6PCK image
Entry Detail
PDB ID:
6PCK
Keywords:
Title:
Crystal structure of human diphosphoinositol polyphosphate phosphohydrolase 1 in complex with 1-IP7
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2019-06-17
Release Date:
2020-04-29
Method Details:
Experimental Method:
Resolution:
1.20 Å
R-Value Free:
0.17
R-Value Work:
0.15
R-Value Observed:
0.15
Space Group:
P 21 21 21
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Diphosphoinositol polyphosphate phosphohydrolase 1
Chain IDs:A
Chain Length:148
Number of Molecules:1
Biological Source:Homo sapiens
Primary Citation
Vip1 is a kinase and pyrophosphatase switch that regulates inositol diphosphate signaling.
Proc.Natl.Acad.Sci.USA 117 9356 9364 (2020)
PMID: 32303658 DOI: 10.1073/pnas.1908875117

Abstact

Inositol diphosphates (PP-IPs), also known as inositol pyrophosphates, are high-energy cellular signaling codes involved in nutrient and regulatory responses. We report that the evolutionarily conserved gene product, Vip1, possesses autonomous kinase and pyrophosphatase domains capable of synthesis and destruction of D-1 PP-IPs. Our studies provide atomic-resolution structures of the PP-IP products and unequivocally define that the Vip1 gene product is a highly selective 1-kinase and 1-pyrophosphatase enzyme whose activities arise through distinct active sites. Kinetic analyses of kinase and pyrophosphatase parameters are consistent with Vip1 evolving to modulate levels of 1-IP7 and 1,5-IP8 Individual perturbations in kinase and pyrophosphatase activities in cells result in differential effects on vacuolar morphology and osmotic responses. Analogous to the dual-functional key energy metabolism regulator, phosphofructokinase 2, Vip1 is a kinase and pyrophosphatase switch whose 1-PP-IP products play an important role in a cellular adaptation.

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