Crystal structure of photoactivated adenylyl cyclase of a cyanobacteriaOscillatoria acuminata in hexagonal form

Experimental Data Snapshot

  • Resolution: 1.80 Å
  • R-Value Free: 0.264 
  • R-Value Work: 0.212 
  • R-Value Observed: 0.215 

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This is version 1.3 of the entry. See complete history


Structural insight into photoactivation of an adenylate cyclase from a photosynthetic cyanobacterium

Ohki, M.Sugiyama, K.Kawai, F.Tanaka, H.Nihei, Y.Unzai, S.Takebe, M.Matsunaga, S.Adachi, S.Shibayama, N.Zhou, Z.Koyama, R.Ikegaya, Y.Takahashi, T.Tame, J.R.H.Iseki, M.Park, S.-Y.

(2016) Proc Natl Acad Sci U S A 113: 6659-6664

  • DOI: https://doi.org/10.1073/pnas.1517520113
  • Primary Citation of Related Structures:  
    4YUS, 4YUT

  • PubMed Abstract: 

    Cyclic-AMP is one of the most important second messengers, regulating many crucial cellular events in both prokaryotes and eukaryotes, and precise spatial and temporal control of cAMP levels by light shows great promise as a simple means of manipulating and studying numerous cell pathways and processes. The photoactivated adenylate cyclase (PAC) from the photosynthetic cyanobacterium Oscillatoria acuminata (OaPAC) is a small homodimer eminently suitable for this task, requiring only a simple flavin chromophore within a blue light using flavin (BLUF) domain. These domains, one of the most studied types of biological photoreceptor, respond to blue light and either regulate the activity of an attached enzyme domain or change its affinity for a repressor protein. BLUF domains were discovered through studies of photo-induced movements of Euglena gracilis, a unicellular flagellate, and gene expression in the purple bacterium Rhodobacter sphaeroides, but the precise details of light activation remain unknown. Here, we describe crystal structures and the light regulation mechanism of the previously undescribed OaPAC, showing a central coiled coil transmits changes from the light-sensing domains to the active sites with minimal structural rearrangement. Site-directed mutants show residues essential for signal transduction over 45 Å across the protein. The use of the protein in living human cells is demonstrated with cAMP-dependent luciferase, showing a rapid and stable response to light over many hours and activation cycles. The structures determined in this study will assist future efforts to create artificial light-regulated control modules as part of a general optogenetic toolkit.

  • Organizational Affiliation

    Laboratory of Chemical Pharmacology, Graduate School of Pharmaceutical Sciences, The University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Family 3 adenylate cyclase382Oscillatoria acuminata PCC 6304Mutation(s): 0 
Gene Names: Oscil6304_3613
Find proteins for K9TLZ5 (Oscillatoria acuminata PCC 6304)
Explore K9TLZ5 
Go to UniProtKB:  K9TLZ5
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupK9TLZ5
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on FMN

Download Ideal Coordinates CCD File 
C17 H21 N4 O9 P
Experimental Data & Validation

Experimental Data

  • Resolution: 1.80 Å
  • R-Value Free: 0.264 
  • R-Value Work: 0.212 
  • R-Value Observed: 0.215 
  • Space Group: P 61 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 76.838α = 90
b = 76.838β = 90
c = 204.778γ = 120
Software Package:
Software NamePurpose
HKL-2000data scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2016-06-01
    Type: Initial release
  • Version 1.1: 2016-06-15
    Changes: Database references
  • Version 1.2: 2016-06-29
    Changes: Database references
  • Version 1.3: 2020-02-05
    Changes: Data collection, Derived calculations