The Arabidopsis thalianaK+-uptake permease 7 (AtKUP7) contains a functional cytosolic adenylate cyclase catalytic centre

Inas Al-Younis, Aloysius Tze Wong, Christoph A Gehring

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Adenylate Cyclases (ACs) catalyze the formation of the second messenger cyclic adenosine 3′, 5′-monophosphate (cAMP) from adenosine 5’-triphosphate (ATP). Although cAMP is increasingly recognized as an important signaling molecule in higher plants, ACs have remained somewhat elusive. Here we used a search motif derived from experimentally tested guanylyl cyclases (GCs), substituted the residues essential for substrate specificity and identified the Arabidopsis thaliana K+-uptake permease 7 (AtKUP7) as one of several candidate ACs. Firstly, we show that a recombinant N-terminal, cytosolic domain of AtKUP71-100 is able to complement the AC-deficient mutant cyaA in Escherichia coli and thus restoring the fermentation of lactose, and secondly, we demonstrate with both enzyme immunoassays and mass spectrometry that a recombinant AtKUP71-100 generates cAMP in vitro.
Original languageEnglish (US)
Pages (from-to)3848-3852
Number of pages5
JournalFEBS Letters
Issue number24PartB
StatePublished - Nov 27 2015

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