7pqe

From Proteopedia

Jump to: navigation, search

Structure of SidJ/CaM bound to SdeA in post-catalysis state

Structural highlights

7pqe is a 3 chain structure with sequence from Homo sapiens and Legionella pneumophila. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Method:Electron Microscopy, Resolution 3.7Å
Ligands:CA, MG
Resources:FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

SIDJ_LEGPH Glutamylase that mediates the covalent attachment of glutamate moieties to SdeA on one of the catalytic residues that is required for its mono-ADP-ribosyltransferase activity (PubMed:31330531, PubMed:31330532). In turn, inhibits SdeA ubiquitinating activity. Glutamylates also related SdeB, SdeC and SidE (PubMed:31123136, PubMed:31330531). Glutamylase activity only occurs in the host since it requires host calmodulin (PubMed:28497808, PubMed:31123136, PubMed:31330531, PubMed:31330532). May also reverse the SdeA-mediated substrate ubiquitination by cleaving the phosphodiester bond that links phosphoribosylated ubiquitin to protein substrates via its deubiquitinase activity (PubMed:28497808).[1] [2] [3] [4]

Publication Abstract from PubMed

Legionella pneumophila (LP) avoids phagocytosis by secreting nearly 300 effector proteins into the host cytosol. SidE family of effectors (SdeA, SdeB, SdeC and SidE) employ phosphoribosyl ubiquitination to target multiple host Rab GTPases and innate immune factors. To suppress the deleterious toxicity of SidE enzymes in a timely manner, LP employs a metaeffector named SidJ. Upon activation by host Calmodulin (CaM), SidJ executes an ATP-dependent glutamylation to modify the catalytic residue Glu860 in the mono-ADP-ribosyl transferase (mART) domain of SdeA. SidJ is a unique glutamylase that adopts a kinase-like fold but contains two nucleotide-binding pockets. There is a lack of consensus about the substrate recognition and catalytic mechanism of SidJ. Here, we determined the cryo-EM structure of SidJ in complex with its substrate SdeA in two different states of catalysis. Our structures reveal that both phosphodiesterase (PDE) and mART domains of SdeA make extensive contacts with SidJ. In the pre-glutamylation state structure of the SidJ-SdeA complex, adenylylated E860 of SdeA is inserted into the non-canonical (migrated) nucleotide-binding pocket of SidJ. Structure-based mutational analysis indicates that SidJ employs its migrated pocket for the glutamylation of SdeA. Finally, using mass spectrometry, we identified several transient autoAMPylation sites close to both the catalytic pockets of SidJ. Our data provide unique insights into the substrate recognition and the mechanism of protein glutamylation by the pseudokinase SidJ.

Structural basis for protein glutamylation by the Legionella pseudokinase SidJ.,Adams M, Sharma R, Colby T, Weis F, Matic I, Bhogaraju S Nat Commun. 2021 Oct 26;12(1):6174. doi: 10.1038/s41467-021-26429-y. PMID:34702826[5]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

Loading citation details..
Citations
4 reviews cite this structure
Ubiquitin-targeted bacterial effectors: rule breakers of the ubiquitin system.
Roberts et al. (2023)
3 more
1 other articles
No citations found

See Also

References

  1. ↑ Qiu J, Yu K, Fei X, Liu Y, Nakayasu ES, Piehowski PD, Shaw JB, Puvar K, Das C, Liu X, Luo ZQ. A unique deubiquitinase that deconjugates phosphoribosyl-linked protein ubiquitination. Cell Res. 2017 Jul;27(7):865-881. PMID:28497808 doi:10.1038/cr.2017.66
  2. ↑ Black MH, Osinski A, Gradowski M, Servage KA, Pawlowski K, Tomchick DR, Tagliabracci VS. Bacterial pseudokinase catalyzes protein polyglutamylation to inhibit the SidE-family ubiquitin ligases. Science. 2019 May 24;364(6442):787-792. doi: 10.1126/science.aaw7446. PMID:31123136 doi:http://dx.doi.org/10.1126/science.aaw7446
  3. ↑ Gan N, Zhen X, Liu Y, Xu X, He C, Qiu J, Liu Y, Fujimoto GM, Nakayasu ES, Zhou B, Zhao L, Puvar K, Das C, Ouyang S, Luo ZQ. Regulation of phosphoribosyl ubiquitination by a calmodulin-dependent glutamylase. Nature. 2019 Jul 22. pii: 10.1038/s41586-019-1439-1. doi:, 10.1038/s41586-019-1439-1. PMID:31330531 doi:http://dx.doi.org/10.1038/s41586-019-1439-1
  4. ↑ Bhogaraju S, Bonn F, Mukherjee R, Adams M, Pfleiderer MM, Galej WP, Matkovic V, Lopez-Mosqueda J, Kalayil S, Shin D, Dikic I. Inhibition of bacterial ubiquitin ligases by SidJ-calmodulin-catalysed glutamylation. Nature. 2019 Jul 22. pii: 10.1038/s41586-019-1440-8. doi:, 10.1038/s41586-019-1440-8. PMID:31330532 doi:http://dx.doi.org/10.1038/s41586-019-1440-8
  5. ↑ Adams M, Sharma R, Colby T, Weis F, Matic I, Bhogaraju S. Structural basis for protein glutamylation by the Legionella pseudokinase SidJ. Nat Commun. 2021 Oct 26;12(1):6174. PMID:34702826 doi:10.1038/s41467-021-26429-y

Contents


PDB ID 7pqe

Drag the structure with the mouse to rotate

Proteopedia Page Contributors and Editors (what is this?)

OCA

Retrieved from "http://proteopedia.org/wiki/index.php/7pqe"
Personal tools