6AL7

Crystal structure HpiC1 F138S


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.687 Å
  • R-Value Free: 0.253 
  • R-Value Work: 0.223 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Structural basis of the Cope rearrangement and cyclization in hapalindole biogenesis.

Newmister, S.A.Li, S.Garcia-Borras, M.Sanders, J.N.Yang, S.Lowell, A.N.Yu, F.Smith, J.L.Williams, R.M.Houk, K.N.Sherman, D.H.

(2018) Nat. Chem. Biol. 14: 345-351

  • DOI: 10.1038/s41589-018-0003-x
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Hapalindole alkaloids are a structurally diverse class of cyanobacterial natural products defined by their varied polycyclic ring systems and diverse biological activities. These complex metabolites are generated from a common biosynthetic intermedia ...

    Hapalindole alkaloids are a structurally diverse class of cyanobacterial natural products defined by their varied polycyclic ring systems and diverse biological activities. These complex metabolites are generated from a common biosynthetic intermediate by the Stig cyclases in three mechanistic steps: a rare Cope rearrangement, 6-exo-trig cyclization, and electrophilic aromatic substitution. Here we report the structure of HpiC1, a Stig cyclase that catalyzes the formation of 12-epi-hapalindole U in vitro. The 1.5-Å structure revealed a dimeric assembly with two calcium ions per monomer and with the active sites located at the distal ends of the protein dimer. Mutational analysis and computational methods uncovered key residues for an acid-catalyzed [3,3]-sigmatropic rearrangement, as well as specific determinants that control the position of terminal electrophilic aromatic substitution, leading to a switch from hapalindole to fischerindole alkaloids.


    Organizational Affiliation

    Life Sciences Institute, University of Michigan, Ann Arbor, MI, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
12-epi-hapalindole C/U synthase
A, B, D, E
225Fischerella sp. ATCC 43239Mutation(s): 1 
Gene Names: hpiU5
Find proteins for A0A076NBW8 (Fischerella sp. ATCC 43239)
Go to UniProtKB:  A0A076NBW8
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CA
Query on CA

Download SDF File 
Download CCD File 
A, B, D, E
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.687 Å
  • R-Value Free: 0.253 
  • R-Value Work: 0.223 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 62.053α = 90.00
b = 47.939β = 97.19
c = 174.256γ = 90.00
Software Package:
Software NamePurpose
PDB_EXTRACTdata extraction
Cootmodel building
XSCALEdata scaling
XDSdata reduction
PHENIXrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


Funding OrganizationCountryGrant Number
National Science Foundation (United States)United StatesCHE-1205646
National Institutes of HealthUnited StatesCA70375
National Institutes of HealthUnited StatesR35 GM118101
National Institutes of HealthUnited StatesR01 GM076477
National Science Foundation (United States)United StatesOCI-1053575

Revision History 

  • Version 1.0: 2018-03-07
    Type: Initial release
  • Version 1.1: 2018-03-28
    Type: Data collection, Database references
  • Version 1.2: 2018-04-04
    Type: Data collection, Database references