SAXSdb — 2xdq

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

LIGHT-INDEPENDENT PROTOCHLOROPHYLLIDE REDUCTASE SUBUNIT N

THERMOSYNECHOCOCCUS ELONGATUS

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein heterocomplex	Heteromer	Protein 4	LIGHT-INDEPENDENT PROTOCHLOROPHYLLIDE REDUCTASE SUBUNIT B × 2 （Q8DGC6） IRON/SULFUR CLUSTER × 2 1-METHYLGUANIDINE × 2 SULFATE ION × 4 water × 4	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	CHLN_THEEB
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 1–460； UniProt 1–460

LIGHT-INDEPENDENT PROTOCHLOROPHYLLIDE REDUCTASE SUBUNIT B

THERMOSYNECHOCOCCUS ELONGATUS

UniProt Q8DGC6

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein heterocomplex	Heteromer	Protein 4	LIGHT-INDEPENDENT PROTOCHLOROPHYLLIDE REDUCTASE SUBUNIT N × 2 （Q8DGH2） IRON/SULFUR CLUSTER × 2 1-METHYLGUANIDINE × 2 SULFATE ION × 4 water × 4	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	CHLB_THEEB
Isoform	—
PDB entities	2
Chains and sequence ranges	Author chain B； PDBConstruct 4–511； UniProt 1–508

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	2xdq
Deposition date deposition_date	2010-05-06
Structure title title	Dark Operative Protochlorophyllide Oxidoreductase (ChlN-ChlB)2 Complex
Keywords keywords	OXIDOREDUCTASE, DPOR, (BACTERIO)CHLOROPHYLL BIOSYNTHESIS, PHOTOSYNTHESIS, NITROGENASE-LIKE; 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.

2xdq__assembly_1__model_1

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

Download this curve (.dat)

2xdq__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

2xdq__assembly_1__model_1 | P(r) · Pending

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

Rg（Guinier）	38.84 Å
Rg (electron density)	38.29 Å
Total Rg	38.68 Å
Atom count	13632
Residues	1730
Excluded volume	243450 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`2xdq__assembly_1__model_1`	tetrameric （4）	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 (6)

Entity 1 Entity 1 polymer

Description description	LIGHT-INDEPENDENT PROTOCHLOROPHYLLIDE REDUCTASE SUBUNIT N
Molecular weight formula_weight	51562.4 kDa
EC 编号 ec_number	1.18.-.-
Source method src_method	man
Copy count entity_count	1

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	A
Atom count atom_count	7097

MTVTAPNALNFECETGNYHTFCPISCVAWLYQKIEDSFFLVIGTKTCGYFLQNAMGVMIFAEPRYAMAELEEGDISAQLNDYEELKRLCLEIKRDRNPSVIVWIGTCTTEIIKMDLEGLAPKLEAEIGIPIVVARANGLDYAFTQGEDTVLAAMAARCPTSTAISDPEERNPIQRLLNFGKKKEEVQAQSSQYHPHPPLVLFGSLPDPVVTQLTLELKKQGIKVSGWLPAKRYTELPVIDEGYYVAGVNPFLSRTATTLIRRRKCQLITAPFPIGPDGTRTWIEQICATFGIQPQGLAEREAETWQKLSDYLELVRGKSVFFMGDNLLEISLARFLIRCGMRVLEIGIPYMDKRYQAAELALLSQTCAEMGHPLPTIVEKPDNYNQLQRIKALQPDLVITGMAHANPLEARGISTKWSVEFTFAQIHGFGNARDILELVTRPLRRNQALAGLGWQKLVAH

Source Source

Source organism organism	THERMOSYNECHOCOCCUS ELONGATUS
NCBI taxonomy ID ncbi_taxonomy_id	146786
Host organism host_organism	ESCHERICHIA COLI

Entity 2 Entity 2 polymer

Description description	LIGHT-INDEPENDENT PROTOCHLOROPHYLLIDE REDUCTASE SUBUNIT B
Molecular weight formula_weight	56597.3 kDa
EC 编号 ec_number	1.18.-.-
Source method src_method	man
Copy count entity_count	1

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	B

AAAMKLAYWMYAGPAHIGTLRIASSFKNVHGIMHAPLGDDYFNVMRSMLERERDFTPVTASIVDRHVLARGSQEKVVDNIIRKDTEEHPDLIVLTPTCTSSILQEDLQNFVRRASLSTTADVLLADVNHYRVNELQAADRTLEQIVQFYIDKARRQGTLGTSKTPTPSVNIIGITTLGFHNQHDCRELKQLMADLGIQVNLVIPAAATVHDLQRLPQAWFNLVPYREIGGLTAQYLEREFGQPSVRITPMGVVETARCIRAIQGVLNAQGAGVNYEAFIEQQTREVSQAAWFSRSIDCQNLTGKKAVVFGDNTHAAAMTKILSREMGIHVVWAGTYCKYDADWFRAEVAGFCDEVLITDDHTVVGDAIARVEPAAIFGTQMERHVGKRLNIPCGVIAAPIHIQDFPVGYRPFLGYEGTNQLVDLIYNSFTLGMEDHLLEIFGGHDTKAVIHKGLSADSDLTWTAAGLAELNKIPGFVRGKVKRNTEKFAREQGISEITVEVLYAAKEAVGA

Source Source

Source organism organism	THERMOSYNECHOCOCCUS ELONGATUS
NCBI taxonomy ID ncbi_taxonomy_id	146786
Host organism host_organism	ESCHERICHIA COLI

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	1

Entity 4 Entity 4 non-polymer

Description description	1-METHYLGUANIDINE
Molecular weight formula_weight	73.1 kDa
Source method src_method	syn
Copy count entity_count	1

Entity 5 Entity 5 non-polymer

Description description	SULFATE ION
Molecular weight formula_weight	96.1 kDa
Source method src_method	syn
Copy count entity_count	2

Entity 6 Entity 6 water

Description description	water
Molecular weight formula_weight	18.0 kDa
Source method src_method	nat
Copy count entity_count	140

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6. Fold Classification (SCOP + CATH) 7 domains

CATH v4.4 (7 domains)

Domain ID domain_id	2xdqA01
Class class	3 — Alpha Beta
Architecture architecture	40 — 3-Layer(aba) Sandwich
Topology topology	50 — Rossmann fold
Homologous superfamily homologous superfamily	1980 — Nitrogenase molybdenum iron protein domain

Domain ID domain_id	2xdqA02
Class class	3 — Alpha Beta
Architecture architecture	40 — 3-Layer(aba) Sandwich
Topology topology	50 — Rossmann fold
Homologous superfamily homologous superfamily	1980 — Nitrogenase molybdenum iron protein domain

Domain ID domain_id	2xdqA03
Class class	3 — Alpha Beta
Architecture architecture	40 — 3-Layer(aba) Sandwich
Topology topology	50 — Rossmann fold
Homologous superfamily homologous superfamily	1980 — Nitrogenase molybdenum iron protein domain

Domain ID domain_id	2xdqB01
Class class	3 — Alpha Beta
Architecture architecture	40 — 3-Layer(aba) Sandwich
Topology topology	50 — Rossmann fold
Homologous superfamily homologous superfamily	1980 — Nitrogenase molybdenum iron protein domain

Domain ID domain_id	2xdqB02
Class class	3 — Alpha Beta
Architecture architecture	40 — 3-Layer(aba) Sandwich
Topology topology	50 — Rossmann fold
Homologous superfamily homologous superfamily	1980 — Nitrogenase molybdenum iron protein domain

Domain ID domain_id	2xdqB03
Class class	1 — Mainly Alpha
Architecture architecture	20 — Up-down Bundle
Topology topology	89 — Nitrogenase Molybdenum-iron Protein, subunit B; domain 4
Homologous superfamily homologous superfamily	20 —

Domain ID domain_id	2xdqB04
Class class	3 — Alpha Beta
Architecture architecture	40 — 3-Layer(aba) Sandwich
Topology topology	50 — Rossmann fold
Homologous superfamily homologous superfamily	1980 — Nitrogenase molybdenum iron protein domain

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Unit-cell length a length_a	192.095 Å
Unit-cell length b length_b	192.095 Å
Unit-cell length c length_c	132.504 Å
Unit-cell angle α angle_alpha	90.00 °
Unit-cell angle β angle_beta	90.00 °
Unit-cell angle γ angle_gamma	120.00 °
Molecules per unit cell Z z_pdb	12

Space group space_group	P 63 2 2
Space-group number int_tables_number	182
Crystal system crystal_system	—

Resolution resolution	2.400 Å
Low-resolution limit resolution_low	103.650 Å
R factor r_factor	0.2041
R_work r_work	0.2013
R_free r_free	0.2569

Dark Operative Protochlorophyllide Oxidoreductase (ChlN-ChlB)2 Complex

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

LIGHT-INDEPENDENT PROTOCHLOROPHYLLIDE REDUCTASE SUBUNIT N

State in the Current Structure

Other States of the Same Protein in the Database

LIGHT-INDEPENDENT PROTOCHLOROPHYLLIDE REDUCTASE SUBUNIT B

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

2xdq__assembly_1__model_1

2xdq__assembly_1__model_1 | I(q)

2xdq__assembly_1__model_1 | P(r) · Pending

4. Crystallography and Experiment 4. Crystallography & Experiment

Unit cell Unit Cell

Symmetry Symmetry

Refinement Refinement

5. Entities and Polymers Entities & Polymers (6)

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 water

6. Fold Classification (SCOP + CATH) 7 domains

CATH v4.4 (7 domains)

7. Citations (1)

Dark Operative Protochlorophyllide Oxidoreductase (ChlN-ChlB)2 Complex

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

LIGHT-INDEPENDENT PROTOCHLOROPHYLLIDE REDUCTASE SUBUNIT N

State in the Current Structure

Other States of the Same Protein in the Database

Monomer

Homodimer

Homotetramer

Other homooligomers

Heteromeric or nucleic-acid complex

LIGHT-INDEPENDENT PROTOCHLOROPHYLLIDE REDUCTASE SUBUNIT B

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

2xdq__assembly_1__model_1

2xdq__assembly_1__model_1 | I(q)

2xdq__assembly_1__model_1 | P(r) · Pending

4. Crystallography and Experiment 4. Crystallography & Experiment

Unit cell Unit Cell

Symmetry Symmetry

Refinement Refinement

5. Entities and Polymers Entities & Polymers (6)

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 water

6. Fold Classification (SCOP + CATH) 7 domains

CATH v4.4 (7 domains)

7. Citations (1)