5GM1

Crystal structure of methyltransferase TleD complexed with SAH


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.501 Å
  • R-Value Free: 0.248 
  • R-Value Work: 0.207 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Crystal structure and enantioselectivity of terpene cyclization in SAM-dependent methyltransferase TleD

Yu, F.Li, M.J.Xu, C.Y.Sun, B.Zhou, H.Wang, Z.J.Xu, Q.Xie, M.Y.Zuo, G.Huang, P.Guo, H.Wang, Q.S.He, J.H.

(2016) Biochem.J. 473: 4385-4397

  • DOI: 10.1042/BCJ20160695
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • TleD is a SAM (S-adenosyl-l-methionine)-dependent methyltransferase and acts as one of the key enzymes in the teleocidin B biosynthesis pathway. Besides methyl transferring, TleD also rearranges the geranyl and indole moieties of the precursor to for ...

    TleD is a SAM (S-adenosyl-l-methionine)-dependent methyltransferase and acts as one of the key enzymes in the teleocidin B biosynthesis pathway. Besides methyl transferring, TleD also rearranges the geranyl and indole moieties of the precursor to form a six-membered ring. Moreover, it does not show homologies with any known terpenoid cyclases. In order to elucidate how such a remarkable reaction could be achieved, we determined the complex crystal structures of TleD and the cofactor analogue S-adenosyl-l-homocysteine with or without the substrate teleocidin A1. A domain-swapped pattern via an additional N-terminal α-helix is observed in TleD hexamers. Structural comparison and alignment shows that this additional N-terminal α-helix is the common feature of SAM methyltransferase-like cyclases TleD and SpnF. The residue Tyr21 anchors the additional N-terminal α-helix to a 'core SAM-MT fold' and is a key residue for catalytic activity. Molecular dynamics simulation results suggest that the dihedral angle C23-C24-C25-C26 of teleocidin A1 is preferred to 60-90° in the TleD and substrate complex structure, which tend to adopt a Re-face stereocenter at C25 position after reaction and is according to in vitro enzyme reaction experiments. Our results also demonstrate that methyl transfer can be a new chemical strategy for carbocation formation in the terpene cyclization, which is the key initial step.


    Organizational Affiliation

    Shanghai Institute of Applied Physics, Chinese Academy of Sciences, 239 Zhang Heng Road, Pudong New District, Shanghai 201203, P.R. China.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
O-methylransferase
A, B, C, D, E, F, G, H, I, J, K, L, M, N, O, P, Q, R
297Streptomyces blastmyceticusMutation(s): 0 
Gene Names: tleD
Find proteins for A0A077K7L1 (Streptomyces blastmyceticus)
Go to UniProtKB:  A0A077K7L1
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
SAH
Query on SAH

Download SDF File 
Download CCD File 
A, B, C, D, E, F, G, H, I, J, K, L, M, N, O, P, Q, R
S-ADENOSYL-L-HOMOCYSTEINE
C14 H20 N6 O5 S
ZJUKTBDSGOFHSH-WFMPWKQPSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.501 Å
  • R-Value Free: 0.248 
  • R-Value Work: 0.207 
  • Space Group: C 1 2 1
Unit Cell:
Length (Å)Angle (°)
a = 259.621α = 90.00
b = 152.902β = 93.33
c = 154.793γ = 90.00
Software Package:
Software NamePurpose
Aimlessdata scaling
XDSdata reduction
PHENIXrefinement
PHASERphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Natural Science FoundationChina31570740

Revision History 

  • Version 1.0: 2016-09-28
    Type: Initial release
  • Version 1.1: 2016-12-07
    Type: Database references