Biochemical and biophysical comparison of human and mouse beta-2 microglobulin reveals the molecular determinants of low amyloid propensity.
FEBS J
; 287(3): 546-560, 2020 02.
Article
en En
| MEDLINE
| ID: mdl-31420997
ABSTRACT
The molecular bases of amyloid aggregation propensity are still poorly understood, especially for proteins that display a stable folded native structure. A prototypic example is human beta-2 microglobulin (ß2m), which, when accumulated in patients, gives rise to dialysis-related amyloidosis. Interestingly, although the physiologic concentration of ß2m in mice is five times higher than that found in human patients, no amyloid deposits are observed in mice. Moreover, murine ß2m (mß2m) not only displays a lower amyloid propensity both in vivo and in vitro but also inhibits the aggregation of human ß2m in vitro. Here, we compared human and mß2m for their aggregation propensity, ability to form soluble oligomers, stability, three-dimensional structure and dynamics. Our results indicate that mß2m low-aggregation propensity is due to two concomitant aspects the low-aggregation propensity of its primary sequence combined with the absence of high-energy amyloid-competent conformations under native conditions. The identification of the specific properties determining the low-aggregation propensity of mouse ß2m will help delineate the molecular risk factors which cause a folded protein to aggregate.
Palabras clave
Texto completo:
1
Colección:
01-internacional
Banco de datos:
MEDLINE
Asunto principal:
Microglobulina beta-2
/
Pliegue de Proteína
/
Amiloide
Tipo de estudio:
Prognostic_studies
/
Risk_factors_studies
Límite:
Animals
/
Humans
Idioma:
En
Revista:
FEBS J
Asunto de la revista:
BIOQUIMICA
Año:
2020
Tipo del documento:
Article
País de afiliación:
Suecia