Cyclic nucleotide PDEs (phosphodiesterases) regulate cellular levels of cAMP and cGMP by controlling the rate of degradation. Several mammalian PDE isoforms possess N-terminal GAF (found in cGMP PDEs, Anabaena adenylate cyclases and Escherichia coli FhlA; where FhlA is formate hydrogen lyase transcriptional activator) domains that bind cyclic nucleotides. Similarly, the CyaB1 and CyaB2 ACs (adenylate cyclases) of the cyanobacterium Anabaena PCC 7120 bind cAMP through one (CyaB1) or two (CyaB2) N-terminal GAF domains and mediate autoregulation of the AC domain. Sodium inhibits the activity of CyaB1, CyaB2 and mammalian PDE2A in vitro through modulation of GAF domain function. Furthermore, genetic ablation of cyaB1 and cyaB2 gives rise to Anabaena strains defective in homoeostasis at limiting sodium. Sodium regulation of GAF domain function has therefore been conserved since the eukaryotic/prokaryotic divergence. The GAF domain is the first identified protein domain to directly sense and signal changes in environmental sodium.
Skip Nav Destination
Article navigation
November 2007
-
Cover Image
Cover Image
- PDF Icon PDF LinkFront Matter
- PDF Icon PDF LinkTable of Contents
Conference Article|
October 25 2007
Sodium regulation of GAF domain function
M.J. Cann
M.J. Cann
1
1School of Biological and Biomedical Sciences, Durham University, South Road, Durham DH1 3LE, U.K.
1email m.j.cann@durham.ac.uk
Search for other works by this author on:
Publisher: Portland Press Ltd
Received:
May 11 2007
Online ISSN: 1470-8752
Print ISSN: 0300-5127
© The Authors Journal compilation © 2007 Biochemical Society
2007
Biochem Soc Trans (2007) 35 (5): 1032–1034.
Article history
Received:
May 11 2007
Citation
M.J. Cann; Sodium regulation of GAF domain function. Biochem Soc Trans 1 November 2007; 35 (5): 1032–1034. doi: https://doi.org/10.1042/BST0351032
Download citation file:
Sign in
Don't already have an account? Register
Sign in to your personal account
You could not be signed in. Please check your email address / username and password and try again.
Captcha Validation Error. Please try again.