scholarly journals The plasma membrane ferrireductase activity of Saccharomyces cerevisiae is partially controlled by cyclic AMP

1991 ◽  
Vol 280 (2) ◽  
pp. 545-548 ◽  
Author(s):  
E Lesuisse ◽  
B Horion ◽  
P Labbe ◽  
F Hilger
Keyword(s):  
Saccharomyces Cerevisiae ◽  
Plasma Membrane ◽  
Cyclic Amp ◽  
Double Mutant ◽  
Synthetic Medium ◽  
Iron Limitation ◽  
Permissive Temperature ◽  
Extract Content ◽  
Dependent Protein ◽  
Membrane Bound

The plasma-membrane-bound ferrireductase activity of ras1 and ras2 mutants of Saccharomyces cerevisiae is not induced in response to iron limitation. This phenotype was suppressed by the bcy1 mutation in ras2 but not in ras1 mutants. The cellular haem content of ras-1-bearing strains decreased dramatically when cells were grown in semi-synthetic medium (low yeast extract content), which could account for their very low ferrireductase activity. The ferrireductase activity of cdc25 and cdc35 mutants dropped when the cells were shifted to a non-permissive temperature. This drop was prevented in the double mutant cdc35 sra5 by adding cyclic AMP to the growth medium. We propose that ferrireductase activity is under the control of a cyclic AMP-dependent protein phosphorylation.

Heat shock response of Saccharomyces cerevisiae mutants altered in cyclic AMP-dependent protein phosphorylation

1987 ◽  
Vol 7 (1) ◽  
pp. 244-250
Author(s):  
D Y Shin ◽  
K Matsumoto ◽  
H Iida ◽  
I Uno ◽  
T Ishikawa
Keyword(s):  
Heat Treatment ◽  
Saccharomyces Cerevisiae ◽  
Heat Shock ◽  
Cyclic Amp ◽  
Heat Shock Proteins ◽  
Temperature Shift ◽  
G1 Phase ◽  
Shock Response ◽  
Dependent Protein ◽  
Shock Proteins

When Saccharomyces cerevisiae cells grown at 23 degrees C were transferred to 36 degrees C, they initiated synthesis of heat shock proteins, acquired thermotolerance to a lethal heat treatment given after the temperature shift, and arrested their growth transiently at the G1 phase of the cell division cycle. The bcy1 mutant which resulted in production of cyclic AMP (cAMP)-independent protein kinase did not synthesize the three heat shock proteins hsp72A, hsp72B, and hsp41 after the temperature shift. The bcy1 cells failed to acquire thermotolerance to the lethal heat treatment and were not arrested at the G1 phase after the temperature shift. In contrast, the cyr1-2 mutant, which produced a low level of cAMP, constitutively produced three heat shock proteins and four other proteins without the temperature shift and was resistant to the lethal heat treatment. The results suggest that a decrease in the level of cAMP-dependent protein phosphorylation results in the heat shock response, including elevated synthesis of three heat shock proteins, acquisition of thermotolerance, and transient arrest of the cell cycle.

scholarly journals Cloning and characterization of BCY1, a locus encoding a regulatory subunit of the cyclic AMP-dependent protein kinase in Saccharomyces cerevisiae.

1987 ◽  
Vol 7 (4) ◽  
pp. 1371-1377 ◽  
Author(s):  
T Toda ◽  
S Cameron ◽  
P Sass ◽  
M Zoller ◽  
J D Scott ◽  
...  
Keyword(s):  
Saccharomyces Cerevisiae ◽  
Protein Kinase ◽  
Cyclic Amp ◽  
Carbon Sources ◽  
Regulatory Subunit ◽  
Dependent Protein Kinase ◽  
Yeast Saccharomyces Cerevisiae ◽  
Regulatory Subunits ◽  
Dependent Protein

We have cloned a gene (BCY1) from the yeast Saccharomyces cerevisiae that encodes a regulatory subunit of the cyclic AMP-dependent protein kinase. The encoded protein has a structural organization similar to that of the RI and RII regulatory subunits of the mammalian cyclic AMP-dependent protein kinase. Strains of S. cerevisiae with disrupted BCY1 genes do not display a cyclic AMP-dependent protein kinase in vitro, fail to grow on many carbon sources, and are exquisitely sensitive to heat shock and starvation.

The Saccharomyces cerevisiae SRK1 gene, a suppressor of bcy1 and ins1, may be involved in protein phosphatase function

1991 ◽  
Vol 11 (6) ◽  
pp. 3369-3373
Author(s):  
R B Wilson ◽  
A A Brenner ◽  
T B White ◽  
M J Engler ◽  
J P Gaughran ◽  
...  
Keyword(s):  
Saccharomyces Cerevisiae ◽  
Protein Kinase ◽  
Cyclic Amp ◽  
Protein Phosphatase ◽  
Shuttle Vector ◽  
Temperature Sensitive ◽  
Protein Kinase Activity ◽  
Dependent Protein Kinase ◽  
Cycle Arrest ◽  
Dependent Protein

The Saccharomyces cerevisiae SRK1 gene, when expressed on a low-copy shuttle vector, partially suppresses the phenotype associated with elevated levels of cyclic AMP-dependent protein kinase activity and suppresses the temperature-sensitive cell cycle arrest of the ins1 mutant. SRK1 is located on chromosome IV, 3 centimorgans from gcn2. A mutant carrying a deletion mutation in srk1 is viable. SRK1 encodes a 140-kDa protein with homology to the dis3+ protein from Schizosaccharomyces pombe. The ability of SRK1 to alleviate partially the defects caused by high levels of cyclic AMP-dependent protein kinase and the similarity of its encoded protein to dis3+ suggest that SRK1 may have a role in protein phosphatase function.

scholarly journals Altered Na+ and Li+Homeostasis in Saccharomyces cerevisiae Cells Expressing the Bacterial Cation Antiporter NhaA

1998 ◽  
Vol 180 (12) ◽  
pp. 3131-3136 ◽  
Author(s):  
Roc Ros ◽  
Consuelo Montesinos ◽  
Abraham Rimon ◽  
Etana Padan ◽  
Ramón Serrano
Keyword(s):  
Saccharomyces Cerevisiae ◽  
Plasma Membrane ◽  
Double Mutant ◽  
Vacuolar Membrane ◽  
Intracellular Sodium ◽  
Intracellular Pool ◽  
Sodium Accumulation ◽  
Sodium Tolerance ◽  
Yeast Mutants ◽  
In Cells

ABSTRACT The bacterial Na+(Li+)/H+antiporter NhaA has been expressed in the yeast Saccharomyces cerevisiae. NhaA was present in both the plasma membrane and internal membranes, and it conferred lithium but not sodium tolerance. In cells containing the yeast Ena1-4 (Na+, Li+) extrusion ATPase, the extra lithium tolerance conferred by NhaA was dependent on a functional vacuolar H+ ATPase and correlated with an increase of lithium in an intracellular pool which exhibited slow efflux of cations. In yeast mutants without (Na+, Li+) ATPase, lithium tolerance conferred by NhaA was not dependent on a functional vacuolar H+ ATPase and correlated with a decrease of intracellular lithium. NhaA was able to confer sodium tolerance and to decrease intracellular sodium accumulation in a double mutant devoid of both plasma membrane (Na+, Li+) ATPase and vacuolar H+ ATPase. These results indicate that the bacterial antiporter NhaA expressed in yeast is functional at both the plasma membrane and the vacuolar membrane. The phenotypes conferred by its expression depend on the functionality of plasma membrane (Na+, Li+) ATPase and vacuolar H+ ATPase.

REGULATION OF REPRESSIBLE ACID PHOSPHATASE BY CYCLIC AMP IN SACCHAROMYCES CEREVISIAE

Genetics ◽  
1984 ◽  
Vol 108 (1) ◽  
pp. 53-66 ◽  
Author(s):  
Kunihiro Matsumoto ◽  
Isao Uno ◽  
Tatsuo Ishikawa
Keyword(s):  
Saccharomyces Cerevisiae ◽  
Acid Phosphatase ◽  
Protein Kinase ◽  
Cyclic Amp ◽  
Adenylate Cyclase ◽  
Dependent Protein Kinase ◽  
Dependent Protein ◽  
Low Levels ◽  
Constitutive Synthesis ◽  
Independent Protein

ABSTRACT One of the cyr1 mutants (cyr1-2) in yeast produced low levels of adenylate cyclase and cyclic AMP at 25° and was unable to derepress acid phosphatase. Addition of cyclic AMP to the cyr1-2 cultures elevated the level of repressible acid phosphatase activity. The bcy1 mutation, which suppresses the cyr1-2 mutation by allowing activity of a cyclic AMP-independent protein kinase, also allows acid phosphatase synthesis without restoring adenylate cyclase activity. The CYR3 mutant had structurally altered cyclic AMP-dependent protein kinase and was unable to derepress acid phosphatase. The cyr1 locus was different from pho2, pho4 and pho81, which were known to regulate acid phosphatase synthesis. Mutants carrying cyr1-2 and pho80, PHO81c, PHO82 or pho85 mutations, which confer constitutive synthesis of repressible acid phosphatase, produced acid phosphatase. The cyr1-2 mutant produced significantly low levels of invertase and α- d-glucosidase. These results indicated that cyclic AMP-dependent protein kinase exerts its function in the synthesis of repressible acid phosphatase and other enzymes.

Control of Saccharomyces cerevisiae catalase T gene (CTT1) expression by nutrient supply via the RAS-cyclic AMP pathway

1989 ◽  
Vol 9 (3) ◽  
pp. 1309-1315
Author(s):  
P H Bissinger ◽  
R Wieser ◽  
B Hamilton ◽  
H Ruis
Keyword(s):  
Saccharomyces Cerevisiae ◽  
Cyclic Amp ◽  
Fusion Gene ◽  
Negative Control ◽  
G1 Arrest ◽  
Camp Pathway ◽  
Gene Coding ◽  
Dependent Protein ◽  
Phosphorus Source ◽  
High Level

In Saccharomyces cerevisiae, lack of nutrients triggers a pleiotropic response characterized by accumulation of storage carbohydrates, early G1 arrest, and sporulation of a/alpha diploids. This response is thought to be mediated by RAS proteins, adenylate cyclase, and cyclic AMP (cAMP)-dependent protein kinases. This study shows that expression of the S. cerevisiae gene coding for a cytoplasmic catalase T (CTT1) is controlled by this pathway: it is regulated by the availability of nutrients. Lack of a nitrogen, sulfur, or phosphorus source causes a high-level expression of the gene. Studies with strains with mutations in the RAS-cAMP pathway and supplementation of a rca1 mutant with cAMP show that CTT1 expression is under negative control by a cAMP-dependent protein kinase and that nutrient control of CTT1 gene expression is mediated by this pathway. Strains containing a CTT1-Escherichia coli lacZ fusion gene have been used to isolate mutants with mutations in the pathway. Mutants characterized in this investigation fall into five complementation groups. Both cdc25 and ras2 alleles were identified among these mutants.

Sign in / Sign up

Export Citation Format

Share Document