2BVJ

Ligand-free structure of cytochrome P450 PikC (CYP107L1)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.10 Å
  • R-Value Free: 0.243 
  • R-Value Work: 0.202 
  • R-Value Observed: 0.202 

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This is version 1.3 of the entry. See complete history


Literature

The Structural Basis for Substrate Anchoring, Active Site Selectivity, and Product Formation by P450 Pikc from Streptomyces Venezuelae.

Sherman, D.H.Li, S.Yermalitskaya, L.V.Kim, Y.Smith, J.A.Waterman, M.R.Podust, L.M.

(2006) J Biol Chem 281: 26289

  • DOI: https://doi.org/10.1074/jbc.M605478200
  • Primary Citation of Related Structures:  
    2BVJ, 2C6H, 2C7X, 2CD8

  • PubMed Abstract: 

    The pikromycin (Pik)/methymycin biosynthetic pathway of Streptomyces venezuelae represents a valuable system for dissecting the fundamental mechanisms of modular polyketide biosynthesis, aminodeoxysugar assembly, glycosyltransfer, and hydroxylation leading to the production of a series of macrolide antibiotics, including the natural ketolides narbomycin and pikromycin. In this study, we describe four x-ray crystal structures and allied functional studies for PikC, the remarkable P450 monooxygenase responsible for production of a number of related macrolide products from the Pik pathway. The results provide important new insights into the structural basis for the C10/C12 and C12/C14 hydroxylation patterns for the 12-(YC-17) and 14-membered ring (narbomycin) macrolides, respectively. This includes two different ligand-free structures in an asymmetric unit (resolution 2.1 A) and two co-crystal structures with bound endogenous substrates YC-17 (resolution 2.35 A)or narbomycin (resolution 1.7 A). A central feature of the enzyme-substrate interaction involves anchoring of the desosamine residue in two alternative binding pockets based on a series of distinct amino acid residues that form a salt bridge and a hydrogen-bonding network with the deoxysugar C3' dimethylamino group. Functional significance of the salt bridge was corroborated by site-directed mutagenesis that revealed a key role for Glu-94 in YC-17 binding and Glu-85 for narbomycin binding. Taken together, the x-ray structure analysis, site-directed mutagenesis, and corresponding product distribution studies reveal that PikC substrate tolerance and product diversity result from a combination of alternative anchoring modes rather than an induced fit mechanism.


  • Organizational Affiliation

    Life Sciences Institute and Department of Medicinal Chemistry, University of Michigan, Ann Arbor, Michigan, 48109, USA. davidhs@umich.edu


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
CYTOCHROME P450 MONOOXYGENASE
A, B
436Streptomyces venezuelaeMutation(s): 0 
UniProt
Find proteins for O87605 (Streptomyces venezuelae)
Explore O87605 
Go to UniProtKB:  O87605
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO87605
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.10 Å
  • R-Value Free: 0.243 
  • R-Value Work: 0.202 
  • R-Value Observed: 0.202 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 218.19α = 90
b = 64.171β = 107.15
c = 73.593γ = 90
Software Package:
Software NamePurpose
CNSrefinement
HKL-2000data reduction
SCALEPACKdata scaling
CNSphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2006-07-03
    Type: Initial release
  • Version 1.1: 2011-05-08
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2023-12-13
    Changes: Data collection, Database references, Derived calculations, Other, Refinement description