Crystal structure of TleB apo

Experimental Data Snapshot

  • Resolution: 2.20 Å
  • R-Value Free: 0.236 
  • R-Value Work: 0.168 
  • R-Value Observed: 0.175 

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Molecular basis for the P450-catalyzed C-N bond formation in indolactam biosynthesis.

He, F.Mori, T.Morita, I.Nakamura, H.Alblova, M.Hoshino, S.Awakawa, T.Abe, I.

(2019) Nat Chem Biol 15: 1206-1213

  • DOI: https://doi.org/10.1038/s41589-019-0380-9
  • Primary Citation of Related Structures:  
    6J82, 6J83, 6J84, 6J85, 6J86, 6J87, 6J88

  • PubMed Abstract: 

    The catalytic versatility of cytochrome P450 monooxygenases is remarkable. Here, we present mechanistic and structural characterizations of TleB from Streptomyces blastmyceticus and its homolog HinD from Streptoalloteichus hindustanus, which catalyze unusual intramolecular C-N bond formation to generate indolactam V from the dipeptide N-methylvalyl-tryptophanol. In vitro analyses demonstrated that both P450s exhibit promiscuous substrate specificity, and modification of the N13-methyl group resulted in the formation of indole-fused 6/5/6 tricyclic products. Furthermore, X-ray crystal structures in complex with substrates and structure-based mutagenesis revealed the intimate structural details of the enzyme reactions. We propose that the generation of a diradical species is critical for the indolactam formation, and that the intramolecular C(sp 2 )-H amination is initiated by the abstraction of the N1 indole hydrogen. After indole radical repositioning and subsequent removal of the N13 hydrogen, the coupling of the properly-folded diradical leads to the formation of the C4-N13 bond of indolactam.

  • Organizational Affiliation

    Graduate School of Pharmaceutical Sciences, The University of Tokyo, Tokyo, Japan.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Cytochrome P-450418Streptomyces blastmyceticusMutation(s): 0 
Gene Names: tleB
Find proteins for A0A077KEB8 (Streptomyces blastmyceticus)
Explore A0A077KEB8 
Go to UniProtKB:  A0A077KEB8
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupA0A077KEB8
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on HEM

Download Ideal Coordinates CCD File 
C34 H32 Fe N4 O4
Experimental Data & Validation

Experimental Data

  • Resolution: 2.20 Å
  • R-Value Free: 0.236 
  • R-Value Work: 0.168 
  • R-Value Observed: 0.175 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 39.712α = 90
b = 84.758β = 90
c = 113.124γ = 90
Software Package:
Software NamePurpose
XDSdata reduction
Aimlessdata scaling

Structure Validation

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Ligand Structure Quality Assessment 

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2019-08-07
    Type: Initial release
  • Version 1.1: 2021-02-17
    Changes: Database references
  • Version 1.2: 2023-11-22
    Changes: Data collection, Database references, Refinement description