7b7z: Difference between revisions

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== Function ==
== Function ==
[https://www.uniprot.org/uniprot/BIP_CRIGR BIP_CRIGR] Endoplasmic reticulum chaperone that plays a key role in protein folding and quality control in the endoplasmic reticulum lumen (By similarity). Involved in the correct folding of proteins and degradation of misfolded proteins via its interaction with DNAJC10/ERdj5, probably to facilitate the release of DNAJC10/ERdj5 from its substrate (By similarity). Acts as a key repressor of the ERN1/IRE1-mediated unfolded protein response (UPR) (PubMed:29198525). In the unstressed endoplasmic reticulum, recruited by DNAJB9/ERdj4 to the luminal region of ERN1/IRE1, leading to disrupt the dimerization of ERN1/IRE1, thereby inactivating ERN1/IRE1 (PubMed:29198525). Accumulation of misfolded protein in the endoplasmic reticulum causes release of HSPA5/BiP from ERN1/IRE1, allowing homodimerization and subsequent activation of ERN1/IRE1 (PubMed:29198525). Plays an auxiliary role in post-translational transport of small presecretory proteins across endoplasmic reticulum (ER). May function as an allosteric modulator for SEC61 channel-forming translocon complex, likely cooperating with SEC62 to enable the productive insertion of these precursors into SEC61 channel. Appears to specifically regulate translocation of precursors having inhibitory residues in their mature region that weaken channel gating.[UniProtKB:P11021][UniProtKB:P20029]<ref>PMID:29198525</ref>  
[https://www.uniprot.org/uniprot/FICD_HUMAN FICD_HUMAN] Adenylyltransferase that mediates the addition of adenosine 5'-monophosphate (AMP) to specific residues of target proteins. Able to inactivate Rho GTPases in vitro by adding AMP to RhoA, Rac and Cdc42. It is however unclear whether it inactivates GTPases in vivo and physiological substrates probably remain to be identified.<ref>PMID:19362538</ref> <ref>PMID:22266942</ref>  
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== Publication Abstract from PubMed ==
== Publication Abstract from PubMed ==

Latest revision as of 09:06, 21 November 2024

DeAMPylation complex of monomeric FICD and AMPylated BiP (state 1)DeAMPylation complex of monomeric FICD and AMPylated BiP (state 1)

Structural highlights

7b7z is a 2 chain structure with sequence from Cricetulus griseus and Homo sapiens. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Method:X-ray diffraction, Resolution 1.7Å
Ligands:, ,
Resources:FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

FICD_HUMAN Adenylyltransferase that mediates the addition of adenosine 5'-monophosphate (AMP) to specific residues of target proteins. Able to inactivate Rho GTPases in vitro by adding AMP to RhoA, Rac and Cdc42. It is however unclear whether it inactivates GTPases in vivo and physiological substrates probably remain to be identified.[1] [2]

Publication Abstract from PubMed

The endoplasmic reticulum (ER) Hsp70 chaperone BiP is regulated by AMPylation, a reversible inactivating post-translational modification. Both BiP AMPylation and deAMPylation are catalysed by a single ER-localised enzyme, FICD. Here we present crystallographic and solution structures of a deAMPylation Michaelis complex formed between mammalian AMPylated BiP and FICD. The latter, via its tetratricopeptide repeat domain, binds a surface that is specific to ATP-state Hsp70 chaperones, explaining the exquisite selectivity of FICD for BiP's ATP-bound conformation both when AMPylating and deAMPylating Thr518. The eukaryotic deAMPylation mechanism thus revealed, rationalises the role of the conserved Fic domain Glu234 as a gatekeeper residue that both inhibits AMPylation and facilitates hydrolytic deAMPylation catalysed by dimeric FICD. These findings point to a monomerisation-induced increase in Glu234 flexibility as the basis of an oligomeric state-dependent switch between FICD's antagonistic activities, despite a similar mode of engagement of its two substrates - unmodified and AMPylated BiP.

Structures of a deAMPylation complex rationalise the switch between antagonistic catalytic activities of FICD.,Perera LA, Preissler S, Zaccai NR, Prevost S, Devos JM, Haertlein M, Ron D Nat Commun. 2021 Aug 18;12(1):5004. doi: 10.1038/s41467-021-25076-7. PMID:34408154[3]

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

See Also

References

  1. ↑ Worby CA, Mattoo S, Kruger RP, Corbeil LB, Koller A, Mendez JC, Zekarias B, Lazar C, Dixon JE. The fic domain: regulation of cell signaling by adenylylation. Mol Cell. 2009 Apr 10;34(1):93-103. doi: 10.1016/j.molcel.2009.03.008. PMID:19362538 doi:http://dx.doi.org/10.1016/j.molcel.2009.03.008
  2. ↑ Engel P, Goepfert A, Stanger FV, Harms A, Schmidt A, Schirmer T, Dehio C. Adenylylation control by intra- or intermolecular active-site obstruction in Fic proteins. Nature. 2012 Jan 22;482(7383):107-10. doi: 10.1038/nature10729. PMID:22266942 doi:10.1038/nature10729
  3. ↑ Perera LA, Preissler S, Zaccai NR, Prévost S, Devos JM, Haertlein M, Ron D. Structures of a deAMPylation complex rationalise the switch between antagonistic catalytic activities of FICD. Nat Commun. 2021 Aug 18;12(1):5004. PMID:34408154 doi:10.1038/s41467-021-25076-7

7b7z, resolution 1.70Å

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