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Departament de Ciències Experimentals i de la Salut
Sobre Circe y otros mitos en
reactividad.
Extractos de bioquímica
computacional
Jordi Villà
IMIM/UPF
Departament de Ciències Experimentals i de la Salut
Comprender las enzimas
Relaciones estructura-función
Descripción de fármacos más potentes y
específicos (mutaciones)
Departament de Ciències Experimentals i de la Salut
Mecanismo Michaelis-Menten
Departament de Ciències Experimentals i de la Salut
Circe
Departament de Ciències Experimentals i de la Salut
efecto Circe: ODCasa
Departament de Ciències Experimentals i de la Salut
efecto Circe: ODCasa
Departament de Ciències Experimentals i de la Salut
ODCasa: GSD vs TSS
Departament de Ciències Experimentals i de la Salut
efecto estérico: near attack
conformations (NAC)
Bruice, 2002
Departament de Ciències Experimentals i de la Salut
Ejemplo: haloalcano deshalogenasa
Departament de Ciències Experimentals i de la Salut
Parametros
“NAC”:
Departament de Ciències Experimentals i de la Salut
potencial
EVB
0
2
1
2
2
12
1
21
1




V
H
H
H
V
H
H
H
V
n
n
n
n
n










Vg se obtiene por diagonalización del
Hamiltoniano correspondiente
Departament de Ciències Experimentals i de la Salut
agua enzima
TS RS
Departament de Ciències Experimentals i de la Salut
Departament de Ciències Experimentals i de la Salut
determinacion de DDg‡
steric: RRA
Departament de Ciències Experimentals i de la Salut
energia libre de relajar la restriccion
Departament de Ciències Experimentals i de la Salut
Departament de Ciències Experimentals i de la Salut
reorganization energy
Departament de Ciències Experimentals i de la Salut
Conclusiones (?)
• “Small distortions of a substrate conformation
that cause large increases in strain energy
cannot be caused by binding to the enzyme”
(Levitt, 1972)
• “(...) it is probably apt to say that in the
enzyme-substrate complex, the enzyme is
often strained, whereas the substrate is often
stressed” (Fersht, 1998)
• Las pocimas de Circe no fueron suficientes...
• ...y fue el (famoso) entorno el que ayudo a
los hombres de Ulises a convertirse en
cerdos...
Departament de Ciències Experimentals i de la Salut
Agradecimientos
Prof. Arieh Warshel
Dr. Avital Shurki
Dr. Marek Štrajbl
Dr. Jan Florián
EMBO
Ramón y Cajal
Departament de Ciències Experimentals i de la Salut
efecto “jaula” (cage effect)
Departament de Ciències Experimentals i de la Salut
TSS: dipols preorientats

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on the Circe effect in enzyme catalysis