SAXSdb — 1lla

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

HEMOCYANIN (SUBUNIT TYPE II)

Limulus polyphemus

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein monomer	Monomer	Protein 1	COPPER (II) ION × 2 SODIUM ION × 1 CHLORIDE ION × 1 water × 1	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	HCY2_LIMPO
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 1–628； UniProt 1–628

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	1lla
Deposition date deposition_date	1992-09-07
Structure title title	CRYSTAL STRUCTURE OF DEOXYGENATED LIMULUS POLYPHEMUS SUBUNIT II HEMOCYANIN AT 2.18 ANGSTROMS RESOLUTION: CLUES FOR A MECHANISM FOR ALLOSTERIC REGULATION
Keywords keywords	OXYGEN TRANSPORT; OXYGEN TRANSPORT
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.

1lla__assembly_1__model_1

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

Download this curve (.dat)

1lla__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

1lla__assembly_1__model_1 | P(r) · Pending

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

Rg（Guinier）	25.10 Å
Rg (electron density)	23.94 Å
Total Rg	24.80 Å
Atom count	4864
Residues	600
Excluded volume	85681 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`1lla__assembly_1__model_1`	monomeric （1）	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 (5)

Entity 1 Entity 1 polymer

Description description	HEMOCYANIN (SUBUNIT TYPE II)
Molecular weight formula_weight	72757.7 kDa
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	5196

TLHDKQIRICHLFEQLSSATVIGDGDKHKHSDRLKNVGKLQPGAIFSCFHPDHLEEARHLYEVFWEAGDFNDFIEIAKEARTFVNEGLFAFAAEVAVLHRDDCKGLYVPPVQEIFPDKFIPSAAINEAFKKAHVRPEFDESPILVDVQDTGNILDPEYRLAYYREDVGINAHHWHWHLVYPSTWNPKYFGKKKDRKGELFYYMHQQMCARYDCERLSNGMHRMLPFNNFDEPLAGYAPHLTHVASGKYYSPRPDGLKLRDLGDIEISEMVRMRERILDSIHLGYVISEDGSHKTLDELHGTDILGALVESSYESVNHEYYGNLHNWGHVTMARIHDPDGRFHEEPGVMSDTSTSLRDPIFYNWHRFIDNIFHEYKNTLKPYDHDVLNFPDIQVQDVTLHARVDNVVHTFMREQELELKHGINPGNARSIKARYYHLDHEPFSYAVNVQNNSASDKHATVRIFLAPKYDELGNEIKADELRRTAIELDKFKTDLHPGKNTVVRHSLDSSVTLSHQPTFEDLLHGVGLNEHKSEYCSCGWPSHLLVPKGNIKGMEYHLFVMLTDWDKDKVDGSESVACVDAVSYCGARDHKYPDKKPMGFPFDRPIHTEHISDFLTNNMFIKDIKIKFHE

Source Source

Source organism organism	Limulus polyphemus
Common name common_name	Atlantic horseshoe crab
NCBI taxonomy ID ncbi_taxonomy_id	6850

Entity 2 Entity 2 non-polymer

Description description	COPPER (II) ION
Molecular weight formula_weight	63.5 kDa
Source method src_method	syn
Copy count entity_count	2

Entity 3 Entity 3 non-polymer

Description description	SODIUM ION
Molecular weight formula_weight	23.0 kDa
Source method src_method	syn
Copy count entity_count	1

Entity 4 Entity 4 non-polymer

Description description	CHLORIDE ION
Molecular weight formula_weight	35.5 kDa
Source method src_method	syn
Copy count entity_count	1

Entity 5 Entity 5 water

Description description	water
Molecular weight formula_weight	18.0 kDa
Source method src_method	nat
Copy count entity_count	332

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6. Fold Classification (SCOP + CATH) 6 domains

SCOP 2.08 (3 domains)

Domain ID domain_id	d1llaa1
Class class	a — All alpha proteins
Fold Fold fold	a.85 — Hemocyanin, N-terminal domain
Superfamily Superfamily superfamily	a.85.1 — Hemocyanin, N-terminal domain
Family Family family	a.85.1.1 — Hemocyanin, N-terminal domain

Domain ID domain_id	d1llaa2
Class class	a — All alpha proteins
Fold Fold fold	a.86 — Di-copper centre-containing domain
Superfamily Superfamily superfamily	a.86.1 — Di-copper centre-containing domain
Family Family family	a.86.1.1 — Hemocyanin middle domain

Domain ID domain_id	d1llaa3
Class class	b — All beta proteins
Fold Fold fold	b.1 — Immunoglobulin-like beta-sandwich
Superfamily Superfamily superfamily	b.1.18 — E set domains
Family Family family	b.1.18.3 — Arthropod hemocyanin, C-terminal domain

CATH v4.4 (3 domains)

Domain ID domain_id	1llaA01
Class class	1 — Mainly Alpha
Architecture architecture	20 — Up-down Bundle
Topology topology	1370 — Hemocyanin, N-terminal domain
Homologous superfamily homologous superfamily	10 — Hemocyanin, N-terminal domain

Domain ID domain_id	1llaA02
Class class	2 — Mainly Beta
Architecture architecture	60 — Sandwich
Topology topology	40 — Immunoglobulin-like
Homologous superfamily homologous superfamily	1520 — Hemocyanin, C-terminal domain

Domain ID domain_id	1llaA03
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	1280 — di-copper center containing domain from catechol oxidase
Homologous superfamily homologous superfamily	10 — Di-copper center containing domain from catechol oxidase

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Unit-cell length a length_a	117.002 Å
Unit-cell length b length_b	117.002 Å
Unit-cell length c length_c	117.002 Å
Unit-cell angle α angle_alpha	60.02 °
Unit-cell angle β angle_beta	60.02 °
Unit-cell angle γ angle_gamma	60.02 °
Molecules per unit cell Z z_pdb	6

Space group space_group	R 3 2
Space-group number int_tables_number	155
Crystal system crystal_system	—

Resolution resolution	2.180 Å
Low-resolution limit resolution_low	10.000 Å
R factor r_factor	0.1740
R_work r_work	0.1740
R_free r_free	—

CRYSTAL STRUCTURE OF DEOXYGENATED LIMULUS POLYPHEMUS SUBUNIT II HEMOCYANIN AT 2.18 ANGSTROMS RESOLUTION: CLUES FOR A MECHANISM FOR ALLOSTERIC REGULATION

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

HEMOCYANIN (SUBUNIT TYPE II)

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

1lla__assembly_1__model_1

1lla__assembly_1__model_1 | I(q)

1lla__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 (5)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

Entity 2 Entity 2 non-polymer

Entity 3 Entity 3 non-polymer

Entity 4 Entity 4 non-polymer

Entity 5 Entity 5 water

6. Fold Classification (SCOP + CATH) 6 domains

SCOP 2.08 (3 domains)

CATH v4.4 (3 domains)

7. Citations (4)

CRYSTAL STRUCTURE OF DEOXYGENATED LIMULUS POLYPHEMUS SUBUNIT II HEMOCYANIN AT 2.18 ANGSTROMS RESOLUTION: CLUES FOR A MECHANISM FOR ALLOSTERIC REGULATION

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

HEMOCYANIN (SUBUNIT TYPE II)

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

1lla__assembly_1__model_1

1lla__assembly_1__model_1 | I(q)

1lla__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 (5)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

Entity 2 Entity 2 non-polymer

Entity 3 Entity 3 non-polymer

Entity 4 Entity 4 non-polymer

Entity 5 Entity 5 water

6. Fold Classification (SCOP + CATH) 6 domains

SCOP 2.08 (3 domains)

CATH v4.4 (3 domains)

7. Citations (4)