Experimental evidence for the role of domain swapping in the evolution of the histone fold.
Proc Natl Acad Sci U S A
; 108(33): 13462-7, 2011 Aug 16.
Article
em En
| MEDLINE
| ID: mdl-21813758
ABSTRACT
The histone fold forms the fundamental endoskeleton of the protein core of the nucleosome and is also found in several transcription factors. We have investigated the evolutionary origins of this ubiquitous protein motif, which is found soluble exclusively as an antiparallel (handshake motif) dimer. We introduced a three amino acid insertion into the middle of a homodimeric archaeal histone fold motif. The engineered molecule was found to be a soluble and stable monomer with properties consistent with a four-helix-bundle protein. The experimental evidence presented here support the hypothesis that the handshake association motif characteristic of present-day histone dimers is the evolutionary product of domain swapping between two four-helix bundle domains, each of which derived from the tandem duplication of a primitive helix-strand-helix unit.
Texto completo:
1
Bases de dados:
MEDLINE
Assunto principal:
Histonas
/
Evolução Molecular
/
Proteínas Arqueais
/
Multimerização Proteica
Idioma:
En
Revista:
Proc Natl Acad Sci U S A
Ano de publicação:
2011
Tipo de documento:
Article
País de afiliação:
Estados Unidos