Predicción de la propensión de péptidos a formar agregados tipo amiloide mediante cálculos de estructura electrónica

dc.contributor.advisorAlí Torres, Jorge Isaacspa
dc.contributor.authorEspín Delgado, Luisa Fernandaspa
dc.contributor.researchgroupQuímica Cuántica y Computacionalspa
dc.date.accessioned2021-10-12T16:56:29Z
dc.date.available2021-10-12T16:56:29Z
dc.date.issued2021-02-17
dc.descriptionilustraciones, gráficas, tablasspa
dc.description.abstractLa acumulación de agregados de péptidos y proteínas es una de las marcas patológicas de alrededor de 50 enfermedades. Estudios experimentales revelan una relación de dependencia entre la secuencia de aminoácidos de una proteína y el proceso de formación de agregados, además de la existencia de regiones específicas que son más propensas a agregarse que otras. En este trabajo, se estudió el proceso de agregación de péptidos considerando que es posible predecir su tendencia intrínseca a agregarse en función de la energía de interacción entre dos unidades peptídicas. Se propuso que esta energía de interacción puede aproximarse como la suma de interacciones individuales de los pares de aminoácidos que componen los pépti dos. La energía de interacción entre pares de aminoácidos se obtuvo mediante cálculos de estructura electrónica bajo el esquema ONIOM (DFT/AM1). La energía de interacción se separó en dos contribuciones: la energía de distorsión de la cadena principal y la energía de interacción de la cadena lateral. Los resultados muestran que estas contribuciones se relacionan con características químicas y estructurales de los aminoácidos. La aproximación propuesta permite estimar energías de interacción de hexapéptidos de manera rápida y con un error de 0.76 kcal/mol por aminoácido en comparación con cálculos a nivel DFT. Con estos resultados se diseñó una herramienta que permite estimar la energía de interacción de dos hexapéptidos con un bajo costo computacional comparado con cálculos en DFT. (Texto tomado de la fuente).spa
dc.description.abstractProtein aggregation is one of the pathological hallmarks of about 50 diseases. Experimental studies have shown a relationship between the amino acid sequence and the aggregation pro cess, in addition to the existence of specific regions more prone to aggregate than others. In this work, peptide aggregation process was studied by considering that the intrinsic aggrega tion propensity can be predicted as a function of the interaction energy between two peptide units. An approach was proposed in which the interaction energy is expressed as the sum of amino acid pair interactions comprising the hexapeptides. For this purpose, electronic structure calculations were carried out using ONIOM (DFT/AM1) scheme. The interaction energy was separated into two contributions: the peptide backbone distortion energy and the side chain interaction energy. Results revealed that the interaction energy is related to chemical and structural features of amino acids. The approach enables estimating hexapep tide interaction energies with an error of 0.76 kcal/mol per amino acid compared with DFT calculations. These results were consequently used to design a computational tool that cal culates hexapeptide interaction energies with a low computational cost compared to DFT calculations.eng
dc.description.degreelevelMaestríaspa
dc.description.degreenameMagíster en Ciencias - Químicaspa
dc.description.notesIncluye anexosspa
dc.description.researchareaQuímica computacionalspa
dc.format.extentxii, 70 páginasspa
dc.format.mimetypeapplication/pdfspa
dc.identifier.instnameUniversidad Nacional de Colombiaspa
dc.identifier.reponameRepositorio Institucional Universidad Nacional de Colombiaspa
dc.identifier.repourlhttps://repositorio.unal.edu.co/spa
dc.identifier.urihttps://repositorio.unal.edu.co/handle/unal/80514
dc.language.isospaspa
dc.publisherUniversidad Nacional de Colombiaspa
dc.publisher.branchUniversidad Nacional de Colombia - Sede Bogotáspa
dc.publisher.departmentDepartamento de Químicaspa
dc.publisher.facultyFacultad de Cienciasspa
dc.publisher.placeBogotá, Colombiaspa
dc.publisher.programBogotá - Ciencias - Maestría en Ciencias - Químicaspa
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dc.rights.accessrightsinfo:eu-repo/semantics/openAccessspa
dc.rights.licenseAtribución-CompartirIgual 4.0 Internacionalspa
dc.rights.urihttp://creativecommons.org/licenses/by-sa/4.0/spa
dc.subject.ddc540 - Química y ciencias afines::541 - Química físicaspa
dc.subject.lembPeptideseng
dc.subject.lembPéptidosspa
dc.subject.lembAmyloideng
dc.subject.lembAmiloideospa
dc.subject.lembQuantum chemistryeng
dc.subject.lembQuímica cuánticaspa
dc.subject.proposalProceso de agregaciónspa
dc.subject.proposalONIOMspa
dc.subject.proposalDFTspa
dc.subject.proposalQuímica computacionalspa
dc.subject.proposalAggregation processeng
dc.subject.proposalAggregation propensityeng
dc.subject.proposalComputational chemistryeng
dc.subject.proposalFibras amiloidespa
dc.subject.proposalPropensión a la agregaciónspa
dc.subject.proposalAmyloid fibrilseng
dc.titlePredicción de la propensión de péptidos a formar agregados tipo amiloide mediante cálculos de estructura electrónicaspa
dc.title.translatedPrediction of the propensity of peptides to form amyloid-like aggregates by means of electronic structure calculationseng
dc.typeTrabajo de grado - Maestríaspa
dc.type.coarhttp://purl.org/coar/resource_type/c_bdccspa
dc.type.coarversionhttp://purl.org/coar/version/c_ab4af688f83e57aaspa
dc.type.contentTextspa
dc.type.driverinfo:eu-repo/semantics/masterThesisspa
dc.type.redcolhttp://purl.org/redcol/resource_type/TMspa
dc.type.versioninfo:eu-repo/semantics/acceptedVersionspa
dcterms.audience.professionaldevelopmentPúblico generalspa
oaire.accessrightshttp://purl.org/coar/access_right/c_abf2spa

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