SAXSdb — 3a44

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

Hydrogenase nickel incorporation protein hypA

Pyrococcus kodakaraensis

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein homooligomer	Homooligomer	Protein 2	ZINC ION × 2	Consistent with protein count
2	Protein homooligomer	Homooligomer	Protein 2	ZINC ION × 2	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	HYPA_PYRKO
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 1–139； UniProt 1–139 Author chain B； PDBConstruct 1–139； UniProt 1–139 Author chain C； PDBConstruct 1–139； UniProt 1–139 Author chain D； PDBConstruct 1–139； UniProt 1–139

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	3a44
Deposition date deposition_date	2009-06-30
Structure title title	Crystal structure of HypA in the dimeric form
Keywords keywords	[NiFe] hydrogenase maturation, zinc-finger, nickel binding, domain swapping, Metal-binding, Nickel, METAL BINDING PROTEIN; METAL BINDING PROTEIN
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.

3a44__assembly_1__model_1

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

Download this curve (.dat)

3a44__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

3a44__assembly_1__model_1 | P(r) · Pending

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

Rg（Guinier）	24.61 Å
Rg (electron density)	23.18 Å
Total Rg	24.06 Å
Atom count	2011
Residues	268
Excluded volume	35668 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`3a44__assembly_1__model_1`	dimeric （2）	Success	4.1.3-1-20251215 (887e7ef)	View Download
2	1	`3a44__assembly_2__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 (2)

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6. Fold Classification (SCOP + CATH) 5 domains

CATH v4.4 (5 domains)

Domain ID domain_id	3a44A01
Class class	3 — Alpha Beta
Architecture architecture	30 — 2-Layer Sandwich
Topology topology	2320 — hypothetical protein PF0899 fold
Homologous superfamily homologous superfamily	50 —

Domain ID domain_id	3a44B01
Class class	3 — Alpha Beta
Architecture architecture	30 — 2-Layer Sandwich
Topology topology	2320 — hypothetical protein PF0899 fold
Homologous superfamily homologous superfamily	50 —

Domain ID domain_id	3a44C01
Class class	3 — Alpha Beta
Architecture architecture	30 — 2-Layer Sandwich
Topology topology	2320 — hypothetical protein PF0899 fold
Homologous superfamily homologous superfamily	50 —

Domain ID domain_id	3a44C02
Class class	4 — Few Secondary Structures
Architecture architecture	10 — Irregular
Topology topology	80 — Rhinovirus 14, subunit 4
Homologous superfamily homologous superfamily	120 —

Domain ID domain_id	3a44D01
Class class	3 — Alpha Beta
Architecture architecture	30 — 2-Layer Sandwich
Topology topology	2320 — hypothetical protein PF0899 fold
Homologous superfamily homologous superfamily	50 —

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Unit-cell length a length_a	56.830 Å
Unit-cell length b length_b	97.975 Å
Unit-cell length c length_c	136.480 Å
Unit-cell angle α angle_alpha	90.00 °
Unit-cell angle β angle_beta	90.00 °
Unit-cell angle γ angle_gamma	90.00 °
Molecules per unit cell Z z_pdb	16

Space group space_group	P 21 21 21
Space-group number int_tables_number	19
Crystal system crystal_system	—

Resolution resolution	3.310 Å
Low-resolution limit resolution_low	49.160 Å
R factor r_factor	0.2920
R_work r_work	0.2920
R_free r_free	0.3370

Description description	Hydrogenase nickel incorporation protein hypA
Molecular weight formula_weight	15740.0 kDa
Source method src_method	man
Copy count entity_count	4

Polymer type type	polypeptide(L)
Chain IDs strand_id	A,B,C,D
Atom count atom_count	3852

Crystal structure of HypA in the dimeric form

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

Hydrogenase nickel incorporation protein hypA

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

3a44__assembly_1__model_1

3a44__assembly_1__model_1 | I(q)

3a44__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 (2)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

Entity 2 Entity 2 non-polymer

6. Fold Classification (SCOP + CATH) 5 domains

CATH v4.4 (5 domains)

7. Citations (1)

Source organism organism	Pyrococcus kodakaraensis
Common name common_name	Thermococcus kodakaraensis
NCBI taxonomy ID ncbi_taxonomy_id	69014
Host organism host_organism	Escherichia coli

Description description	ZINC ION
Molecular weight formula_weight	65.4 kDa
Source method src_method	syn
Copy count entity_count	4

Crystal structure of HypA in the dimeric form

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

Hydrogenase nickel incorporation protein hypA

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

3a44__assembly_1__model_1

3a44__assembly_1__model_1 | I(q)

3a44__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 (2)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

Entity 2 Entity 2 non-polymer

6. Fold Classification (SCOP + CATH) 5 domains

CATH v4.4 (5 domains)

7. Citations (1)