2PMI image
Deposition Date 2007-04-23
Release Date 2007-12-11
Last Version Date 2023-08-30
Entry Detail
PDB ID:
2PMI
Title:
Structure of the Pho85-Pho80 CDK-cyclin Complex of the Phosphate-responsive Signal Transduction Pathway with Bound ATP-gamma-S
Biological Source:
Source Organism:
Method Details:
Experimental Method:
Resolution:
2.90 Å
R-Value Free:
0.32
R-Value Work:
0.28
R-Value Observed:
0.28
Space Group:
P 31 2 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:Cyclin-dependent protein kinase PHO85
Gene (Uniprot):PHO85
Chain IDs:A, C
Chain Length:317
Number of Molecules:2
Biological Source:Saccharomyces cerevisiae
Polymer Type:polypeptide(L)
Molecule:PHO85 cyclin PHO80
Gene (Uniprot):PHO80
Chain IDs:B, D
Chain Length:293
Number of Molecules:2
Biological Source:Saccharomyces cerevisiae
Primary Citation
Structure of the Pho85-Pho80 CDK-Cyclin Complex of the Phosphate-Responsive Signal Transduction Pathway
Mol.Cell 28 614 623 (2007)
PMID: 18042456 DOI: 10.1016/j.molcel.2007.09.013

Abstact

The ability to sense and respond appropriately to environmental changes is a primary requirement of all living organisms. In response to phosphate limitation, Saccharomyces cerevisiae induces transcription of a set of genes involved in the regulation of phosphate acquisition from the ambient environment. A signal transduction pathway (the PHO pathway) mediates this response, with Pho85-Pho80 playing a vital role. Here we report the X-ray structure of Pho85-Pho80, a prototypic structure of a CDK-cyclin complex functioning in transcriptional regulation in response to environmental changes. The structure revealed a specific salt link between a Pho85 arginine and a Pho80 aspartate that makes phosphorylation of the Pho85 activation loop dispensable and that maintains a Pho80 loop conformation for possible substrate recognition. It further showed two sites on the Pho80 cyclin for high-affinity binding of the transcription factor substrate (Pho4) and the CDK inhibitor (Pho81) that are markedly distant to each other and the active site.

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