Crystal structure of geranyl diphosphate C-methyltransferase from Streptomyces coelicolor A3(2) in complex with Mg2+, geranyl-S-thiolodiphosphate, and S-adenosyl-L-homocysteine

Experimental Data Snapshot

  • Resolution: 1.82 Å
  • R-Value Free: 0.194 
  • R-Value Work: 0.167 
  • R-Value Observed: 0.167 

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Structure of Geranyl Diphosphate C-Methyltransferase from Streptomyces coelicolor and Implications for the Mechanism of Isoprenoid Modification.

Koksal, M.Chou, W.K.Cane, D.E.Christianson, D.W.

(2012) Biochemistry 51: 3003-3010

  • DOI: https://doi.org/10.1021/bi300109c
  • Primary Citation of Related Structures:  
    3VC1, 3VC2

  • PubMed Abstract: 

    Geranyl diphosphate C-methyltransferase (GPPMT) from Streptomyces coelicolor A3(2) is the first methyltransferase discovered that modifies an acyclic isoprenoid diphosphate, geranyl diphosphate (GPP), to yield a noncanonical acyclic allylic diphosphate product, 2-methylgeranyl diphosphate, which serves as the substrate for a subsequent cyclization reaction catalyzed by a terpenoid cyclase, methylisoborneol synthase. Here, we report the crystal structures of GPPMT in complex with GPP or the substrate analogue geranyl S-thiolodiphosphate (GSPP) along with S-adenosyl-L-homocysteine in the cofactor binding site, resulting from in situ demethylation of S-adenosyl-L-methionine, at 2.05 or 1.82 Å resolution, respectively. These structures suggest that both GPP and GSPP can undergo catalytic methylation in crystalline GPPMT, followed by dissociation of the isoprenoid product. S-Adenosyl-L-homocysteine remains bound in the active site, however, and does not exchange with a fresh molecule of cofactor S-adenosyl-L-methionine. These structures provide important clues about the molecular mechanism of the reaction, especially with regard to the face of the 2,3 double bond of GPP that is methylated as well as the stabilization of the resulting carbocation intermediate through cation-π interactions.

  • Organizational Affiliation

    Roy and Diana Vagelos Laboratories, Department of Chemistry, University of Pennsylvania, 231 South 34th Street, Philadelphia, Pennsylvania 19104-6323, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Geranyl diphosphate 2-C-methyltransferase
A, B, C, D, E
A, B, C, D, E, F, G, H, I, J, K, L
312Streptomyces coelicolor A3(2)Mutation(s): 0 
Gene Names: orf4SCBAC12C8.02SCO7701
EC: 2.1.1
Find proteins for Q9F1Y5 (Streptomyces coelicolor (strain ATCC BAA-471 / A3(2) / M145))
Explore Q9F1Y5 
Go to UniProtKB:  Q9F1Y5
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9F1Y5
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 5 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on SAH

Download Ideal Coordinates CCD File 
CA [auth D]
CB [auth J]
GA [auth E]
GB [auth K]
JB [auth L]
CA [auth D],
CB [auth J],
GA [auth E],
GB [auth K],
JB [auth L],
MA [auth F],
N [auth A],
QA [auth G],
T [auth B],
UA [auth H],
X [auth C],
YA [auth I]
C14 H20 N6 O5 S
Query on GST

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DA [auth D]
DB [auth J]
HA [auth E]
HB [auth K]
KB [auth L]
DA [auth D],
DB [auth J],
HA [auth E],
HB [auth K],
KB [auth L],
NA [auth F],
O [auth A],
RA [auth G],
U [auth B],
VA [auth H],
Y [auth C],
ZA [auth I]
C10 H20 O6 P2 S
Query on SO4

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O4 S
Query on GOL

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AA [auth C]
AB [auth I]
EA [auth D]
EB [auth J]
JA [auth E]
AA [auth C],
AB [auth I],
EA [auth D],
EB [auth J],
JA [auth E],
KA [auth E],
LB [auth L],
OA [auth F],
P [auth A],
Q [auth A],
R [auth A],
SA [auth G],
V [auth B],
WA [auth H],
Z [auth C]
C3 H8 O3
Query on MG

Download Ideal Coordinates CCD File 
BA [auth D]
BB [auth J]
FA [auth E]
FB [auth K]
IB [auth L]
BA [auth D],
BB [auth J],
FA [auth E],
FB [auth K],
IB [auth L],
LA [auth F],
M [auth A],
PA [auth G],
S [auth B],
TA [auth H],
W [auth C],
XA [auth I]
Experimental Data & Validation

Experimental Data

  • Resolution: 1.82 Å
  • R-Value Free: 0.194 
  • R-Value Work: 0.167 
  • R-Value Observed: 0.167 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 97.029α = 90
b = 102.903β = 99.59
c = 203.582γ = 90
Software Package:
Software NamePurpose
CBASSdata collection
HKL2Mapmodel building
HKL-2000data reduction
HKL-2000data 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: 2012-04-11
    Type: Initial release
  • Version 1.1: 2012-04-25
    Changes: Database references
  • Version 1.2: 2017-11-08
    Changes: Refinement description
  • Version 1.3: 2024-02-28
    Changes: Data collection, Database references, Derived calculations