ISDA

Deposition Date 2014-08-19

Release Date 2015-09-23

Last Version Date 2024-11-06

Entry Detail

PDB ID:

4R4L

Keywords:

DNA BINDING PROTEIN

Title:

Crystal structure of wt cGMP dependent protein kinase I alpha (PKGI alpha) leucine zipper

Biological Source:

Source Organism:

Homo sapiens (Taxon ID: 9606)

Host Organism:

Escherichia coli

Method Details:

Experimental Method:

X-RAY DIFFRACTION

Resolution:

2.25 Å

R-Value Free:

0.28

R-Value Work:

0.25

R-Value Observed:

0.25

Space Group:

P 62 2 2

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Macromolecular Entities

Structures with similar UniProt ID

Protein Blast

Polymer Type:polypeptide(L)
Molecule:cGMP-dependent protein kinase 1
Gene (Uniprot):PRKG1
Chain IDs:A, B, C
Chain Length:49
Number of Molecules:3
Biological Source:Homo sapiens

UniProt ID:Q13976 Pfam ID:PF16808 EC:2.7.11.12

Ligand Molecules

HEZ

SO4

Primary Citation

Structures of cGMP-Dependent Protein Kinase (PKG) I alpha Leucine Zippers Reveal an Interchain Disulfide Bond Important for Dimer Stability.

Qin, L, Reger, A.S, Guo, E, Yang, M.P, Zwart, P, Casteel, D.E, Kim, C.Show

Biochemistry 54 4419 4422 (2015)

PMID: 26132214 DOI: 10.1021/acs.biochem.5b00572

Abstact

cGMP-dependent protein kinase (PKG) Iα is a central regulator of smooth muscle tone and vasorelaxation. The N-terminal leucine zipper (LZ) domain dimerizes and targets PKG Iα by interacting with G-kinase-anchoring proteins. The PKG Iα LZ contains C42 that is known to form a disulfide bond upon oxidation and to activate PKG Iα. To understand the molecular details of the PKG Iα LZ and C42-C42' disulfide bond, we determined crystal structures of the PKG Iα wild-type (WT) LZ and C42L LZ. Our data demonstrate that the C42-C42' disulfide bond dramatically stabilizes PKG Iα and that the C42L mutant mimics the oxidized WT LZ structurally.

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