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Title: An Intramolecular Switch Regulates Phosphoindependent FHA Domain Interactions in Mycobacterium tuberculosis
Authors: Nott, Timothy J.
Kelly, Geoff
Stach, Lasse
Li, Jiejin
Westcott, Sarah
Patel, Dony
Hunt, Debbie M.
Howell, Steven
Buxton, Roger S.
O'Hare, Helen M.
Smerdon, Stephen J.
First Published: 24-Mar-2009
Publisher: American Association for the Advancement of Science (AAAS)
Citation: Science Signaling, 2009, 2 (63), p. ra12.
Abstract: Forkhead-associated (FHA) domains have gained considerable prominence as ubiquitous phosphothreonine-dependent binding modules; however, their precise roles in serine and threonine kinase (STK) pathways and mechanisms of regulation remain unclear. From experiments with Rv1827, an FHA domain–containing protein from Mycobacterium tuberculosis, we derived a complete molecular description of an FHA-mediated STK signaling process. First, binding of the FHA domain to each of three metabolic enzyme complexes regulated their catalytic activities but did not require priming phosphorylation. However, phosphorylation of a threonine residue within a conserved amino-terminal motif of Rv1827 triggered its intramolecular association with the FHA domain of Rv1827, thus blocking its interactions with each of the three enzymes. The solution structure of this inactivated form and further mutagenic studies showed how a previously unidentified intramolecular phosphoswitch blocked the access of the target enzymes to a common FHA interaction surface and how this shared surface accommodated three functionally related, but structurally diverse, binding partners. Thus, our data reveal an unsuspected versatility in the FHA domain that allows for the transformation of multiple kinase inputs into various downstream regulatory signals.
ISSN: 1945-0877
Type: Article
Description: This paper was published as Science Signaling, 2009, 2 (63), p. ra12. It is available from;2/63/ra12?view=abstract. Doi: 10.1126/scisignal.2000212
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Appears in Collections:Published Articles, Dept. of Infection, Immunity and Inflammation

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