7OLH

Bacillus subtilis Complex structure 1 of diadenylate cyclase CdaA cytoplasmic domain (CdaACD) and the phosphoglucomutase GlmM short variant (GlmMF369)

7OLH の概要

• エントリーDOI: 10.2210/pdb7olh/pdb
• 分子名称: Phosphoglucosamine mutase, Cyclic di-AMP synthase CdaA (2 entities in total)
• 機能のキーワード: phosphoglucosamine mutase, glucosamine-6-phosphate, glucosamine-1-phosphate, c-di-amp, diadenylate cyclase, glmm, cdaa, daca, protein protein complex, isomerase, heterodimer, protein binding
• 由来する生物種: Bacillus subtilis (strain 168); 詳細
• タンパク質・核酸の鎖数: 12
• 化学式量合計: 412546.98

構造登録者

Pathania, M.,Grundling, A.G.,Freemont, P. (登録日: 2021-05-20, 公開日: 2021-10-27, 最終更新日: 2024-05-01)

主引用文献

Pathania, M.,Tosi, T.,Millership, C.,Hoshiga, F.,Morgan, R.M.L.,Freemont, P.S.,Grundling, A.
Structural basis for the inhibition of the Bacillus subtilis c-di-AMP cyclase CdaA by the phosphoglucomutase GlmM.
J.Biol.Chem., 297:101317-101317, 2021

PubMed Abstract: Cyclic-di-adenosine monophosphate (c-di-AMP) is an important nucleotide signaling molecule that plays a key role in osmotic regulation in bacteria. c-di-AMP is produced from two molecules of ATP by proteins containing a diadenylate cyclase (DAC) domain. In Bacillus subtilis, the main c-di-AMP cyclase, CdaA, is a membrane-linked cyclase with an N-terminal transmembrane domain followed by the cytoplasmic DAC domain. As both high and low levels of c-di-AMP have a negative impact on bacterial growth, the cellular levels of this signaling nucleotide are tightly regulated. Here we investigated how the activity of the B. subtilis CdaA is regulated by the phosphoglucomutase GlmM, which has been shown to interact with the c-di-AMP cyclase. Using the soluble B. subtilis CdaA catalytic domain and purified full-length GlmM or the GlmM variant lacking the C-terminal flexible domain 4, we show that the cyclase and phosphoglucomutase form a stable complex in vitro and that GlmM is a potent cyclase inhibitor. We determined the crystal structure of the individual B. subtilis CdaA and GlmM homodimers and of the CdaA:GlmM complex. In the complex structure, a CdaA dimer is bound to a GlmM dimer in such a manner that GlmM blocks the oligomerization of CdaA and formation of active head-to-head cyclase oligomers, thus suggesting a mechanism by which GlmM acts as a cyclase inhibitor. As the amino acids at the CdaA:GlmM interphase are conserved, we propose that the observed mechanism of inhibition of CdaA by GlmM may also be conserved among Firmicutes.

PubMed: 34678313
DOI: 10.1016/j.jbc.2021.101317

実験手法

X-RAY DIFFRACTION (3.65 Å)