Nap1 links transcription elongation, chromatin assembly, and messenger RNP complex biogenesis.

Abstract:

:Chromatin remodeling is central to the regulation of transcription elongation. We demonstrate that the conserved Saccharomyces cerevisiae histone chaperone Nap1 associates with chromatin. We show that Nap1 regulates transcription of PHO5, and the increase in transcript level and the higher phosphatase activity plateau observed for Deltanap1 cells suggest that the net function of Nap1 is to facilitate nucleosome reassembly during transcription elongation. To further our understanding of histone chaperones in transcription elongation, we identified factors that regulate the function of Nap1 in this process. One factor investigated is an essential mRNA export and TREX complex component, Yra1. Nap1 interacts directly with Yra1 and genetically with other TREX complex components and the mRNA export factor Mex67. Additionally, we show that the recruitment of Nap1 to the coding region of actively transcribed genes is Yra1 dependent and that its recruitment to promoters is TREX complex independent. These observations suggest that Nap1 functions provide a new connection between transcription elongation, chromatin assembly, and messenger RNP complex biogenesis.

journal_name

Mol Cell Biol

authors

Del Rosario BC,Pemberton LF

doi

10.1128/MCB.02136-07

subject

Has Abstract

pub_date

2008-04-01 00:00:00

pages

2113-24

issue

7

eissn

0270-7306

issn

1098-5549

pii

MCB.02136-07

journal_volume

28

pub_type

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