9TB4 | pdb_00009tb4

SAM-dependent C6-FPP methytransferase from Streptomyces varsoviensis in complex with SAH and FPP

PDB DOI: https://doi.org/10.2210/pdb9TB4/pdb

Classification: TRANSFERASE
Organism(s): Streptomyces varsoviensis
Expression System: Escherichia coli BL21(DE3)
Mutation(s): No

Deposited: 2025-11-19 Released: 2026-01-28
Deposition Author(s): Li, H., Schnakenburg, G., Groll, M., Dickschat, J.S.
Funding Organization(s): German Research Foundation (DFG)

Experimental Data Snapshot

Method: X-RAY DIFFRACTION
Resolution: 2.20 Å
R-Value Free:
0.237 (Depositor), 0.237 (DCC)
R-Value Work:
0.209 (Depositor), 0.208 (DCC)
R-Value Observed:
0.210 (Depositor)

Starting Model: in silico
View more details

wwPDB Validation 3D Report Full Report

Ligand Structure Quality Assessment

This is version 1.2 of the entry. See complete history.

Literature

Structural Revision of the C 16 Sesquiterpene Hegelenether and the Mechanism of C6-Methylation in Terpene Biosynthesis.

Li, H., Schnakenburg, G., Groll, M., Dickschat, J.S.

(2026) Angew Chem Int Ed Engl 65: e25672-e25672

PubMed: 41540682 Search on PubMed
DOI: https://doi.org/10.1002/anie.202525672
Primary Citation Related Structures:
9TB4

PubMed Abstract:
Non-canonical methylation events generate terpene structures that evade classical biosynthetic predictions, as exemplified by the proposed C ₁₆ terpene hegelenether. Here, we show that this natural product is misassigned and revise its structure to the dihydroxylated sesquiterpenoid marxdiol. Its absolute configuration and that of its precursor prekantenol pyrophosphate were determined through terpene synthase-mediated incorporation of stereoselectively labeled probes. To explain the initiating C6 methylation, we solved the crystal structure of the methyltransferase C6-FPP-MT with SAH and FPP, revealing a compact aromatic pocket that enforces Si-face methylation and Glu165-mediated deprotonation. These insights define how the active site controls regio- and stereochemistry and provide a structural basis for identifying related methyl-modified terpenes in uncharacterized biosynthetic pathways.

Organizational Affiliation

Kekulé Institute of Organic Chemistry and Biochemistry, University of Bonn, Gerhard-Domagk-Straße 1, 53121, Bonn, Germany.

Macromolecule Content

Total Structure Weight: 410.03 kDa
Atom Count: 27,128
Modeled Residue Count: 3,292
Deposited Residue Count: 3,636
Unique protein chains: 1

Macromolecules

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| 3D Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
C6-FPP methytransferase	A, B, C, D, E A, B, C, D, E, F, G, H, I, J, K, L	303	Streptomyces varsoviensis	Mutation(s): 0

Small Molecules

Ligands 7 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram	3D Interactions
SAH (Subject of Investigation/LOI) Query on SAH Download:Ideal Coordinates CCD File SDF format, chain X [auth E] SDF format, chain WA [auth L] SDF format, chain V [auth D] SDF format, chain T [auth C] SDF format, chain RA [auth K] SDF format, chain QA [auth J] SDF format, chain P [auth B] SDF format, chain OA [auth I] SDF format, chain N [auth A] SDF format, chain LA [auth H] SDF format, chain KA [auth G] SDF format, chain GA [auth F] MOL2 format, chain X [auth E] MOL2 format, chain WA [auth L] MOL2 format, chain V [auth D] MOL2 format, chain T [auth C] MOL2 format, chain RA [auth K] MOL2 format, chain QA [auth J] MOL2 format, chain P [auth B] MOL2 format, chain OA [auth I] MOL2 format, chain N [auth A] MOL2 format, chain LA [auth H] MOL2 format, chain KA [auth G] MOL2 format, chain GA [auth F] mmCIF format, chain X [auth E] mmCIF format, chain WA [auth L] mmCIF format, chain V [auth D] mmCIF format, chain T [auth C] mmCIF format, chain RA [auth K] mmCIF format, chain QA [auth J] mmCIF format, chain P [auth B] mmCIF format, chain OA [auth I] mmCIF format, chain N [auth A] mmCIF format, chain LA [auth H] mmCIF format, chain KA [auth G] mmCIF format, chain GA [auth F]	GA [auth F] KA [auth G] LA [auth H] N [auth A] OA [auth I] GA [auth F], KA [auth G], LA [auth H], N [auth A], OA [auth I], P [auth B], QA [auth J], RA [auth K], T [auth C], V [auth D], WA [auth L], X [auth E]	S-ADENOSYL-L-HOMOCYSTEINE C₁₄ H₂₀ N₆ O₅ S ZJUKTBDSGOFHSH-WFMPWKQPSA-N		Interactions Focus chain GA [auth F] Focus chain KA [auth G] Focus chain LA [auth H] Focus chain N [auth A] Focus chain OA [auth I] Focus chain P [auth B] Focus chain QA [auth J] Focus chain RA [auth K] Focus chain T [auth C] Focus chain V [auth D] Focus chain WA [auth L] Focus chain X [auth E] Interactions & Density Focus chain GA [auth F] Focus chain KA [auth G] Focus chain LA [auth H] Focus chain N [auth A] Focus chain OA [auth I] Focus chain P [auth B] Focus chain QA [auth J] Focus chain RA [auth K] Focus chain T [auth C] Focus chain V [auth D] Focus chain WA [auth L] Focus chain X [auth E]
FPP (Subject of Investigation/LOI) Query on FPP Download:Ideal Coordinates CCD File SDF format, chain M [auth A] SDF format, chain JA [auth G] SDF format, chain FA [auth F] MOL2 format, chain M [auth A] MOL2 format, chain JA [auth G] MOL2 format, chain FA [auth F] mmCIF format, chain M [auth A] mmCIF format, chain JA [auth G] mmCIF format, chain FA [auth F]	FA [auth F], JA [auth G], M [auth A]	FARNESYL DIPHOSPHATE C₁₅ H₂₈ O₇ P₂ VWFJDQUYCIWHTN-YFVJMOTDSA-N		Interactions Focus chain FA [auth F] Focus chain JA [auth G] Focus chain M [auth A] Interactions & Density Focus chain FA [auth F] Focus chain JA [auth G] Focus chain M [auth A]
PE8 Query on PE8 Download:Ideal Coordinates CCD File SDF format, chain Y [auth E] MOL2 format, chain Y [auth E] mmCIF format, chain Y [auth E]	Y [auth E]	3,6,9,12,15,18,21-HEPTAOXATRICOSANE-1,23-DIOL C₁₆ H₃₄ O₉ GLZWNFNQMJAZGY-UHFFFAOYSA-N		Interactions Focus chain Y [auth E] Interactions & Density Focus chain Y [auth E]
PG4 Query on PG4 Download:Ideal Coordinates CCD File SDF format, chain Z [auth E] SDF format, chain Q [auth B] SDF format, chain O [auth A] SDF format, chain MA [auth H] SDF format, chain HA [auth F] SDF format, chain AA [auth E] MOL2 format, chain Z [auth E] MOL2 format, chain Q [auth B] MOL2 format, chain O [auth A] MOL2 format, chain MA [auth H] MOL2 format, chain HA [auth F] MOL2 format, chain AA [auth E] mmCIF format, chain Z [auth E] mmCIF format, chain Q [auth B] mmCIF format, chain O [auth A] mmCIF format, chain MA [auth H] mmCIF format, chain HA [auth F] mmCIF format, chain AA [auth E]	AA [auth E] HA [auth F] MA [auth H] O [auth A] Q [auth B] AA [auth E], HA [auth F], MA [auth H], O [auth A], Q [auth B], Z [auth E]	TETRAETHYLENE GLYCOL C₈ H₁₈ O₅ UWHCKJMYHZGTIT-UHFFFAOYSA-N		Interactions Focus chain AA [auth E] Focus chain HA [auth F] Focus chain MA [auth H] Focus chain O [auth A] Focus chain Q [auth B] Focus chain Z [auth E] Interactions & Density Focus chain AA [auth E] Focus chain HA [auth F] Focus chain MA [auth H] Focus chain O [auth A] Focus chain Q [auth B] Focus chain Z [auth E]
PGE Query on PGE Download:Ideal Coordinates CCD File SDF format, chain W [auth D] SDF format, chain U [auth C] SDF format, chain TA [auth K] SDF format, chain SA [auth K] SDF format, chain S [auth B] SDF format, chain R [auth B] SDF format, chain PA [auth I] SDF format, chain IA [auth F] MOL2 format, chain W [auth D] MOL2 format, chain U [auth C] MOL2 format, chain TA [auth K] MOL2 format, chain SA [auth K] MOL2 format, chain S [auth B] MOL2 format, chain R [auth B] MOL2 format, chain PA [auth I] MOL2 format, chain IA [auth F] mmCIF format, chain W [auth D] mmCIF format, chain U [auth C] mmCIF format, chain TA [auth K] mmCIF format, chain SA [auth K] mmCIF format, chain S [auth B] mmCIF format, chain R [auth B] mmCIF format, chain PA [auth I] mmCIF format, chain IA [auth F]	IA [auth F] PA [auth I] R [auth B] S [auth B] SA [auth K] IA [auth F], PA [auth I], R [auth B], S [auth B], SA [auth K], TA [auth K], U [auth C], W [auth D]	TRIETHYLENE GLYCOL C₆ H₁₄ O₄ ZIBGPFATKBEMQZ-UHFFFAOYSA-N		Interactions Focus chain IA [auth F] Focus chain PA [auth I] Focus chain R [auth B] Focus chain S [auth B] Focus chain SA [auth K] Focus chain TA [auth K] Focus chain U [auth C] Focus chain W [auth D] Interactions & Density Focus chain IA [auth F] Focus chain PA [auth I] Focus chain R [auth B] Focus chain S [auth B] Focus chain SA [auth K] Focus chain TA [auth K] Focus chain U [auth C] Focus chain W [auth D]
PEG Query on PEG Download:Ideal Coordinates CCD File SDF format, chain VA [auth K] SDF format, chain UA [auth K] SDF format, chain BA [auth E] MOL2 format, chain VA [auth K] MOL2 format, chain UA [auth K] MOL2 format, chain BA [auth E] mmCIF format, chain VA [auth K] mmCIF format, chain UA [auth K] mmCIF format, chain BA [auth E]	BA [auth E], UA [auth K], VA [auth K]	DI(HYDROXYETHYL)ETHER C₄ H₁₀ O₃ MTHSVFCYNBDYFN-UHFFFAOYSA-N		Interactions Focus chain BA [auth E] Focus chain UA [auth K] Focus chain VA [auth K] Interactions & Density Focus chain BA [auth E] Focus chain UA [auth K] Focus chain VA [auth K]
EDO Query on EDO Download:Ideal Coordinates CCD File SDF format, chain NA [auth H] SDF format, chain EA [auth E] SDF format, chain DA [auth E] SDF format, chain CA [auth E] MOL2 format, chain NA [auth H] MOL2 format, chain EA [auth E] MOL2 format, chain DA [auth E] MOL2 format, chain CA [auth E] mmCIF format, chain NA [auth H] mmCIF format, chain EA [auth E] mmCIF format, chain DA [auth E] mmCIF format, chain CA [auth E]	CA [auth E], DA [auth E], EA [auth E], NA [auth H]	1,2-ETHANEDIOL C₂ H₆ O₂ LYCAIKOWRPUZTN-UHFFFAOYSA-N		Interactions Focus chain CA [auth E] Focus chain DA [auth E] Focus chain EA [auth E] Focus chain NA [auth H] Interactions & Density Focus chain CA [auth E] Focus chain DA [auth E] Focus chain EA [auth E] Focus chain NA [auth H]