HA-detected experiments for the backbone assignment of intrinsically disordered proteins.
J Biomol NMR
; 47(3): 171-81, 2010 Jul.
Article
em En
| MEDLINE
| ID: mdl-20437194
ABSTRACT
We propose a new alpha proton detection based approach for the sequential assignment of natively unfolded proteins. The proposed protocol superimposes on following features HA-detection (1) enables assignment of natively unfolded proteins at any pH, i.e., it is not sensitive to rapid chemical exchange undergoing in natively unfolded proteins even at moderately high pH. (2) It allows straightforward assignment of proline-rich polypeptides without additional proline-customized experiments. (3) It offers more streamlined and less ambiguous assignment based on solely intraresidual (15)N(i)-(13)C'(i)-H(alpha)(i) (or (15)N(i)-(13)C(alpha)(i)-H(alpha)(i)) and sequential (15)N(i + 1)-(13)C'(i)-H(alpha)(i) (or (15)N(i + 1)-(13)C(alpha)(i)-H(alpha)(i)) correlation experiments together with efficient use of chemical shifts of (15)N and (13)C' nuclei, which show smaller dependence on residue type. We have tested the proposed protocol on two proteins, small globular 56-residue GB1, and highly disordered, proline-rich 47-residue fifth repeat of EspF(U). Using the proposed approach, we were able to assign 90% of (1)H(alpha), (13)C(alpha), (13)C', (15)N chemical shifts in EspF(U). We reckon that the HA-detection based strategy will be very useful in the assignment of natively unfolded proline-rich proteins or polypeptide chains.
Texto completo:
1
Coleções:
01-internacional
Temas:
Geral
Base de dados:
MEDLINE
Assunto principal:
Proteínas
/
Ressonância Magnética Nuclear Biomolecular
Idioma:
En
Revista:
J Biomol NMR
Assunto da revista:
BIOLOGIA MOLECULAR
/
DIAGNOSTICO POR IMAGEM
/
MEDICINA NUCLEAR
Ano de publicação:
2010
Tipo de documento:
Article
País de afiliação:
Finlândia