Human Casein Kinase 1 delta Tau mutant (R178C)

Experimental Data Snapshot

  • Resolution: 1.55 Å
  • R-Value Free: 0.205 
  • R-Value Work: 0.177 
  • R-Value Observed: 0.178 

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Casein kinase 1 dynamics underlie substrate selectivity and the PER2 circadian phosphoswitch.

Philpott, J.M.Narasimamurthy, R.Ricci, C.G.Freeberg, A.M.Hunt, S.R.Yee, L.E.Pelofsky, R.S.Tripathi, S.Virshup, D.M.Partch, C.L.

(2020) Elife 9

  • DOI: https://doi.org/10.7554/eLife.52343
  • Primary Citation of Related Structures:  
    6PXN, 6PXO, 6PXP

  • PubMed Abstract: 

    Post-translational control of PERIOD stability by Casein Kinase 1δ and ε (CK1) plays a key regulatory role in metazoan circadian rhythms. Despite the deep evolutionary conservation of CK1 in eukaryotes, little is known about its regulation and the factors that influence substrate selectivity on functionally antagonistic sites in PERIOD that directly control circadian period. Here we describe a molecular switch involving a highly conserved anion binding site in CK1. This switch controls conformation of the kinase activation loop and determines which sites on mammalian PER2 are preferentially phosphorylated, thereby directly regulating PER2 stability. Integrated experimental and computational studies shed light on the allosteric linkage between two anion binding sites that dynamically regulate kinase activity. We show that period-altering kinase mutations from humans to Drosophila differentially modulate this activation loop switch to elicit predictable changes in PER2 stability, providing a foundation to understand and further manipulate CK1 regulation of circadian rhythms.

  • Organizational Affiliation

    Department of Chemistry and Biochemistry, University of California Santa Cruz, Santa Cruz, United States.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Casein kinase I isoform delta
A, B
415Homo sapiensMutation(s): 1 
EC: (PDB Primary Data), (PDB Primary Data)
UniProt & NIH Common Fund Data Resources
Find proteins for P48730 (Homo sapiens)
Explore P48730 
Go to UniProtKB:  P48730
PHAROS:  P48730
GTEx:  ENSG00000141551 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP48730
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.55 Å
  • R-Value Free: 0.205 
  • R-Value Work: 0.177 
  • R-Value Observed: 0.178 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 50.081α = 90
b = 129.64β = 113.41
c = 51.86γ = 90
Software Package:
Software NamePurpose
iMOSFLMdata reduction
Aimlessdata scaling

Structure Validation

View Full Validation Report

Ligand Structure Quality Assessment 

Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United States--

Revision History  (Full details and data files)

  • Version 1.0: 2020-02-12
    Type: Initial release
  • Version 1.1: 2020-08-26
    Changes: Database references
  • Version 1.2: 2023-10-11
    Changes: Data collection, Database references, Refinement description