Análisis estructural y determinación de la actividad tóxica de las mutantes 8cry11l553f, 8cry11l556w, y 8cry11l553f-l556w obtenidas por mutagénesis sitio dirigida en larvas de primer estadio de aedes aegypti.

92 p.

Autores:
Herrera Pineda, Diego Fernando
Tipo de recurso:
Trabajo de grado de pregrado
Fecha de publicación:
2018
Institución:
Universidad de Santander
Repositorio:
Repositorio Universidad de Santander
Idioma:
spa
OAI Identifier:
oai:repositorio.udes.edu.co:001/4342
Acceso en línea:
https://repositorio.udes.edu.co/handle/001/4342
Palabra clave:
Bacillus thuringiensis
Proteínas Cry
Mutagénesis sitio dirigida
SDS-PAGE
Concentración letal media
Cry proteins
Site-directed mutagénesis
Half- lethal concentration
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openAccess
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oai_identifier_str oai:repositorio.udes.edu.co:001/4342
network_acronym_str RUDES2
network_name_str Repositorio Universidad de Santander
repository_id_str
dc.title.spa.fl_str_mv Análisis estructural y determinación de la actividad tóxica de las mutantes 8cry11l553f, 8cry11l556w, y 8cry11l553f-l556w obtenidas por mutagénesis sitio dirigida en larvas de primer estadio de aedes aegypti.
title Análisis estructural y determinación de la actividad tóxica de las mutantes 8cry11l553f, 8cry11l556w, y 8cry11l553f-l556w obtenidas por mutagénesis sitio dirigida en larvas de primer estadio de aedes aegypti.
spellingShingle Análisis estructural y determinación de la actividad tóxica de las mutantes 8cry11l553f, 8cry11l556w, y 8cry11l553f-l556w obtenidas por mutagénesis sitio dirigida en larvas de primer estadio de aedes aegypti.
Bacillus thuringiensis
Proteínas Cry
Mutagénesis sitio dirigida
SDS-PAGE
Concentración letal media
Cry proteins
Site-directed mutagénesis
Half- lethal concentration
title_short Análisis estructural y determinación de la actividad tóxica de las mutantes 8cry11l553f, 8cry11l556w, y 8cry11l553f-l556w obtenidas por mutagénesis sitio dirigida en larvas de primer estadio de aedes aegypti.
title_full Análisis estructural y determinación de la actividad tóxica de las mutantes 8cry11l553f, 8cry11l556w, y 8cry11l553f-l556w obtenidas por mutagénesis sitio dirigida en larvas de primer estadio de aedes aegypti.
title_fullStr Análisis estructural y determinación de la actividad tóxica de las mutantes 8cry11l553f, 8cry11l556w, y 8cry11l553f-l556w obtenidas por mutagénesis sitio dirigida en larvas de primer estadio de aedes aegypti.
title_full_unstemmed Análisis estructural y determinación de la actividad tóxica de las mutantes 8cry11l553f, 8cry11l556w, y 8cry11l553f-l556w obtenidas por mutagénesis sitio dirigida en larvas de primer estadio de aedes aegypti.
title_sort Análisis estructural y determinación de la actividad tóxica de las mutantes 8cry11l553f, 8cry11l556w, y 8cry11l553f-l556w obtenidas por mutagénesis sitio dirigida en larvas de primer estadio de aedes aegypti.
dc.creator.fl_str_mv Herrera Pineda, Diego Fernando
dc.contributor.advisor.spa.fl_str_mv Suárez Barrera, Miguel Orlando
dc.contributor.author.spa.fl_str_mv Herrera Pineda, Diego Fernando
dc.contributor.educationalvalidator.spa.fl_str_mv Rueda Forero, Nohora Juliana
dc.subject.proposal.spa.fl_str_mv Bacillus thuringiensis
Proteínas Cry
Mutagénesis sitio dirigida
SDS-PAGE
Concentración letal media
Cry proteins
Site-directed mutagénesis
Half- lethal concentration
topic Bacillus thuringiensis
Proteínas Cry
Mutagénesis sitio dirigida
SDS-PAGE
Concentración letal media
Cry proteins
Site-directed mutagénesis
Half- lethal concentration
description 92 p.
publishDate 2018
dc.date.issued.spa.fl_str_mv 2018-11-23
dc.date.accessioned.spa.fl_str_mv 2020-01-21T21:10:20Z
dc.date.available.spa.fl_str_mv 2020-01-21T21:10:20Z
dc.type.spa.fl_str_mv Trabajo de grado - Pregrado
dc.type.coar.spa.fl_str_mv http://purl.org/coar/resource_type/c_7a1f
dc.type.content.spa.fl_str_mv Text
dc.type.driver.spa.fl_str_mv info:eu-repo/semantics/bachelorThesis
dc.type.redcol.spa.fl_str_mv https://purl.org/redcol/resource_type/TP
dc.type.version.spa.fl_str_mv info:eu-repo/semantics/acceptedVersion
format http://purl.org/coar/resource_type/c_7a1f
status_str acceptedVersion
dc.identifier.local.spa.fl_str_mv T 33.18 H277a
dc.identifier.uri.spa.fl_str_mv https://repositorio.udes.edu.co/handle/001/4342
identifier_str_mv T 33.18 H277a
url https://repositorio.udes.edu.co/handle/001/4342
dc.language.iso.spa.fl_str_mv spa
language spa
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spelling Suárez Barrera, Miguel Orlando99b4d9f0-b967-4877-9973-dbb3381a16ff-1Herrera Pineda, Diego Fernandof0ae1de8-3219-4e67-bedc-bba83bcc9d2b-1Rueda Forero, Nohora Juliana2020-01-21T21:10:20Z2020-01-21T21:10:20Z2018-11-2392 p.Bacillus thuringiensis is a Gram-positive bacterium, δ-endotoxins producer that are toxic to different orders of insects and nematodes. Cry11 is a specific toxin against the vector A. aegypti, which is responsible for the transmission of dengue, zika and chikungunya; however, its mode of action and structure-function characteristics have not yet been fully elucidated. The research group of Molecular Biology and Biotechnology of the UDES, has a library obtained by shuffling the DNA of cry11 genes, highlighting the variant 8Cry11, which is 6 times more toxic than Cry11Aa and 3.8 more than Cry11Bb. Molecular Docking studies showed that positions 553 and 556 of this protein are relevant in the interaction with the cadherin receptor, to corroborate this information, site-directed mutagenesis was performed to reverse the aforementioned mutations, obtaining the variants 8Cry11L553F, 8Cry11L556W, and 8Cry11L553F-L556W. In this work, the toxic activity of mutants 8Cry11L553F, 8Cry11L556W, and 8Cry11L553F-L556W was determined, as well as an approximation of protein analysis both in silico and in vitro through SDS-PAGE. To achieve this, the ideal conditions for the production of δ-endotoxin (Cry11Aa) were standardized, finding a relationship between glucose concentrations (15g / L) and sources of organic and inorganic nitrogen in a ratio of 3: 7; the production of protoxin (~ 100 kDa) and toxin (32 and 34 kDa) was corroborated by SDS page. To determine the mean lethal concentration in comparison with the mutant 8Cry11 and the parental Cry11Aa, the toxicity of the mutants was evaluated, against first stage larvae of A. aegypti. The results showed loss of toxicity for the variants under study, which indicated that substituted amino acids in domain III were strongly possible involved in the loss of toxicity due to structural features.Bacillus thuringiensis es un bacilo Gram-positivo productor de δ-endotoxinas que son tóxicas para diferentes órdenes de insectos y nematodos. Cry11 es una toxina específica contra el vector A. aegypti, el cual es el responsable de la trasmisión del dengue, zika y chikungunya; sin embargo, su modo de acción y características estructura-función aún no se han elucidado completamente. El grupo de investigación de Biología Molecular y Biotecnología de la UDES, cuenta con una librería obtenida por barajado de ADN de genes cry11, resaltando la variante 8Cry11, la cual es 6 veces más toxica que Cry11Aa y 3,8 más que Cry11Bb. Estudios de Docking molecular demostraron que las posiciones 553 y 556 de esta proteína son relevantes en la interacción con el receptor cadherina, para corroborar esta información se realizó mutagénesis sitio dirigida para revertir las mutaciones mencionadas, obteniendo las variantes 8Cry11L553F, 8Cry11L556W, y 8Cry11L553F-L556W. En este trabajo se determinó la actividad tóxica de las mutantes 8Cry11L553F, 8Cry11L556W, y 8Cry11L553F-L556W así como una aproximación de análisis de proteínas tanto in silico como in vitro a través de SDS-PAGE. Para lograrlo se estandarizó las condiciones ideales para la producción de la δ-endotoxina (Cry11Aa), encontrándose una relación entre las concentraciones de glucosa (15g/L) y las fuentes de nitrógeno orgánico e inorgánico en una proporción de 3:7; se corroboró mediante SDS page la producción de protoxina (~100 kDa) y toxina (32 y 34 kDa). Se evaluó la toxicidad de las mutantes frente a larvas en primer estadío de A. aegypti para determinar la concentración letal media en comparación con la mutante 8Cry11 y la parental Cry11Aa, los resultados mostraron pérdida de toxicidad para las variantes en estudio, lo cual indicó que aminoácidos sustituidos en el dominio III fueron los posibles involucrados en la perdida de la toxicidad debido a la características estructurales.PregradoMicrobiólogo Industrial1. INTRODUCCIÓN ........................................................................... 15 2. PLANTEAMIENTO DEL PROBLEMA ............................................ 20 3. JUSTIFICACIÓN ............................................................................ 23 4. HIPOTESIS .................................................................................... 26 4.1 Hipótesis de Investigación. .......................................................... 26 4.2 Hipótesis alternativa. ................................................................... 26 4.3 Hipótesis Nula.............................................................................. 26 5. MARCO TEORICO ......................................................................... 27 5.1 Generalidades de Bt .................................................................... 27 5.2 Proteínas Cry ............................................................................... 28 5.3 Mecanismos de acción de las toxinas Cry de Bt ......................... 35 5.4 Proteínas Cry11 ........................................................................... 40 5.5 Mejoramiento genético de proteínas ............................................ 42 6. ESTADO DEL ARTE ...................................................................... 46 7. OBJETIVOS ................................................................................... 50 7.1 OBJETIVO GENERAL ................................................................. 50 7.2 OBJETIVOS ESPECIFICOS ....................................................... 50 8. METODOLOGÍA ............................................................................. 51 8.1 Diseño del estudio: ...................................................................... 51 8.2 Metodología. ................................................................................ 51 8.2.1 Análisis de secuencias deducidas de las mutantes 8Cry11, 8Cry11L553F, 8Cry11L556W, y 8Cry11L553F-L556W respecto a la parental Cry11Aa. ............................................................................................ 52 8.2.2 Determinación de compoosciones ideales para el medio de cultivo.......................... 52 8.2.3 Cepas bacterianas y condiciones de cultivo. ............................ 53 8.2.4 Obtención de cultivos finales de las cepas bacterianas. ........... 54 8.2.5 Extracción total de proteínas. ................................................... 54 8.2.6 Cuantificación de proteínas. ..................................................... 54 8.2.7 Digestión de proteínas Cry con proteasas. ............................... 55 8.2.8 Determinación de los patrones electroforéticos. ....................... 55 8.2.9 Estimación peso seco. .............................................................. 56 8.2.10 Ensayos de letalidad. .............................................................. 56 8.2.11 Consideraciones éticas. .......................................................... 56 9. RESULTADOS ............................................................................... 58 10. DISCUSIÓN ................................................................................ 70 11. CONCLUSIONES ....................................................................... 77 12. RECOMENDACIONES ............................................................... 79 13. BIBLIOGRAFÍA ........................................................................... 80Ej. 1application/pdfT 33.18 H277ahttps://repositorio.udes.edu.co/handle/001/4342spaBucaramanga : Universidad de Santander, 2018Facultad de Ciencias Exactas, Naturales y AgropecuariasMicrobiología IndustrialAbdullah, M., & Dean, D. (2004). Enhancement of Cry19Aa mosquitocidal activity against Aedes aegypti by mutations in the putative loop regions of domain II. Appl. Environ. Microbiol, 3769-3771.Abdullah, M., Alzate, O., Mohammad, M., McNall, R., Adang, M., & Dean, D. (2003). 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Applied Biochemistry and Biotechnology, 41-52.Derechos Reservados - Universidad de Santander, 2018info:eu-repo/semantics/openAccessAtribución-NoComercial 4.0 Internacional (CC BY-NC 4.0)https://creativecommons.org/licenses/by-nc/4.0/http://purl.org/coar/access_right/c_abf2Bacillus thuringiensisProteínas CryMutagénesis sitio dirigidaSDS-PAGEConcentración letal mediaCry proteinsSite-directed mutagénesisHalf- lethal concentrationAnálisis estructural y determinación de la actividad tóxica de las mutantes 8cry11l553f, 8cry11l556w, y 8cry11l553f-l556w obtenidas por mutagénesis sitio dirigida en larvas de primer estadio de aedes aegypti.Trabajo de grado - Pregradohttp://purl.org/coar/resource_type/c_7a1fTextinfo:eu-repo/semantics/bachelorThesishttps://purl.org/redcol/resource_type/TPinfo:eu-repo/semantics/acceptedVersionPublicationORIGINALAnálisis estructural y determinación de la actividad tóxica de las mutantes 8cry11l553f, 8cry11l556w, y 8cry11l553f-l556w obtenidas por mutagénesis sitio dirigida en larvas de primer...pdfAnálisis estructural y determinación de la actividad tóxica de las mutantes 8cry11l553f, 8cry11l556w, y 8cry11l553f-l556w obtenidas por mutagénesis sitio dirigida en larvas de primer...pdfapplication/pdf1917902https://repositorio.udes.edu.co/bitstreams/4325ce8c-bd86-4b15-8ddc-7f5922e609bd/download7e8a5fcc8041ef24e4704338eeba8f27MD51LICENSElicense.txtlicense.txttext/plain; charset=utf-859https://repositorio.udes.edu.co/bitstreams/feb4a5f5-8dfd-4331-ada1-99ac7c670c6f/download38d94cf55aa1bf2dac1a736ac45c881cMD52TEXTAnálisis estructural y determinación de la actividad tóxica de las mutantes 8cry11l553f, 8cry11l556w, y 8cry11l553f-l556w obtenidas por mutagénesis sitio dirigida en larvas de primer...pdf.txtAnálisis estructural y determinación de la actividad tóxica de las mutantes 8cry11l553f, 8cry11l556w, y 8cry11l553f-l556w obtenidas por mutagénesis sitio dirigida en larvas de primer...pdf.txtExtracted texttext/plain122721https://repositorio.udes.edu.co/bitstreams/b31b3421-50a4-47e3-854f-919a35cd289f/downloaddea278946c675b0bd937e7d09080ea2eMD53THUMBNAILAnálisis estructural y determinación de la actividad tóxica de las mutantes 8cry11l553f, 8cry11l556w, y 8cry11l553f-l556w obtenidas por mutagénesis sitio dirigida en larvas de primer...pdf.jpgAnálisis estructural y determinación de la actividad tóxica de las mutantes 8cry11l553f, 8cry11l556w, y 8cry11l553f-l556w obtenidas por mutagénesis sitio dirigida en larvas de primer...pdf.jpgGenerated Thumbnailimage/jpeg1277https://repositorio.udes.edu.co/bitstreams/e8acef57-f314-459f-adcd-3bab221a3c11/download250d0621b2d873305ccf8126527d6d78MD54001/4342oai:repositorio.udes.edu.co:001/43422022-10-25 11:18:25.08https://creativecommons.org/licenses/by-nc/4.0/Derechos Reservados - Universidad de Santander, 2018https://repositorio.udes.edu.coRepositorio Universidad de Santandersoporte@metabiblioteca.comTGljZW5jaWEgZGUgUHVibGljYWNpw7NuIFVERVMKRGlyZWN0cmljZXMgZGUgVVNPIHkgQUNDRVNPCgo=