9TH3 | pdb_00009th3

Guanidine prenyltransferase NosH in complex with FSPP, guanidine and Mg2+

PDB DOI: https://doi.org/10.2210/pdb9TH3/pdb

Classification: TRANSFERASE
Organism(s): Nostoc flagelliforme CCNUN1
Expression System: Escherichia coli
Mutation(s): No

Deposited: 2025-12-02 Released: 2026-11-04
Deposition Author(s): Kolling, D., Koehnke, J.
Funding Organization(s): Other government

Experimental Data Snapshot

Method: X-RAY DIFFRACTION
Resolution: 2.10 Å
R-Value Free:
0.202 (Depositor), 0.202 (DCC)
R-Value Work:
0.175 (Depositor), 0.179 (DCC)
R-Value Observed:
0.177 (Depositor)

Starting Model: in silico
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wwPDB Validation 3D Report Full Report

Ligand Structure Quality Assessment

This is version 1.0 of the entry. See complete history.

Literature

Natural product biosynthesis by guanidine prenyltransferases in plants and bacteria.

Kolling, D., Konzok, K., Taser, D., Jentsch, T., Schwoerer, S., Struwe, H., Bultemeier, A., Freiberg, J., Witte, C.P., Franke, J., Luzhetskyy, A., Kirschning, A., Rudorf, S., Koehnke, J.

(2026) Science 394: 413-418

PubMed: 42912132 Search on PubMed
DOI: https://doi.org/10.1126/science.aeg1821
Primary Citation Related Structures:
31KA, 9TGV, 9TGX, 9TGZ, 9TH3

PubMed Abstract:
Guanidine exists almost exclusively as a resonance-stabilized cation, making its direct enzymatic functionalization challenging. We identified the cyanobacterial enzyme NosH, which catalyzes direct prenyl transfer to free guanidine. Structural and mechanistic analyses revealed guanidine activation by a two-aspartate clamp coupled to prenyl-donor binding through a distinct catalytic architecture. Guided by these features, we identified a large family of guanidine prenyltransferases across bacteria and plants. Plant enzymes produced guanidine alkaloids such as galegine in vitro and heterologous expression of a plant ortholog in Nicotiana benthamiana produced galegine in planta, providing a direct enzymatic link to plant-specialized metabolism.

Organizational Affiliation

Institute of Food Chemistry, Leibniz University Hannover, Hannover, Germany.

Macromolecule Content

Total Structure Weight: 60.47 kDa
Atom Count: 4,248
Modeled Residue Count: 475
Deposited Residue Count: 516
Unique protein chains: 1

Macromolecules

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| 3D Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
NosH	A, B	258	Nostoc flagelliforme CCNUN1	Mutation(s): 0 Gene Names: COO91_01263
UniProt
Find proteins for A0A2K8SKL8 (Nostoc flagelliforme CCNUN1) Explore A0A2K8SKL8 Go to UniProtKB: A0A2K8SKL8
Entity Groups
Sequence Clusters	30% Identity 50% Identity 70% Identity 90% Identity 95% Identity 100% Identity
UniProt Group	A0A2K8SKL8
Sequence Annotations Expand
Reference Sequence

Small Molecules

Ligands 3 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram	3D Interactions
FPS (Subject of Investigation/LOI) Query on FPS Download:Ideal Coordinates CCD File SDF format, chain D [auth A] SDF format, chain H [auth B] MOL2 format, chain D [auth A] MOL2 format, chain H [auth B] mmCIF format, chain D [auth A] mmCIF format, chain H [auth B]	D [auth A], H [auth B]	S-[(2E,6E)-3,7,11-TRIMETHYLDODECA-2,6,10-TRIENYL] TRIHYDROGEN THIODIPHOSPHATE C₁₅ H₂₈ O₆ P₂ S MYMLCRQRXFRQGP-YFVJMOTDSA-N		Interactions Focus chain D [auth A] Focus chain H [auth B] Interactions & Density Focus chain D [auth A] Focus chain H [auth B]
GAI (Subject of Investigation/LOI) Query on GAI Download:Ideal Coordinates CCD File SDF format, chain C [auth A] SDF format, chain G [auth B] MOL2 format, chain C [auth A] MOL2 format, chain G [auth B] mmCIF format, chain C [auth A] mmCIF format, chain G [auth B]	C [auth A], G [auth B]	GUANIDINE C H₅ N₃ ZRALSGWEFCBTJO-UHFFFAOYSA-N		Interactions Focus chain C [auth A] Focus chain G [auth B] Interactions & Density Focus chain C [auth A] Focus chain G [auth B]
MG Query on MG Download:Ideal Coordinates CCD File SDF format, chain E [auth A] SDF format, chain F [auth A] SDF format, chain I [auth B] SDF format, chain J [auth B] MOL2 format, chain E [auth A] MOL2 format, chain F [auth A] MOL2 format, chain I [auth B] MOL2 format, chain J [auth B] mmCIF format, chain E [auth A] mmCIF format, chain F [auth A] mmCIF format, chain I [auth B] mmCIF format, chain J [auth B]	E [auth A], F [auth A], I [auth B], J [auth B]	MAGNESIUM ION Mg JLVVSXFLKOJNIY-UHFFFAOYSA-N		Interactions Focus chain E [auth A] Focus chain F [auth A] Focus chain I [auth B] Focus chain J [auth B] Interactions & Density Focus chain E [auth A] Focus chain F [auth A] Focus chain I [auth B] Focus chain J [auth B]