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Nhp6, an HMG1 protein, functions in SNR6 transcription by RNA polymerase III in S. cerevisiae.

Abstract：

:Nhp6A and Nhp6B are HMG1-like proteins required for the growth of S. cerevisiae at elevated temperatures. We show that the conditional lethality of an nhp6 strain results from defective transcription of SNR6 (U6 snRNA) by RNA polymerase III. Overexpression of U6 snRNA or Brf1, a limiting component of TFIIIB, and an activating mutation (PCF1-1) in TFIIIC were each found to suppress the nhp6 growth defect. Additionally, U6 snRNA levels, which are reduced over 10-fold in nhp6 cells at 37 degrees C, were restored by Brf1 overexpression and by PCF1-1. Nhp6A protein specifically enhanced TFIIIC-dependent, but not TATA box-dependent, SNR6 transcription in vitro by facilitating TFIIIC binding to the SNR6 promoter. Thus, Nhp6 has a direct role in transcription complex assembly at SNR6.

journal_name

Mol Cell

journal_title

Molecular cell

authors

Kruppa M,Moir RD,Kolodrubetz D,Willis IM

doi

10.1016/s1097-2765(01)00179-4

subject

Has Abstract

pub_date

2001-02-01 00:00:00

pages

309-18

issue

2

eissn

1097-2765

issn

1097-4164

pii

S1097-2765(01)00179-4

journal_volume

7

pub_type

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