ISDA

Deposition Date 2012-05-16

Release Date 2012-10-03

Last Version Date 2023-09-13

Entry Detail

PDB ID:

4F7Z

Keywords:

EXOCYTOSIS

Title:

Conformational dynamics of exchange protein directly activated by cAMP

Biological Source:

Source Organism:

Mus musculus (Taxon ID: 10090)

Host Organism:

Escherichia coli

Method Details:

Experimental Method:

X-RAY DIFFRACTION

Resolution:

2.60 Å

R-Value Free:

0.28

R-Value Work:

0.22

R-Value Observed:

0.22

Space Group:

P 21 21 21

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Macromolecular Entities

Protein Blast

Polymer Type:polypeptide(L)
Molecule:Rap guanine nucleotide exchange factor 4
Gene (Uniprot):Rapgef4
Mutations:F435G
Chain IDs:A
Chain Length:999
Number of Molecules:1
Biological Source:Mus musculus

UniProt ID:Q9EQZ6 Pfam ID:PF00027, PF00610, PF00618, PF00617

Ligand Molecules

GOL

Primary Citation

Structural analyses of a constitutively active mutant of exchange protein directly activated by cAMP.

White, M.A, Li, S, Tsalkova, T, Mei, F.C, Liu, T, Woods, V.L, Cheng, X.Show

Plos One 7 e49932 e49932 (2012)

PMID: 23189173 DOI: 10.1371/journal.pone.0049932

Abstact

Exchange proteins directly activated by cAMP (EPACs) are important allosteric regulators of cAMP-mediated signal transduction pathways. To understand the molecular mechanism of EPAC activation, we have combined site-directed mutagenesis, X-ray crystallography, and peptide amide hydrogen/deuterium exchange mass spectrometry (DXMS) to probe the structural and conformational dynamics of EPAC2-F435G, a constitutively active EPAC2 mutant. Our study demonstrates that conformational dynamics plays a critical role in cAMP-induced EPAC activation. A glycine mutation at 435 position shifts the equilibrium of conformational dynamics towards the extended active conformation.

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Primary Citation of related structures