Expression of the first N-glycosylation gene in the dolichol pathway, ALG7, is regulated at two major control points in the G1 phase of the Saccharomyces cerevisiae cell cycle.

Abstract:

:The Saccharomyces cerevisiae ALG7 gene, which functions by initiating the dolichol pathway of protein N-glycosylation, displays properties of an early growth-response gene. To initiate studies of the involvement of ALG7 in cellular proliferation, we have now more precisely analyzed ALG7 expression in the G1 phase of cell cycle. We show that the rapid rate of ALG7 mRNA accumulation following growth stimulation was attenuated soon thereafter and that ALG7 growth induction occurred irrespective of alpha-factor. ALG7 growth induction was observed in mutants conditionally defective for reentry into the cell cycle from the stationary phase, indicating that the induction occurred prior to the performance of START. In addition, the steady-state levels of ALG7 mRNAs declined four-fold in response to START-I cell division arrest brought about by alpha-factor treatment later in G1. Importantly, deregulated expression of ALG7 resulted in an aberrant alpha-factor response. Our data not only indicate that ALG7 expression is regulated at two critical control points in G1 that determine the proliferative potential of cells, but also provide a link between ALG7 and START.

journal_name

Exp Cell Res

authors

Pretel R,Lennon K,Bird A,Kukuruzinska MA

doi

10.1006/excr.1995.1255

subject

Has Abstract

pub_date

1995-08-01 00:00:00

pages

477-86

issue

2

eissn

0014-4827

issn

1090-2422

pii

S0014-4827(85)71255-4

journal_volume

219

pub_type

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