Fast antibody fragment motion: flexible linkers act as entropic spring.
Sci Rep
; 6: 22148, 2016 Mar 29.
Article
en En
| MEDLINE
| ID: mdl-27020739
ABSTRACT
A flexible linker region between three fragments allows antibodies to adjust their binding sites to an antigen or receptor. Using Neutron Spin Echo Spectroscopy we observed fragment motion on a timescale of 7 ns with motional amplitudes of about 1 nm relative to each other. The mechanistic complexity of the linker region can be described by a spring model with Brownian motion of the fragments in a harmonic potential. Displacements, timescale, friction and force constant of the underlying dynamics are accessed. The force constant exhibits a similar strength to an entropic spring, with friction of the fragment matching the unbound state. The observed fast motions are fluctuations in pre-existing equilibrium configurations. The Brownian motion of domains in a harmonic potential is the appropriate model to examine functional hinge motions dependent on the structural topology and highlights the role of internal forces and friction to function.
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Bases de datos:
MEDLINE
Asunto principal:
Algoritmos
/
Fragmentos de Inmunoglobulinas
/
Simulación de Dinámica Molecular
/
Dominios Proteicos
Límite:
Humans
Idioma:
En
Revista:
Sci Rep
Año:
2016
Tipo del documento:
Article
País de afiliación:
Estados Unidos