2.1 Angstrom structure of ActVI-ORFA from Streptomyces Coelicolor

Experimental Data Snapshot

  • Resolution: 2.11 Å
  • R-Value Free: 0.247 
  • R-Value Work: 0.224 
  • R-Value Observed: 0.225 

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This is version 1.2 of the entry. See complete history


Structural characterization of three noncanonical NTF2-like superfamily proteins: implications for polyketide biosynthesis.

Vuksanovic, N.Zhu, X.Serrano, D.A.Siitonen, V.Metsa-Ketela, M.Melancon 3rd, C.E.Silvaggi, N.R.

(2020) Acta Crystallogr F Struct Biol Commun 76: 372-383

  • DOI: https://doi.org/10.1107/S2053230X20009814
  • Primary Citation of Related Structures:  
    5BKA, 6P77, 6P7L, 6VW4

  • PubMed Abstract: 

    Proteins belonging to the NTF2-like superfamily are present in the biosynthetic pathways of numerous polyketide natural products, such as anthracyclins and benzoisochromanequinones. Some have been found to be bona fide polyketide cyclases, but many of them have roles that are currently unknown. Here, the X-ray crystal structures of three NTF2-like proteins of unknown function are reported: those of ActVI-ORFA from Streptomyces coelicolor A3(2) and its homologs Caci_6494, a protein from an uncharacterized biosynthetic cluster in Catenulispora acidiphila, and Aln2 from Streptomyces sp. CM020, a protein in the biosynthetic pathway of alnumycin. The presence of a solvent-accessible cavity and the conservation of the His/Asp dyad that is characteristic of many polyketide cyclases suggest a potential enzymatic role for these enzymes in polyketide biosynthesis.

  • Organizational Affiliation

    Department of Chemistry and Biochemistry, University of Wisconsin-Milwaukee, 3210 North Cramer Street, Milwaukee, WI 53211, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Hydroxylacyl-CoA dehydrogenase
A, B, C, D, E
A, B, C, D, E, F
146Streptomyces coelicolor A3(2)Mutation(s): 0 
Gene Names: SCO5071
Find proteins for Q7AKI2 (Streptomyces coelicolor (strain ATCC BAA-471 / A3(2) / M145))
Explore Q7AKI2 
Go to UniProtKB:  Q7AKI2
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ7AKI2
Sequence Annotations
  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChains TypeFormula2D DiagramParent
Query on MSE
A, B, C, D, E
A, B, C, D, E, F
Experimental Data & Validation

Experimental Data

  • Resolution: 2.11 Å
  • R-Value Free: 0.247 
  • R-Value Work: 0.224 
  • R-Value Observed: 0.225 
  • Space Group: P 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 82.266α = 90
b = 52.916β = 104.33
c = 98.931γ = 90
Software Package:
Software NamePurpose
HKL-3000data reduction
HKL-3000data scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2020-06-03
    Type: Initial release
  • Version 1.1: 2020-06-17
    Changes: Database references, Structure summary
  • Version 1.2: 2020-09-02
    Changes: Database references