2017
DOI: 10.1107/s2053230x17002485
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Similarities in the structure of the transcriptional repressor AmtR in two different space groups suggest a model for the interaction with GlnK

Abstract: AmtR belongs to the TetR family of transcription regulators and is a global nitrogen regulator that is induced under nitrogen-starvation conditions in Corynebacterium glutamicum. AmtR regulates the expression of transporters and enzymes for the assimilation of ammonium and alternative nitrogen sources, for example urea, amino acids etc. The recognition of operator DNA by homodimeric AmtR is not regulated by small-molecule effectors as in other TetR-family members but by a trimeric adenylylated P-type signal tr… Show more

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Cited by 2 publications
(3 citation statements)
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“…RNAseq analysis revealed higher expression of genes belonging to the AmtR regulon of nitrogen starvation in GluA T5 and the parental strain GluA T0 than in GluA T7, which carries GltB E686Q (Additional file 2 : Tables S1 and S2). Binding to operator DNA by homodimeric AmtR is not released by a small-molecule effector, but by GlnK when adenylylated at tyrosine residue 51 [ 61 ], likely in a 6:6 stoichiometric (AmtR 2 ) 3 –(GlnK 3 ) 2 complex [ 62 ]. The adenylation status of PII-type signal transduction protein GlnK is controlled by adenyltransferase GlnD under nitrogen starvation, which is most likely perceived as ammonium limitation [ 63 ].…”
Section: Discussionmentioning
confidence: 99%
“…RNAseq analysis revealed higher expression of genes belonging to the AmtR regulon of nitrogen starvation in GluA T5 and the parental strain GluA T0 than in GluA T7, which carries GltB E686Q (Additional file 2 : Tables S1 and S2). Binding to operator DNA by homodimeric AmtR is not released by a small-molecule effector, but by GlnK when adenylylated at tyrosine residue 51 [ 61 ], likely in a 6:6 stoichiometric (AmtR 2 ) 3 –(GlnK 3 ) 2 complex [ 62 ]. The adenylation status of PII-type signal transduction protein GlnK is controlled by adenyltransferase GlnD under nitrogen starvation, which is most likely perceived as ammonium limitation [ 63 ].…”
Section: Discussionmentioning
confidence: 99%
“…Based on the crystal structure of C. glutamicum AmtR, a model for interaction of AmtR with adGlnK has been proposed. In this model, two adGlnK trimers bind to an AmtR hexamer and block the binding of the AmtR operator (Sevvana et al, 2017).…”
Section: Discussionmentioning
confidence: 99%
“…Deletion of the glnK gene abolishes the upregulation of AmtR-controlled genes, and the derepression of genes under AmtR only occurs if GlnK is adenylylated at position 51, since exchanging Tyr51 for phenylalanine resulted in an identical phenotype to those observed for glnK deletion mutants (Nolden et al, 2001;Beckers et al, 2005). Whereas the interaction between AmtR and its target DNA has been well characterized, the details and structural implications of the adenylylation of GlnK as well as the mechanism by which adGlnK derepresses AmtR-controlled gene transcription currently remain largely elusive (Palanca & Rubio, 2016;Sevvana et al, 2017).…”
Section: Introductionmentioning
confidence: 99%