37CY | pdb_000037cy

Cryo-EM structure of Nitrogenase MoFe protein from Methanosarcina acetivorans bound to the NifI inhibitor complex in strictly anaerobic condition

PDB DOI: https://doi.org/10.2210/pdb37CY/pdb
EM Map EMD-78079: EMDB EMDataResource

Classification: OXIDOREDUCTASE
Organism(s): Methanosarcina acetivorans
Expression System: Methanosarcina acetivorans
Mutation(s): No

Deposited: 2026-07-14 Released: 2026-09-23
Deposition Author(s): Kashyap, R., Antony, E.
Funding Organization(s): Department of Energy (DOE, United States)

Experimental Data Snapshot

Method: ELECTRON MICROSCOPY
Resolution: 3.80 Å
Aggregation State: PARTICLE
Reconstruction Method: SINGLE PARTICLE

Starting Model: experimental
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wwPDB Validation 3D Report Full Report

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

Literature

Cryo-EM structure of Nitrogenase MoFe protein from Methanosarcina acetivorans bound to the NifI inhibitor complex

Kashyap, R., Antony, E.

To be published.

Macromolecule Content

Total Structure Weight: 910.54 kDa
Atom Count: 58,733
Modeled Residue Count: 7,494
Deposited Residue Count: 8,100
Unique protein chains: 4

Macromolecules

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| 3D Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Nitrogenase protein alpha chain	A C E [auth K] G [auth V] P [auth L] A, C, E [auth K], G [auth V], P [auth L], R [auth U]	559	Methanosarcina acetivorans	Mutation(s): 0 Gene Names: nifD, MA_3898 EC: 1.18.6.1
UniProt
Find proteins for Q8TJ90 (Methanosarcina acetivorans (strain ATCC 35395 / DSM 2834 / JCM 12185 / C2A)) Explore Q8TJ90 Go to UniProtKB: Q8TJ90
Entity Groups
Sequence Clusters	30% Identity 50% Identity 70% Identity 90% Identity 95% Identity 100% Identity
UniProt Group	Q8TJ90
Sequence Annotations Expand
Reference Sequence

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| 3D Structure

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
Nitrogenase molybdenum-iron protein beta chain	B D F [auth M] H [auth W] I [auth X] B, D, F [auth M], H [auth W], I [auth X], Q [auth N]	456	Methanosarcina acetivorans	Mutation(s): 0 EC: 1.18.6.1
UniProt
Find proteins for Q8TJ89 (Methanosarcina acetivorans (strain ATCC 35395 / DSM 2834 / JCM 12185 / C2A)) Explore Q8TJ89 Go to UniProtKB: Q8TJ89
Entity Groups
Sequence Clusters	30% Identity 50% Identity 70% Identity 90% Identity 95% Identity 100% Identity
UniProt Group	Q8TJ89
Sequence Annotations Expand
Reference Sequence

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| 3D Structure

Entity ID: 3
Molecule	Chains	Sequence Length	Organism	Details	Image
P-II family nitrogen regulatory protein	CA [auth Z] DA [auth c] J [auth H] K [auth J] L [auth R] CA [auth Z], DA [auth c], J [auth H], K [auth J], L [auth R], M [auth T], N [auth b], O [auth d], U [auth F], V [auth I], Y [auth P], Z [auth S]	105	Methanosarcina acetivorans	Mutation(s): 0
UniProt
Find proteins for Q8TJ92 (Methanosarcina acetivorans (strain ATCC 35395 / DSM 2834 / JCM 12185 / C2A)) Explore Q8TJ92 Go to UniProtKB: Q8TJ92
Entity Groups
Sequence Clusters	30% Identity 50% Identity 70% Identity 90% Identity 95% Identity 100% Identity
UniProt Group	Q8TJ92
Sequence Annotations Expand
Reference Sequence

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| 3D Structure

Entity ID: 4
Molecule	Chains	Sequence Length	Organism	Details	Image
P-II family nitrogen regulatory protein	AA [auth a] BA [auth Y] S [auth G] T [auth E] W [auth Q] AA [auth a], BA [auth Y], S [auth G], T [auth E], W [auth Q], X [auth O]	125	Methanosarcina acetivorans	Mutation(s): 0
UniProt
Find proteins for Q8TJ91 (Methanosarcina acetivorans (strain ATCC 35395 / DSM 2834 / JCM 12185 / C2A)) Explore Q8TJ91 Go to UniProtKB: Q8TJ91
Entity Groups
Sequence Clusters	30% Identity 50% Identity 70% Identity 90% Identity 95% Identity 100% Identity
UniProt Group	Q8TJ91
Sequence Annotations Expand
Reference Sequence

Small Molecules

Ligands 3 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram	3D Interactions
ICS (Subject of Investigation/LOI) Query on ICS Download:Ideal Coordinates CCD File SDF format, chain UA [auth U] SDF format, chain SA [auth L] SDF format, chain OA [auth V] SDF format, chain KA [auth K] SDF format, chain HA [auth C] SDF format, chain FA [auth A] MOL2 format, chain UA [auth U] MOL2 format, chain SA [auth L] MOL2 format, chain OA [auth V] MOL2 format, chain KA [auth K] MOL2 format, chain HA [auth C] MOL2 format, chain FA [auth A] mmCIF format, chain UA [auth U] mmCIF format, chain SA [auth L] mmCIF format, chain OA [auth V] mmCIF format, chain KA [auth K] mmCIF format, chain HA [auth C] mmCIF format, chain FA [auth A]	FA [auth A] HA [auth C] KA [auth K] OA [auth V] SA [auth L] FA [auth A], HA [auth C], KA [auth K], OA [auth V], SA [auth L], UA [auth U]	iron-sulfur-molybdenum cluster with interstitial carbon C Fe₇ Mo S₉ DDQFAOMIVKLFON-UHFFFAOYSA-N		Interactions Focus chain FA [auth A] Focus chain HA [auth C] Focus chain KA [auth K] Focus chain OA [auth V] Focus chain SA [auth L] Focus chain UA [auth U] Interactions & Density Focus chain FA [auth A] Focus chain HA [auth C] Focus chain KA [auth K] Focus chain OA [auth V] Focus chain SA [auth L] Focus chain UA [auth U]
CLF (Subject of Investigation/LOI) Query on CLF Download:Ideal Coordinates CCD File SDF format, chain TA [auth L] SDF format, chain QA [auth W] SDF format, chain NA [auth V] SDF format, chain MA [auth M] SDF format, chain IA [auth D] SDF format, chain EA [auth A] MOL2 format, chain TA [auth L] MOL2 format, chain QA [auth W] MOL2 format, chain NA [auth V] MOL2 format, chain MA [auth M] MOL2 format, chain IA [auth D] MOL2 format, chain EA [auth A] mmCIF format, chain TA [auth L] mmCIF format, chain QA [auth W] mmCIF format, chain NA [auth V] mmCIF format, chain MA [auth M] mmCIF format, chain IA [auth D] mmCIF format, chain EA [auth A]	EA [auth A] IA [auth D] MA [auth M] NA [auth V] QA [auth W] EA [auth A], IA [auth D], MA [auth M], NA [auth V], QA [auth W], TA [auth L]	FE(8)-S(7) CLUSTER Fe₈ S₇ JKVMXLBGZBULKV-UHFFFAOYSA-N		Interactions Focus chain EA [auth A] Focus chain IA [auth D] Focus chain MA [auth M] Focus chain NA [auth V] Focus chain QA [auth W] Focus chain TA [auth L] Interactions & Density Focus chain EA [auth A] Focus chain IA [auth D] Focus chain MA [auth M] Focus chain NA [auth V] Focus chain QA [auth W] Focus chain TA [auth L]
HCA (Subject of Investigation/LOI) Query on HCA Download:Ideal Coordinates CCD File SDF format, chain VA [auth U] SDF format, chain RA [auth L] SDF format, chain PA [auth V] SDF format, chain LA [auth K] SDF format, chain JA [auth D] SDF format, chain GA [auth A] MOL2 format, chain VA [auth U] MOL2 format, chain RA [auth L] MOL2 format, chain PA [auth V] MOL2 format, chain LA [auth K] MOL2 format, chain JA [auth D] MOL2 format, chain GA [auth A] mmCIF format, chain VA [auth U] mmCIF format, chain RA [auth L] mmCIF format, chain PA [auth V] mmCIF format, chain LA [auth K] mmCIF format, chain JA [auth D] mmCIF format, chain GA [auth A]	GA [auth A] JA [auth D] LA [auth K] PA [auth V] RA [auth L] GA [auth A], JA [auth D], LA [auth K], PA [auth V], RA [auth L], VA [auth U]	3-HYDROXY-3-CARBOXY-ADIPIC ACID C₇ H₁₀ O₇ XKJVEVRQMLKSMO-SSDOTTSWSA-N		Interactions Focus chain GA [auth A] Focus chain JA [auth D] Focus chain LA [auth K] Focus chain PA [auth V] Focus chain RA [auth L] Focus chain VA [auth U] Interactions & Density Focus chain GA [auth A] Focus chain JA [auth D] Focus chain LA [auth K] Focus chain PA [auth V] Focus chain RA [auth L] Focus chain VA [auth U]