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1.
Biomedica ; 27(1): 7-20, 2007 Mar.
Artigo em Espanhol | MEDLINE | ID: mdl-17546220

RESUMO

INTRODUCTION: Hunter syndrome (MC KUSIK 309900) or mucopolysacharidosis type II is due to the deficiency of the enzyme iduronate 2 sulfate sulfatase (E.C. 3.1.6.13). This enzyme has not been crystallized, and therefore the experimental structures are not available. OBJECTIVES: A computational three-dimensional model was proposed for the iduronate 2 sulfate sulfatase enzyme. MATERIALS AND METHODS: A computational analysis of this enzyme used the following free internet software programs: Comput pI/MW, JaMBW Chapter 3.1.7, SWISS-MODEL, Geno3d, ProSup. Energy minimization was done with Discover 3 and Insight II version 2004. RESULTS: A three-dimensional conformational model was proposed. The model showed 33.3% of helix structure, 7.2% beta sheet, and 59.5% random coil. RMS values (Root Mean Square) (0.78 and 0.86A) were found when compared with other enzymes of the same family. The model presented 5 exposed N-glycosylation potential sites and an entry to the pocket that contains the amino acids of the active site. A high correlation was found between the type of mutations and the severity of the phenotype in twenty patients analyzed. CONCLUSION: The RMS values, as well as the high correlation between the type of mutation and the phenotype, indicated that the model predicts some aspects of the enzymes biological behavior.


Assuntos
Simulação por Computador , Iduronato Sulfatase , Modelos Teóricos , Humanos , Estrutura Terciária de Proteína
2.
Univ. med ; 45(1): 7-12, ene.-mar. 2004. ilus, tab
Artigo em Espanhol | LILACS | ID: lil-501119

RESUMO

La técnica de RAPD permite amplificar el ADN cromosómico, mediante el uso de iniciadores arbitrarios. El objetivo del presente trabajo fue el de establecer, mediante el uso de RAPD, el grado de polimorfismo en cepas de Escherichia coli enteropatógena (ECEP) aisladas en Bogotá (Colombia). En el estudio se incluyeron 17 serotipos de ECEP distribuidas de la siguiente manera: 41,2% de O126:K71; 23,5% de O111:K59; 23,5% de O55:K59 y 11,8% de O127:K63. En la amplificación del ADN, se utilizó el iniciador OPA-07. La distancia genética entre estos patrones de RAPD generó entre 3 y 13 bandas de ADN con tamaños moleculares que variaron entre los 0,5 y los 6,1 kb. Las cepas estudiadas se pudieron agrupar en 17 patrones de RAPD diferentes y se encontraron distancias proporcionales entre 0,13 y 0,58. Los resultados del análisis de RAPD permiten concluir que, al menos, una única línea clonal de cada uno de los serotipos estudiados estuvo circulando en los hospitales estudiados.


Assuntos
Humanos , Diarreia , Escherichia coli , Pacientes
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