuel G Meléndez-López
- Facultad de Ciencias Químicas e Ingeniería, Universidad Autónoma de Baja California, Calzada Universidad 14418, Tijuana, BCN 22390, Mexico.
| | - Alexei F Licea-Navarro
- Departamento de Innovación Biomédica, Centro de Investigación Científica y Educación Superior de Ensenada, Carretera Ensenada-Tijuana 3918, Ensenada, BCN 22860, Mexico.
| | - Marco A Ramos
- Facultad de Ciencias Químicas e Ingeniería, Universidad Autónoma de Baja California, Calzada Universidad 14418, Tijuana, BCN 22390, Mexico.
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Millán-Gómez D, Dueñas S, Muñoz PLA, Camacho-Villegas T, Elosua C, Cabanillas-Bernal O, Escalante T, Perona A, Abia D, Drescher F, Fournier PGJ, Ramos MA, Mares RE, Paniagua-Solis J, Mata-Gonzalez T, Gonzalez-Canudas J, Hoffman RM, Licea-Navarro A, Sánchez-Campos N. In silico-designed mutations increase variable new-antigen receptor single-domain antibodies for VEGF 165 neutralization. Oncotarget 2018; 9:28016-28029. [PMID: 29963259 PMCID: PMC6021326 DOI: 10.18632/oncotarget.25549] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2017] [Accepted: 05/14/2018] [Indexed: 12/16/2022] Open
Abstract
The stability, binding, and tissue penetration of variable new-antigen receptor (VNAR) single-domain antibodies have been tested as part of an investigation into their ability to serve as novel therapeutics. V13 is a VNAR that recognizes vascular endothelial growth factor 165 (VEGF165). In the present study V13 was used as a parental molecule into which we introduced mutations designed in silico. Two of the designed VNAR mutants were expressed, and their ability to recognize VEGF165 was assessed in vitro and in vivo. One mutation (Pro98Tyr) was designed to increase VEGF165 recognition, while the other (Arg97Ala) was designed to inhibit VEGF165 binding. Compared to parental V13, the Pro98Tyr mutant showed enhanced VEGF165 recognition and neutralization, as indicated by inhibition of angiogenesis and tumor growth. This molecule thus appears to have therapeutic potential for neutralizing VEGF165 in cancer treatment.
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Affiliation(s)
- Dalia Millán-Gómez
- Departamento de Innovación Biomédica, Centro de Investigación Científica y de Educación Superior de Ensenada (CICESE), Ensenada, Baja California, México
| | - Salvador Dueñas
- Departamento de Innovación Biomédica, Centro de Investigación Científica y de Educación Superior de Ensenada (CICESE), Ensenada, Baja California, México
| | - Patricia L A Muñoz
- Facultad de Ciencias Químicas e Ingeniería, Universidad Autónoma de Baja California, Tijuana, Baja California, México
| | - Tanya Camacho-Villegas
- CONACYT- Unidad de Biotecnología Médica y Farmacéutica, Centro de Investigación y Asistencia en Tecnología y Diseño Del Estado de Jalisco (CIATEJ), Guadalajara, Jalisco, México
| | - Carolina Elosua
- Teraclon IDF, Parque Científico de Madrid, Tres Cantos, Madrid, Spain
| | - Olivia Cabanillas-Bernal
- Departamento de Innovación Biomédica, Centro de Investigación Científica y de Educación Superior de Ensenada (CICESE), Ensenada, Baja California, México
| | - Teresa Escalante
- Instituto Clodomiro Picado, Facultad de Microbiología, Universidad de Costa Rica, San José, Costa Rica
| | - Almudena Perona
- Grupo de Biotecnología Aplicada, Universidad Europea de Madrid, Madrid, Spain
| | - David Abia
- Grupo de Biotecnología Aplicada, Universidad Europea de Madrid, Madrid, Spain
| | - Florian Drescher
- Departamento de Innovación Biomédica, Centro de Investigación Científica y de Educación Superior de Ensenada (CICESE), Ensenada, Baja California, México
| | - Pierrick G J Fournier
- Departamento de Innovación Biomédica, Centro de Investigación Científica y de Educación Superior de Ensenada (CICESE), Ensenada, Baja California, México
| | - Marco A Ramos
- Facultad de Ciencias Químicas e Ingeniería, Universidad Autónoma de Baja California, Tijuana, Baja California, México
| | - Rosa E Mares
- Facultad de Ciencias Químicas e Ingeniería, Universidad Autónoma de Baja California, Tijuana, Baja California, México
| | | | | | | | - Robert M Hoffman
- AntiCancer Inc., San Diego, CA, USA.,Department of Surgery, University of California, San Diego, CA, USA
| | - Alexei Licea-Navarro
- Departamento de Innovación Biomédica, Centro de Investigación Científica y de Educación Superior de Ensenada (CICESE), Ensenada, Baja California, México
| | - Noemí Sánchez-Campos
- Departamento de Innovación Biomédica, Centro de Investigación Científica y de Educación Superior de Ensenada (CICESE), Ensenada, Baja California, México
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Jalomo-Khayrova E, Mares RE, Muñoz PLA, Meléndez-López SG, Rivero IA, Ramos MA. Soluble expression of an amebic cysteine protease in the cytoplasm of Escherichia coli SHuffle Express cells and purification of active enzyme. BMC Biotechnol 2018; 18:20. [PMID: 29615011 PMCID: PMC5883314 DOI: 10.1186/s12896-018-0429-y] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2017] [Accepted: 03/15/2018] [Indexed: 12/21/2022] Open
Abstract
Background Recombinant production of amebic cysteine proteases using Escherichia coli cells as the bacterial system has become a challenging effort, with protein insolubility being the most common issue. Since many of these enzymes need a native conformation stabilized by disulfide bonds, an elaborate process of oxidative folding is usually demanded to get a functional protein. The cytoplasm of E. coli SHuffle Express cells owns an enhanced ability to properly fold proteins with disulfide bonds. Because of this cellular feature, it was possible to assume that this strain represents a reliable expression system and worthwhile been considered as an efficient bacterial host for the recombinant production of amebic cysteine proteases. Results Using E. coli SHuffle Express cells as the bacterial system, we efficiently produce soluble recombinant EhCP1protein. Enzymatic and inhibition analyses revealed that it exhibits proper catalytic abilities, proceeds effectively over the substrate (following an apparent Michaelis-Menten kinetics), and displays a typical inhibition profile. Conclusions We report the first feasibility study of the recombinant production of amebic cysteine proteases using E. coli SHuffle Express as the bacterial host. We present a simple protocol for the recombinant expression and purification of fully soluble and active EhCP1 enzyme. We confirm the suitability of recombinant EhCP1 as a therapeutic target. We propose an approachable bacterial system for the recombinant production of amebic proteins, particularly for those with a need for proper oxidative folding. Electronic supplementary material The online version of this article (10.1186/s12896-018-0429-y) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Ekaterina Jalomo-Khayrova
- Facultad de Ciencias Químicas e Ingeniería, Universidad Autónoma de Baja California, Calzada Universidad 14418, Parque Industrial Internacional, 22390, Tijuana, BCN, México
| | - Rosa E Mares
- Facultad de Ciencias Químicas e Ingeniería, Universidad Autónoma de Baja California, Calzada Universidad 14418, Parque Industrial Internacional, 22390, Tijuana, BCN, México
| | - Patricia L A Muñoz
- Facultad de Ciencias Químicas e Ingeniería, Universidad Autónoma de Baja California, Calzada Universidad 14418, Parque Industrial Internacional, 22390, Tijuana, BCN, México
| | - Samuel G Meléndez-López
- Facultad de Ciencias Químicas e Ingeniería, Universidad Autónoma de Baja California, Calzada Universidad 14418, Parque Industrial Internacional, 22390, Tijuana, BCN, México
| | - Ignacio A Rivero
- Centro de Graduados e Investigación en Química, Instituto Tecnológico de Tijuana, Boulevard Industrial S/N, Mesa de Otay, 22510, Tijuana, BCN, México
| | - Marco A Ramos
- Facultad de Ciencias Químicas e Ingeniería, Universidad Autónoma de Baja California, Calzada Universidad 14418, Parque Industrial Internacional, 22390, Tijuana, BCN, México.
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Muñoz PLA, Minchaca AZ, Mares RE, Ramos MA. Activity, stability and folding analysis of the chitinase from Entamoeba histolytica. Parasitol Int 2015; 65:70-77. [PMID: 26526675 DOI: 10.1016/j.parint.2015.10.006] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2015] [Revised: 09/11/2015] [Accepted: 10/20/2015] [Indexed: 10/22/2022]
Abstract
Human amebiasis, caused by the parasitic protozoan Entamoeba histolytica, remains as a significant public health issue in developing countries. The life cycle of the parasite compromises two main stages, trophozoite and cyst, linked by two major events: encystation and excystation. Interestingly, the cyst stage has a chitin wall that helps the parasite to withstand harsh environmental conditions. Since the amebic chitinase, EhCHT1, has been recognized as a key player in both encystation and excystation, it is plausible to consider that specific inhibition could arrest the life cycle of the parasite and, thus, stop the infection. However, to selectively target EhCHT1 it is important to recognize its unique biochemical features to have the ability to control its cellular function. Hence, to gain further insights into the structure-function relationship, we conducted an experimental approach to examine the effects of pH, temperature, and denaturant concentration on the enzymatic activity and protein stability. Additionally, dependence on in vivo oxidative folding was further studied using a bacterial model. Our results attest the potential of EhCHT1 as a target for the design and development of new or improved anti-amebic therapeutics. Likewise, the potential of the oxidoreductase EhPDI, involved in oxidative folding of amebic proteins, was also confirmed.
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Affiliation(s)
- Patricia L A Muñoz
- Facultad de Ciencias Químicas e Ingeniería, Universidad Autónoma de Baja California, Calzada Universidad 14418, Parque Industrial Internacional, Tijuana, B.C. 22390, Mexico
| | - Alexis Z Minchaca
- Facultad de Ciencias Químicas e Ingeniería, Universidad Autónoma de Baja California, Calzada Universidad 14418, Parque Industrial Internacional, Tijuana, B.C. 22390, Mexico
| | - Rosa E Mares
- Facultad de Ciencias Químicas e Ingeniería, Universidad Autónoma de Baja California, Calzada Universidad 14418, Parque Industrial Internacional, Tijuana, B.C. 22390, Mexico
| | - Marco A Ramos
- Facultad de Ciencias Químicas e Ingeniería, Universidad Autónoma de Baja California, Calzada Universidad 14418, Parque Industrial Internacional, Tijuana, B.C. 22390, Mexico.
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