ESTUDIOS ESTRUCTURALES DE LA PARTICULA SUBVIRAL DE HEPATITIS C Y SUS COMPLEJOS C...
ESTUDIOS ESTRUCTURALES DE LA PARTICULA SUBVIRAL DE HEPATITIS C Y SUS COMPLEJOS CON EL RECEPTOR HUMANO CD81
FLAVIVIRUSES FAMILY INCLUDES SOME OF THE MOST IMPORTANT HUMAN PATHOGENS SUCH AS WEST NILE, YELLOW FEVER, TICK-BORNE ENCEPHALITIS (TBE), DENGUE AND HEPATITIS C VIRUSES, MOST OF THESE VIRUSES ARE TRANSMITTED TO HUMAN THROUGH MOSQUIT...
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el día 2009-01-01
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Descripción del proyecto
FLAVIVIRUSES FAMILY INCLUDES SOME OF THE MOST IMPORTANT HUMAN PATHOGENS SUCH AS WEST NILE, YELLOW FEVER, TICK-BORNE ENCEPHALITIS (TBE), DENGUE AND HEPATITIS C VIRUSES, MOST OF THESE VIRUSES ARE TRANSMITTED TO HUMAN THROUGH MOSQUITOES¿ BITE WHILST HEPATITIS C IS SPREAD PRIMARILY BY DIRECT CONTACT WITH HUMAN BLOOD, IN THE PARTICULAR CASE OF HEPATITIS C ALMOST 170 MILLION OF PEOPLE ARE INFECTED PER YEAR (WHO), CURRENTLY THERE IS NO VACCINE AGAINST HEPATITIS C VIRUS AND VERY LITTLE IS KNOWN ABOUT ITS TRIDIMENSIONAL STRUCTURE AND THE STRUCTURES OF ITS ENVELOPE PROTEINS, THE ONLY INFORMATION AVAILABLE IS A CRYO-ELECTRON MICROSCOPY RECONSTRUCTION OF NAKED HEPATITIS C VIRUS-LIKE PARTICLES AT 30A RESOLUTION OFFERING VERY LITTLE INSIGHTS INTO ASSEMBLY MECHANISM OR VIRUS-CELL ATTACHMENT, OUR PROPOSAL AIMS TO EXTEND FURTHER THE STRUCTURAL KNOWLEDGE ON HEPATITIS C VIRUS-LIKE PARTICLES AND ITS COMPLEX WITH THE HUMAN RECEPTOR CD81 BY PROVIDING THREE DIMENSIONAL MAPS OBTAINED INITIALLY BY ELECTRON TOMOGRAPHY AND THEN BY ELECTRON MICROSCOPY, CRYO-TOMOGRAPHY WILL ENABLE US TO CHARACTERIZE THE ARCHITECTURE OF INDIVIDUAL HCV-CD81 COMPLEX USING EITHER FULL-LENGTH OR SHORT CD81 (LEL DOMAIN) INSERTED INTO LIPOSOMES, THE RESOLUTION OF THE TOMOGRAPHIC RECONSTRUCTION WILL INFORM US ON THE GEOMETRY OF VIRUS ATTACHMENT ONTO THE CD81 LIPOSOME, A SIMPLIFIED MIMICRY OF THE CELLULAR CONTEXT, THE VIRUS-LIKE PARTICLES WILL BE ALSO ANALYSED IN PRESENCE OF HIGH AND LOW PH BUFFER IN ORDER TO DISPLAY THE CONFORMATIONAL CHANGES OF THE ENVELOPE PROTEINS IN THE VIRUS CONTEXT, IN ADDITION THE CURRENT RESEARCH PROPOSAL INCLUDES THE STRUCTURAL CHARACTERIZATION OF HCV VIRUS-LIKE PARTICLES AND CD81-LEL DOMAIN COMPLEX BY CRYO-ELECTRON MICROSCOPY, THE OUTCOME THREE-DIMENSIONAL MAPS WILL BE USED TO INFER WITH THE CURRENT BIOCHEMICAL KNOWLEDGE ON E1 AND E2 AND THEIR STRUCTURAL HOMOLOGY WITH OTHER FLAVIVIRADAE ENVELOPE PROTEINS AND THE ATOMIC MODEL OF THE ISOLATED LEL DOMAIN THE MOLECULAR BASIS OF THE VIRUS-RECEPTOR INTERACTION,THE ANALYSIS RESULTING FROM THE COMBINATION OF TOMOGRAPHY AND ELECTRON MICROSCOPY WILL DEPICT BOTH A DYNAMIC AND STATIC PICTURE OF THE VIRUS-HOST ATTACHMENT, HEPATITIS C VIRUS-LIKE-PARTICLES\TOMOGRAPHY\CRYO-ELECTRON MICROSCOPY\VIRUS RECEPTOR\VIRUS ATTACHMENT