The intrinsic stability of H2B-ubiquitylated nucleosomes and their in vitro assembly/disassembly by histone chaperone NAP1.
Biochim Biophys Acta Gen Subj
; 1864(3): 129497, 2020 03.
Article
en En
| MEDLINE
| ID: mdl-31785324
ABSTRACT
BACKGROUND:
Apart the gene-regulatory functions as docking sites for histone 'readers', some histone modifications could directly affect nucleosome structure. The H2BK34-ubiquitylation deposited by MOF-MSL complex, increases nucleosome dynamics in vitro and promotes donation of one H2A/H2B dimer to histone acceptors.METHODS:
We evaluated temperature-depended stability of H2BK34-ubiquitylated nucleosomes under 'physiological' ionic conditions in the presence or absence of histone acceptor, and examined assembly and disassembly of ubiquitylated nucleosomes in vitro by recombinant mouse NAP1.RESULTS:
H2BK34ub modification is sufficient to promote selective eviction of only one H2A/H2B dimer independently of histone-binding agents. Despite the robust H2A/H2B dimer-displacement effect of mNAP1 with the H2BK34ub (but not unmodified) nucleosomes, NAP1 could assemble symmetrically- or asymmetrically ubiquitylated nucleosomes under 'physiological' conditions in vitro. CONCLUSIONS AND GENERALSIGNIFICANCE:
The increased mobility of one nucleosomal H2A/H2B dimer is an intrinsic nucleosome destabilizing property of H2BK34 ubiquitylation that has the intranucleosome bases. The ability of NAP to reasonably efficiently assemble H2BK34-ubiquitylated nucleosomes supposes a potential mechanism for deposition/distribution of H2BK34ub mark in the MOF-MSL independent manner (for example, during histone dimer exchange upon transcription elongation).Palabras clave
Texto completo:
1
Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Oligopéptidos
/
Histonas
/
Naftalenos
Tipo de estudio:
Prognostic_studies
Límite:
Animals
Idioma:
En
Revista:
Biochim Biophys Acta Gen Subj
Año:
2020
Tipo del documento:
Article