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000626476 1001_ $$aFunke, Franziska Jasmin$$b0
000626476 245__ $$aActivity Regulation of a Glutamine Amidotransferase Bienzyme Complex by Substrate-Induced Subunit Interface Expansion
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000626476 520__ $$aGlutamine amidotransferases are multienzyme machineries in which reactive ammonia is generated by a glutaminase and then transferred through a sequestered protein tunnel to a synthase active site for incorporation into diverse metabolites. To avoid wasteful metabolite consumption, there is a requirement for synchronized catalysis, but any generally applicable mechanistic insight is still lacking. As synthase activity depends on glutamine turnover, we investigated possible mechanisms controlling glutaminase catalysis using aminodeoxychorismate synthase involved in folate biosynthesis as a model. By analyzing this system in distinct states of catalysis, we found that incubation with glutamine leads to a subunit interface expansion by one-third of its original area. These changes completely enclose the glutaminase active site for sequestered catalysis and the subsequent transport of volatile ammonia to the synthase active site. In view of similar rearrangements in other glutamine amidotransferases, our observations may provide a general mechanism for the catalysis synchronization of this multienzyme family.
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000626476 7001_ $$aSchlee, Sandra$$b1
000626476 7001_ $$0P:(DE-H253)PIP1021139$$aBento, Isabel$$b2
000626476 7001_ $$0P:(DE-H253)PIP1007425$$aBourenkov, Gleb$$b3
000626476 7001_ $$0P:(DE-HGF)0$$aSterner, Reinhard$$b4$$eCorresponding author
000626476 7001_ $$0P:(DE-H253)PIP1001283$$aWilmanns, Matthias$$b5$$eCorresponding author
000626476 773__ $$0PERI:(DE-600)2584887-2$$a10.1021/acscatal.4c07438$$gVol. 15, no. 5, p. 4359 - 4373$$n5$$p4359 - 4373$$tACS catalysis$$v15$$x2155-5435$$y2025
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