SAXSdb — 3lzf

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

Hemagglutinin, HA1 Subunit

Influenza A virus

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Other combination	Heteromer	Protein 12 其他Polymer 9	2D1 Fab, Heavy Chain × 3 2D1 Fab, Light Chain × 3 2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose × 6 ;alpha-D-mannopyranose-(1-3)-beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose ; × 3 2-acetamido-2-deoxy-beta-D-glucopyranose × 3	Consistent with protein count
2	Other combination	Homooligomer	Protein 6 其他Polymer 9	2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose × 6 ;alpha-D-mannopyranose-(1-3)-beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose ; × 3 2-acetamido-2-deoxy-beta-D-glucopyranose × 3	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	HEMA_I18A0
Isoform	—
PDB entities	1, 2
Chains and sequence ranges	Author chain A； PDBConstruct 5–331； UniProt 18–344 Author chain B； PDBConstruct 1–176； UniProt 345–520

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	3lzf
Deposition date deposition_date	2010-03-01
Structure title title	Crystal Structure of Fab 2D1 in Complex with the 1918 Influenza Virus Hemagglutinin
Keywords keywords	;hemagglutinin, Fab, neutralizing antibodies, antibody, pandemic flu, swine flu, Envelope protein, Fusion protein, Glycoprotein, antigen, Virion, VIRAL PROTEIN-IMMUNE SYSTEM complex ;; VIRAL PROTEIN/IMMUNE SYSTEM
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.

3lzf__assembly_2__model_1

Assembly 2 · Model 1 · CRYSOL 4.1.3-1-20251215 (887e7ef)

Download this curve (.dat)

3lzf__assembly_2__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

3lzf__assembly_2__model_1 | P(r) · Pending

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

Rg（Guinier）	42.31 Å
Rg (electron density)	41.91 Å
Total Rg	42.06 Å
Atom count	12051
Residues	1488
Excluded volume	212150 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`3lzf__assembly_1__model_1`	dodecameric （12）	Success	4.1.3-1-20251215 (887e7ef)	View Download
2	1	`3lzf__assembly_2__model_1`	hexameric （6）	Success	4.1.3-1-20251215 (887e7ef)	View Download
3	1	`3lzf__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 (7)

Entity 1 Entity 1 polymer

Description description	Hemagglutinin, HA1 Subunit
Molecular weight formula_weight	36452.8 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	7207

ADPGDTICIGYHANNSTDTVDTVLEKNVTVTHSVNLLEDSHNGKLCKLKGIAPLQLGKCNIAGWLLGNPECDLLLTASSWSYIVETSNSENGTCYPGDFIDYEELREQLSSVSSFEKFEIFPKTSSWPNHETTKGVTAACSYAGASSFYRNLLWLTKKGSSYPKLSKSYVNNKGKEVLVLWGVHHPPTGTDQQSLYQNADAYVSVGSSKYNRRFTPEIAARPKVRDQAGRMNYYWTLLEPGDTITFEATGNLIAPWYAFALNRGSGSGIITSDAPVHDCNTKCQTPHGAINSSLPFQNIHPVTIGECPKYVRSTKLRMATGLRNIPSIQSR

Source Source

Source organism organism	Influenza A virus
Common name common_name	Influenza A virus
NCBI taxonomy ID ncbi_taxonomy_id	59375
Host organism host_organism	Trichoplusia ni

Entity 2 Entity 2 polymer

Description description	Hemagglutinin, HA2 Subunit
Molecular weight formula_weight	20394.4 kDa
Source method src_method	man
Copy count entity_count	1

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	B

GLFGAIAGFIEGGWTGMIDGWYGYHHQNEQGSGYAADQKSTQNAIDGITNKVNSVIEKMNTQFTAVGKEFNNLERRIENLNKKVDDGFLDIWTYNAELLVLLENERTLDFHDSNVRNLYEKVKSQLKNNAKEIGNGCFEFYHKCDDACMESVRNGTYDYPKYSEESKLNREEIDGVSGR

Source Source

Source organism organism	Influenza A virus
Common name common_name	Influenza A virus
NCBI taxonomy ID ncbi_taxonomy_id	59375
Host organism host_organism	Trichoplusia ni

Entity 3 Entity 3 polymer

Description description	2D1 Fab, Heavy Chain
Molecular weight formula_weight	24699.8 kDa
Source method src_method	man
Copy count entity_count	1

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	H

EVQLVESGPALVKPTQTLTLTCSFSGFSLSTSGMSVSWIRQPPGKALEWLALIDWDDDTYYITYSSSLKTRLTISKDTSKSQVVLTMTNMDPVDTATYYCARTLRVSGDYVRDFDLWGRGTLVTVSSASTKGPSVFPLAPSSKSTSGGTAALGCLVKDYFPEPVTVSWNSGALTSGVHTFPAVLQSSGLYSLSSVVTVPSSSLGTQTYICNVNHKPSNTKVDKRVEPKSC

Source Source

Source organism organism	Homo sapiens
NCBI taxonomy ID ncbi_taxonomy_id	9606
Host organism host_organism	Homo sapiens

Entity 4 Entity 4 polymer

Description description	2D1 Fab, Light Chain
Molecular weight formula_weight	22812.1 kDa
Source method src_method	man
Copy count entity_count	1

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	L

QPVLTQPPSASGTPGQRVTISCSGSSSNIGSNTVSWYQQVPGTAPKLLIYGNNERPSGVPDRFSGSKSATSASLAISGLQSEDEADYYCAAWDDSLNGFWVFGGGTKLTVLGQPKAAPSVTLFPPSSEELQANKATLVCLISDFYPGAVTVAWKADSSPVKAGVETTTPSKQSNNKYAASSYLSLTPEQWKSHKSYSCQVTHEGSTVEKTVAPTECS

Source Source

Source organism organism	Homo sapiens
NCBI taxonomy ID ncbi_taxonomy_id	9606
Host organism host_organism	Homo sapiens

Entity 5 Entity 5 branched

Description description	2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose
Molecular weight formula_weight	424.4 kDa
Source method src_method	man
Copy count entity_count	2

Entity 6 Entity 6 branched

Description description	;alpha-D-mannopyranose-(1-3)-beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose ;
Molecular weight formula_weight	748.7 kDa
Source method src_method	man
Copy count entity_count	1

Entity 7 Entity 7 non-polymer

Description description	2-acetamido-2-deoxy-beta-D-glucopyranose
Molecular weight formula_weight	221.2 kDa
Source method src_method	man
Copy count entity_count	1

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6. Fold Classification (SCOP + CATH) 12 domains

SCOP 2.08 (5 domains)

Domain ID domain_id	d3lzfa_
Class class	b — All beta proteins
Fold Fold fold	b.19 — Viral protein domain
Superfamily Superfamily superfamily	b.19.1 — Viral protein domain
Family Family family	b.19.1.2 — Influenza hemagglutinin headpiece

Domain ID domain_id	d3lzfb_
Class class	h — Coiled coil proteins
Fold Fold fold	h.3 — Stalk segment of viral fusion proteins
Superfamily Superfamily superfamily	h.3.1 — Influenza hemagglutinin (stalk)
Family Family family	h.3.1.1 — Influenza hemagglutinin (stalk)

Domain ID domain_id	d3lzfh_
Class class	b — All beta proteins
Fold Fold fold	b.1 — Immunoglobulin-like beta-sandwich
Superfamily Superfamily superfamily	b.1.1 — Immunoglobulin
Family Family family	b.1.1.0 — automated matches

Domain ID domain_id	d3lzfl1
Class class	b — All beta proteins
Fold Fold fold	b.1 — Immunoglobulin-like beta-sandwich
Superfamily Superfamily superfamily	b.1.1 — Immunoglobulin
Family Family family	b.1.1.0 — automated matches

Domain ID domain_id	d3lzfl2
Class class	b — All beta proteins
Fold Fold fold	b.1 — Immunoglobulin-like beta-sandwich
Superfamily Superfamily superfamily	b.1.1 — Immunoglobulin
Family Family family	b.1.1.2 — C1 set domains (antibody constant domain-like)

CATH v4.4 (7 domains)

Domain ID domain_id	3lzfA01
Class class	2 — Mainly Beta
Architecture architecture	10 — Ribbon
Topology topology	77 — Hemagglutinin; Chain A, domain 2
Homologous superfamily homologous superfamily	10 — Hemagglutinin Chain A, Domain 2

Domain ID domain_id	3lzfA02
Class class	3 — Alpha Beta
Architecture architecture	90 — Alpha-Beta Complex
Topology topology	209 — Hemagglutinin (Ha1 Chain); Chain: A; domain 1
Homologous superfamily homologous superfamily	20 — Haemagglutinin, alpha/beta domain, HA1 chain

Domain ID domain_id	3lzfB00
Class class	3 — Alpha Beta
Architecture architecture	90 — Alpha-Beta Complex
Topology topology	20 — Hemagglutinin Ectodomain; Chain B
Homologous superfamily homologous superfamily	10 —

Domain ID domain_id	3lzfH01
Class class	2 — Mainly Beta
Architecture architecture	60 — Sandwich
Topology topology	40 — Immunoglobulin-like
Homologous superfamily homologous superfamily	10 — Immunoglobulins

Domain ID domain_id	3lzfH02
Class class	2 — Mainly Beta
Architecture architecture	60 — Sandwich
Topology topology	40 — Immunoglobulin-like
Homologous superfamily homologous superfamily	10 — Immunoglobulins

Domain ID domain_id	3lzfL01
Class class	2 — Mainly Beta
Architecture architecture	60 — Sandwich
Topology topology	40 — Immunoglobulin-like
Homologous superfamily homologous superfamily	10 — Immunoglobulins

Domain ID domain_id	3lzfL02
Class class	2 — Mainly Beta
Architecture architecture	60 — Sandwich
Topology topology	40 — Immunoglobulin-like
Homologous superfamily homologous superfamily	10 — Immunoglobulins

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Unit-cell length a length_a	161.745 Å
Unit-cell length b length_b	161.745 Å
Unit-cell length c length_c	143.473 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	6

Space group space_group	P 3 2 1
Space-group number int_tables_number	150
Crystal system crystal_system	—

Resolution resolution	2.800 Å
Low-resolution limit resolution_low	49.690 Å
R factor r_factor	0.2315
R_work r_work	0.2301
R_free r_free	0.2591

Crystal Structure of Fab 2D1 in Complex with the 1918 Influenza Virus Hemagglutinin

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

Hemagglutinin, HA1 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

3lzf__assembly_2__model_1

3lzf__assembly_2__model_1 | I(q)

3lzf__assembly_2__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 (7)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

Entity 2 Entity 2 polymer

Polymer Polymer

Source Source

Entity 3 Entity 3 polymer

Polymer Polymer

Source Source

Entity 4 Entity 4 polymer

Polymer Polymer

Source Source

Entity 5 Entity 5 branched

Entity 6 Entity 6 branched

Entity 7 Entity 7 non-polymer

6. Fold Classification (SCOP + CATH) 12 domains

SCOP 2.08 (5 domains)

CATH v4.4 (7 domains)

7. Citations (1)

Crystal Structure of Fab 2D1 in Complex with the 1918 Influenza Virus Hemagglutinin

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

Hemagglutinin, HA1 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

3lzf__assembly_2__model_1

3lzf__assembly_2__model_1 | I(q)

3lzf__assembly_2__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 (7)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

Entity 2 Entity 2 polymer

Polymer Polymer

Source Source

Entity 3 Entity 3 polymer

Polymer Polymer

Source Source

Entity 4 Entity 4 polymer

Polymer Polymer

Source Source

Entity 5 Entity 5 branched

Entity 6 Entity 6 branched

Entity 7 Entity 7 non-polymer

6. Fold Classification (SCOP + CATH) 12 domains

SCOP 2.08 (5 domains)

CATH v4.4 (7 domains)

7. Citations (1)