4FPW

Crystal Structure of CalU16 from Micromonospora echinospora. Northeast Structural Genomics Consortium Target MiR12.


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.5 Å
  • R-Value Free: 0.282 
  • R-Value Work: 0.241 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Structure-Guided Functional Characterization of Enediyne Self-Sacrifice Resistance Proteins, CalU16 and CalU19.

Elshahawi, S.I.Ramelot, T.A.Seetharaman, J.Chen, J.Singh, S.Yang, Y.Pederson, K.Kharel, M.K.Xiao, R.Lew, S.Yennamalli, R.M.Miller, M.D.Wang, F.Tong, L.Montelione, G.T.Kennedy, M.A.Bingman, C.A.Zhu, H.Phillips, G.N.Thorson, J.S.

(2014) Acs Chem.Biol. 9: 2347-2358

  • DOI: 10.1021/cb500327m
  • Primary Citation of Related Structures:  2LUZ

  • PubMed Abstract: 
  • Calicheamicin γ1I (1) is an enediyne antitumor compound produced by Micromonospora echinospora spp. calichensis, and its biosynthetic gene cluster has been previously reported. Despite extensive analysis and biochemical study, several genes in the bi ...

    Calicheamicin γ1I (1) is an enediyne antitumor compound produced by Micromonospora echinospora spp. calichensis, and its biosynthetic gene cluster has been previously reported. Despite extensive analysis and biochemical study, several genes in the biosynthetic gene cluster of 1 remain functionally unassigned. Using a structural genomics approach and biochemical characterization, two proteins encoded by genes from the 1 biosynthetic gene cluster assigned as "unknowns", CalU16 and CalU19, were characterized. Structure analysis revealed that they possess the STeroidogenic Acute Regulatory protein related lipid Transfer (START) domain known mainly to bind and transport lipids and previously identified as the structural signature of the enediyne self-resistance protein CalC. Subsequent study revealed calU16 and calU19 to confer resistance to 1, and reminiscent of the prototype CalC, both CalU16 and CalU19 were cleaved by 1 in vitro. Through site-directed mutagenesis and mass spectrometry, we identified the site of cleavage in each protein and characterized their function in conferring resistance against 1. This report emphasizes the importance of structural genomics as a powerful tool for the functional annotation of unknown proteins.


    Organizational Affiliation

    Department of Pharmaceutical Sciences, College of Pharmacy, University of Kentucky , Lexington, Kentucky 40536, United States.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
CalU16
A, B
181Micromonospora echinosporaGene Names: calU16
Find proteins for Q8KNE9 (Micromonospora echinospora)
Go to UniProtKB:  Q8KNE9
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
MSE
Query on MSE
A, B
L-PEPTIDE LINKINGC5 H11 N O2 SeMET
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.5 Å
  • R-Value Free: 0.282 
  • R-Value Work: 0.241 
  • Space Group: P 61
Unit Cell:
Length (Å)Angle (°)
a = 51.852α = 90.00
b = 51.852β = 90.00
c = 305.705γ = 120.00
Software Package:
Software NamePurpose
HKL-2000data reduction
ADSCdata collection
HKL-2000data scaling
SHELXSphasing
REFMACrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Revision History 

  • Version 1.0: 2012-12-12
    Type: Initial release
  • Version 1.1: 2014-11-12
    Type: Database references