Alpha-factor inhibition of the rate of cell passage through the "start" step of cell division in Saccharomyces cerevisiae yeast: estimation of the division delay per alpha-factor.receptor complex.

Abstract:

:A highly sensitive, kinetically unambiguous assay for alpha-factor-induced delay of cell passage through the "start" step of cell division in yeast is presented. The assay employs perfusion with periodic microscopy to monitor the bud emergence kinetics on the 20% of cells within an exponentially growing population which exist prior to the alpha-factor execution point of start. The t1/2 for cell passage through start by this population of cells is 31 min in the absence of alpha-factor. The inhibition constant, KI, represents the alpha-factor concentration which produces a 50% inhibition of this rate and is equal to 2 X 10(-10) M. A second assay for maximal cell division arrest by alpha-factor on whole populations of cells is presented. This assay shows a maximum cell division arrest time of 125 +/- 5 h at saturating alpha-factor, and a K50 (that is, an alpha-factor concentration which produces a half-maximal response) of 2.5 X 10(-8) M. Both assays were performed in the effective absence of alpha-factor inactivation. Values of the dissociation constant KD and total number of receptors per cell which specifically mediate cell division arrest or delay were estimated to be 2.5 X 10(-8) M and 10(4), respectively. These estimates, along with the quantitative dose-response data for division arrest which are presented here, are consistent with each receptor.alpha-factor complex which is present on the cell at equilibrium producing a 43 +/- 10 s delay of cell passage through start. Surprisingly, this number is constant within twofold over the entire range of cellular division arrest responses to alpha-factor, that is, from a 1.9-fold inhibition of the rate of cell passage through start at 0.17 nM alpha-factor to a 125 +/- 5 h maximum arrest at saturating alpha-factor concentrations of greater than 170 nM. The possible significance of this observation toward the mechanism of alpha-factor-induced cell division arrest is discussed.

journal_name

Exp Cell Res

authors

Moore SA

doi

10.1016/0014-4827(87)90173-x

subject

Has Abstract

pub_date

1987-08-01 00:00:00

pages

411-25

issue

2

eissn

0014-4827

issn

1090-2422

journal_volume

171

pub_type

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