4ucx

Structure of the T18G small subunit mutant of D. fructosovorans NiFe- hydrogenase

Method: X-RAY DIFFRACTION

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1. Protein Identity and Related Structures Protein Identity & Related Structures

HYDROGENASE (NIFE) SMALL SUBUNIT HYDA

DESULFOVIBRIO FRUCTOSIVORANS

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein heterocomplex	Heteromer	Protein 2	NICKEL-DEPENDENT HYDROGENASE LARGE SUBUNIT × 1 （P18188） IRON/SULFUR CLUSTER × 2 FE3-S4 CLUSTER × 1 GLYCEROL × 6 CARBONMONOXIDE-(DICYANO) IRON × 1 NICKEL (II) ION × 1 MAGNESIUM ION × 2 water × 2	Consistent with protein count
2	Protein heterocomplex	Heteromer	Protein 2	NICKEL-DEPENDENT HYDROGENASE LARGE SUBUNIT × 1 （P18188） IRON/SULFUR CLUSTER × 2 FE3-S4 CLUSTER × 1 GLYCEROL × 1 CARBONMONOXIDE-(DICYANO) IRON × 1 NICKEL (II) ION × 1 MAGNESIUM ION × 1 water × 2	Consistent with protein count
3	Protein heterocomplex	Heteromer	Protein 2	NICKEL-DEPENDENT HYDROGENASE LARGE SUBUNIT × 1 （P18188） IRON/SULFUR CLUSTER × 2 FE3-S4 CLUSTER × 1 GLYCEROL × 2 CARBONMONOXIDE-(DICYANO) IRON × 1 NICKEL (II) ION × 1 MAGNESIUM ION × 1 water × 2	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	PHNS_DESFR
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 1–264； UniProt 51–314 Author chain B； PDBConstruct 1–264； UniProt 51–314 Author chain C； PDBConstruct 1–264； UniProt 51–314

NICKEL-DEPENDENT HYDROGENASE LARGE SUBUNIT

DESULFOVIBRIO FRUCTOSIVORANS

UniProt P18188

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein heterocomplex	Heteromer	Protein 2	HYDROGENASE (NIFE) SMALL SUBUNIT HYDA × 1 （P18187） IRON/SULFUR CLUSTER × 2 FE3-S4 CLUSTER × 1 GLYCEROL × 6 CARBONMONOXIDE-(DICYANO) IRON × 1 NICKEL (II) ION × 1 MAGNESIUM ION × 2 water × 2	Consistent with protein count
2	Protein heterocomplex	Heteromer	Protein 2	HYDROGENASE (NIFE) SMALL SUBUNIT HYDA × 1 （P18187） IRON/SULFUR CLUSTER × 2 FE3-S4 CLUSTER × 1 GLYCEROL × 1 CARBONMONOXIDE-(DICYANO) IRON × 1 NICKEL (II) ION × 1 MAGNESIUM ION × 1 water × 2	Consistent with protein count
3	Protein heterocomplex	Heteromer	Protein 2	HYDROGENASE (NIFE) SMALL SUBUNIT HYDA × 1 （P18187） IRON/SULFUR CLUSTER × 2 FE3-S4 CLUSTER × 1 GLYCEROL × 2 CARBONMONOXIDE-(DICYANO) IRON × 1 NICKEL (II) ION × 1 MAGNESIUM ION × 1 water × 2	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	PHNL_DESFR
Isoform	—
PDB entities	2
Chains and sequence ranges	Author chain Q； PDBConstruct 16–563； UniProt 2–549 Author chain R； PDBConstruct 16–563； UniProt 2–549 Author chain S； PDBConstruct 16–563； UniProt 2–549

The page prioritizes protein identity, the current assembly, associated components, oligomeric state and cross-PDB links. Chain mapping and sequence ranges are retained as data evidence. Internal IDs, import timestamps and assembly operation expressions are maintenance fields and are not shown here.

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2. Structure Basics 2. Structure Basics

Entry ID entry_id	4ucx
Deposition date deposition_date	2014-12-05
Structure title title	Structure of the T18G small subunit mutant of D. fructosovorans NiFe- hydrogenase
Keywords keywords	OXIDOREDUCTASE, NIFE-HYDROGENASE, T18G MUTANT; OXIDOREDUCTASE
Experimental Method method	X-RAY DIFFRACTION

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3. Official assembly/model SAXS Official SAXS Profiles

This page reads only the latest assembly calculations. Every curve maps to an explicit PDB entry, official biological assembly and coordinate model.

4ucx__assembly_1__model_1

Assembly 1 · Model 1 · CRYSOL 4.1.3-1-20251215 (887e7ef)

Download this curve (.dat)

4ucx__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

4ucx__assembly_1__model_1 | P(r) · Pending

P(r) will be calculated and displayed separately for the same assembly/model.

Rg（Guinier）	25.50 Å
Rg (electron density)	24.62 Å
Total Rg	25.44 Å
Atom count	6198
Residues	805
Excluded volume	110710 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`4ucx__assembly_1__model_1`	dimeric （2）	Success	4.1.3-1-20251215 (887e7ef)	View Download
2	1	`4ucx__assembly_2__model_1`	dimeric （2）	Success	4.1.3-1-20251215 (887e7ef)	View Download
3	1	`4ucx__assembly_3__model_1`	dimeric （2）	Success	4.1.3-1-20251215 (887e7ef)	View Download

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4. Crystallography and Experiment 4. Crystallography & Experiment

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5. Entities and Polymers Entities & Polymers (9)

Entity 1 Entity 1 polymer

Description description	HYDROGENASE (NIFE) SMALL SUBUNIT HYDA
Molecular weight formula_weight	28303.3 kDa
EC 编号 ec_number	1.12.2.1
Mutation mutation	YES
Source method src_method	man
Copy count entity_count	3

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	A,B,C
Atom count atom_count	19169

LTAKHRPSVVWLHNAECGGCTEAAIRTIKPYIDALILDTISLDYQETIMAAAGEAAEAALHQALEGKDGYYLVVEGGLPTIDGGQWGMVAGHPMIETTKKAAAKAKGIICIGTCSAYGGVQKAKPNPSQAKGVSEALGVKTINIPGCPPNPINFVGAVVHVLTKGIPDLDENGRPKLFYGELVHDNCPRLPHFEASEFAPSFDSEEAKKGFCLYELGCKGPVTYNNCPKVLFNQVNWPVQAGHPCLGCSEPDFWDTMTPFYEQG

Source Source

Source organism organism	DESULFOVIBRIO FRUCTOSIVORANS
NCBI taxonomy ID ncbi_taxonomy_id	878
Host organism host_organism	DESULFOVIBRIO FRUCTOSIVORANS JJ

Entity 2 Entity 2 polymer

Description description	NICKEL-DEPENDENT HYDROGENASE LARGE SUBUNIT
Molecular weight formula_weight	61200.8 kDa
EC 编号 ec_number	1.12.2.1
Source method src_method	man
Copy count entity_count	3

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	Q,R,S

ASWSHPQFEKGASGAAESKPTPQSTFTGPIVVDPITRIEGHLRIMVEVENGKVKDAWSSSQLFRGLEIILKGRDPRDAQHFTQRACGVCTYVHALASSRCVDDAVKVSIPANARMMRNLVMASQYLHDHLVHFYHLHALDWVDVTAALKADPNKAAKLAASIAPARPGNSAKALKAVQDKLKAFVESGQLGIFTNAYFLGGHKAYYLPPEVDLIATAHYLEALHMQVKAASAMAILGGKNPHTQFTVVGGCSNYQGLTKDPLANYLALSKEVCQFVNECYIPDLLAVAGFYKDWGGIGGTSNYLAFGEFATDDSSPEKHLATSQFPSGVITGRDLGKVDNVDLGAIYEDVKYSWYAPGGDGKHPYDGVTDPKYTKLDDKDHYSWMKAPRYKGKAMEVGPLARTFIAYAKGQPDFKKVVDMVLGKLSVPATALHSTLGRTAARGIETAIVCANMEKWIKEMADSGAKDNTLCAKWEMPEESKGVGLADAPRGALSHWIRIKGKKIDNFQLVVPSTWNLGPRGAQGDKSPVEEALIGTPIADPKRPVEILRTVHAFDPCIACGVH

Source Source

Source organism organism	DESULFOVIBRIO FRUCTOSIVORANS
NCBI taxonomy ID ncbi_taxonomy_id	878
Host organism host_organism	DESULFOVIBRIO FRUCTOSIVORANS JJ

Entity 3 Entity 3 non-polymer

Description description	IRON/SULFUR CLUSTER
Molecular weight formula_weight	351.6 kDa
Source method src_method	syn
Copy count entity_count	6

Entity 4 Entity 4 non-polymer

Description description	FE3-S4 CLUSTER
Molecular weight formula_weight	295.8 kDa
Source method src_method	syn
Copy count entity_count	3

Entity 5 Entity 5 non-polymer

Description description	GLYCEROL
Molecular weight formula_weight	92.1 kDa
Source method src_method	syn
Copy count entity_count	9

Entity 6 Entity 6 non-polymer

Description description	CARBONMONOXIDE-(DICYANO) IRON
Molecular weight formula_weight	135.9 kDa
Source method src_method	syn
Copy count entity_count	3

Entity 7 Entity 7 non-polymer

Description description	NICKEL (II) ION
Molecular weight formula_weight	58.7 kDa
Source method src_method	syn
Copy count entity_count	3

Entity 8 Entity 8 non-polymer

Description description	MAGNESIUM ION
Molecular weight formula_weight	24.3 kDa
Source method src_method	syn
Copy count entity_count	4

Entity 9 Entity 9 water

Description description	water
Molecular weight formula_weight	18.0 kDa
Source method src_method	nat
Copy count entity_count	606

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6. Fold Classification (SCOP + CATH) 15 domains

SCOP 2.08 (6 domains)

Domain ID domain_id	d4ucxa_
Class class	e — Multi-domain proteins (alpha and beta)
Fold Fold fold	e.19 — HydA/Nqo6-like
Superfamily Superfamily superfamily	e.19.1 — HydA/Nqo6-like
Family Family family	e.19.1.1 — Nickel-iron hydrogenase, small subunit

Domain ID domain_id	d4ucxb_
Class class	e — Multi-domain proteins (alpha and beta)
Fold Fold fold	e.19 — HydA/Nqo6-like
Superfamily Superfamily superfamily	e.19.1 — HydA/Nqo6-like
Family Family family	e.19.1.1 — Nickel-iron hydrogenase, small subunit

Domain ID domain_id	d4ucxc_
Class class	e — Multi-domain proteins (alpha and beta)
Fold Fold fold	e.19 — HydA/Nqo6-like
Superfamily Superfamily superfamily	e.19.1 — HydA/Nqo6-like
Family Family family	e.19.1.1 — Nickel-iron hydrogenase, small subunit

Domain ID domain_id	d4ucxq_
Class class	e — Multi-domain proteins (alpha and beta)
Fold Fold fold	e.18 — HydB/Nqo4-like
Superfamily Superfamily superfamily	e.18.1 — HydB/Nqo4-like
Family Family family	e.18.1.1 — Nickel-iron hydrogenase, large subunit

Domain ID domain_id	d4ucxr_
Class class	e — Multi-domain proteins (alpha and beta)
Fold Fold fold	e.18 — HydB/Nqo4-like
Superfamily Superfamily superfamily	e.18.1 — HydB/Nqo4-like
Family Family family	e.18.1.1 — Nickel-iron hydrogenase, large subunit

Domain ID domain_id	d4ucxs_
Class class	e — Multi-domain proteins (alpha and beta)
Fold Fold fold	e.18 — HydB/Nqo4-like
Superfamily Superfamily superfamily	e.18.1 — HydB/Nqo4-like
Family Family family	e.18.1.1 — Nickel-iron hydrogenase, large subunit

CATH v4.4 (9 domains)

Domain ID domain_id	4ucxA01
Class class	3 — Alpha Beta
Architecture architecture	40 — 3-Layer(aba) Sandwich
Topology topology	50 — Rossmann fold
Homologous superfamily homologous superfamily	700 — NADH:ubiquinone oxidoreductase-like, 20kDa subunit

Domain ID domain_id	4ucxA02
Class class	4 — Few Secondary Structures
Architecture architecture	10 — Irregular
Topology topology	480 — Cytochrome-c3 Hydrogenase; Chain A, domain 2
Homologous superfamily homologous superfamily	10 — Cytochrome-c3 hydrogenase, C-terminal domain

Domain ID domain_id	4ucxB01
Class class	3 — Alpha Beta
Architecture architecture	40 — 3-Layer(aba) Sandwich
Topology topology	50 — Rossmann fold
Homologous superfamily homologous superfamily	700 — NADH:ubiquinone oxidoreductase-like, 20kDa subunit

Domain ID domain_id	4ucxB02
Class class	4 — Few Secondary Structures
Architecture architecture	10 — Irregular
Topology topology	480 — Cytochrome-c3 Hydrogenase; Chain A, domain 2
Homologous superfamily homologous superfamily	10 — Cytochrome-c3 hydrogenase, C-terminal domain

Domain ID domain_id	4ucxC01
Class class	3 — Alpha Beta
Architecture architecture	40 — 3-Layer(aba) Sandwich
Topology topology	50 — Rossmann fold
Homologous superfamily homologous superfamily	700 — NADH:ubiquinone oxidoreductase-like, 20kDa subunit

Domain ID domain_id	4ucxC02
Class class	4 — Few Secondary Structures
Architecture architecture	10 — Irregular
Topology topology	480 — Cytochrome-c3 Hydrogenase; Chain A, domain 2
Homologous superfamily homologous superfamily	10 — Cytochrome-c3 hydrogenase, C-terminal domain

Domain ID domain_id	4ucxQ00
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	645 — Cytochrome-c3 Hydrogenase; chain B
Homologous superfamily homologous superfamily	10 — Cytochrome-c3 Hydrogenase, chain B

Domain ID domain_id	4ucxR00
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	645 — Cytochrome-c3 Hydrogenase; chain B
Homologous superfamily homologous superfamily	10 — Cytochrome-c3 Hydrogenase, chain B

Domain ID domain_id	4ucxS00
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	645 — Cytochrome-c3 Hydrogenase; chain B
Homologous superfamily homologous superfamily	10 — Cytochrome-c3 Hydrogenase, chain B

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Unit-cell length a length_a	62.600 Å
Unit-cell length b length_b	99.270 Å
Unit-cell length c length_c	182.080 Å
Unit-cell angle α angle_alpha	90.00 °
Unit-cell angle β angle_beta	92.32 °
Unit-cell angle γ angle_gamma	90.00 °
Molecules per unit cell Z z_pdb	6

Space group space_group	P 1 21 1
Space-group number int_tables_number	4
Crystal system crystal_system	—

Resolution resolution	1.950 Å
Low-resolution limit resolution_low	25.000 Å
R factor r_factor	0.1984
R_work r_work	0.1968
R_free r_free	0.2307

Structure of the T18G small subunit mutant of D. fructosovorans NiFe- hydrogenase

1. Protein Identity and Related Structures Protein Identity & Related Structures

HYDROGENASE (NIFE) SMALL SUBUNIT HYDA

State in the Current Structure

Other States of the Same Protein in the Database

NICKEL-DEPENDENT HYDROGENASE LARGE SUBUNIT

State in the Current Structure

Other States of the Same Protein in the Database

2. Structure Basics 2. Structure Basics

3. Official assembly/model SAXS Official SAXS Profiles

4ucx__assembly_1__model_1

4ucx__assembly_1__model_1 | I(q)

4ucx__assembly_1__model_1 | P(r) · Pending

4. Crystallography and Experiment 4. Crystallography & Experiment

Unit cell Unit Cell

Symmetry Symmetry

Refinement Refinement

Diffraction experiment Diffraction

5. Entities and Polymers Entities & Polymers (9)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

Entity 2 Entity 2 polymer

Polymer Polymer

Source Source

Entity 3 Entity 3 non-polymer

Entity 4 Entity 4 non-polymer

Entity 5 Entity 5 non-polymer

Entity 6 Entity 6 non-polymer

Entity 7 Entity 7 non-polymer

Entity 8 Entity 8 non-polymer

Entity 9 Entity 9 water

6. Fold Classification (SCOP + CATH) 15 domains

SCOP 2.08 (6 domains)

CATH v4.4 (9 domains)

7. Citations (1)

Structure of the T18G small subunit mutant of D. fructosovorans NiFe- hydrogenase

1. Protein Identity and Related Structures Protein Identity & Related Structures

HYDROGENASE (NIFE) SMALL SUBUNIT HYDA

State in the Current Structure

Other States of the Same Protein in the Database

Monomer

Homodimer

Homotetramer

Other homooligomers

Heteromeric or nucleic-acid complex

NICKEL-DEPENDENT HYDROGENASE LARGE SUBUNIT

State in the Current Structure

Other States of the Same Protein in the Database

Monomer

Homodimer

Homotetramer

Other homooligomers

Heteromeric or nucleic-acid complex

2. Structure Basics 2. Structure Basics

3. Official assembly/model SAXS Official SAXS Profiles

4ucx__assembly_1__model_1

4ucx__assembly_1__model_1 | I(q)

4ucx__assembly_1__model_1 | P(r) · Pending

4. Crystallography and Experiment 4. Crystallography & Experiment

Unit cell Unit Cell

Symmetry Symmetry

Refinement Refinement

Diffraction experiment Diffraction

5. Entities and Polymers Entities & Polymers (9)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

Entity 2 Entity 2 polymer

Polymer Polymer

Source Source

Entity 3 Entity 3 non-polymer

Entity 4 Entity 4 non-polymer

Entity 5 Entity 5 non-polymer

Entity 6 Entity 6 non-polymer

Entity 7 Entity 7 non-polymer

Entity 8 Entity 8 non-polymer

Entity 9 Entity 9 water

6. Fold Classification (SCOP + CATH) 15 domains

SCOP 2.08 (6 domains)

CATH v4.4 (9 domains)

7. Citations (1)