Elements from the cAMP signaling pathway are involved in the control of expression of the yeast gluconeogenic gene FBP1

FEBS Letters

Gancedo, Juana M¹  Zaragoza, Oscar¹ 

[1] Instituto de Investigaciones Biomédicas ‘Alberto Sols’, CSIC-UAM, Arturo Duperier 4, E-28029 Madrid, Spain

关键词: cAMP;    Catabolite repression;    Fructose-1;    6-bisphosphatase;    CAT8;    SIP4;    Saccharomyces cerevisiae;   

DOI  :  10.1016/S0014-5793(01)02922-2

学科分类：生物化学/生物物理

来源: John Wiley & Sons Ltd.

【 摘 要 】

cAMP represses the transcription of some Saccharomyces cerevisiae genes sensitive to catabolite repression. The effect of cAMP on the expression of FBP1, encoding fructose-1,6-bisphosphatase (FbPase), has been further investigated. In yeast cells shifted to a derepressing medium, synthesis of FbPase was delayed if the strong decrease in intracellular cAMP, which occurs during the shift, was prevented. A similar delay occurred in a RAS2^val19 strain, while in a tpk1^w strain, with weak protein kinase A activity, induction of FbPase occurred earlier than in a TPK1 strain. In the tpk1^w strain, proteins which bind the UAS1 element of FBP1 were present during growth on glucose but they were only weakly operative. Expression of CAT8 and SIP4, encoding proteins which bind the UAS2 element, was blocked by a high concentration of cAMP, but catabolite repression of these genes was not much relieved in a tpk1^w strain. We conclude that in S. cerevisiae, as reported for Schizosaccharomyces pombe, control of FBP1 requires both cAMP-dependent and independent pathways; however, the mechanisms operating in the two yeasts are different.

【 授权许可】

Unknown