1s26

Structure of Anthrax Edema Factor-Calmodulin-alpha,beta-methyleneadenosine 5'-triphosphate Complex Reveals an Alternative Mode of ATP Binding to the Catalytic Site

Method: X-RAY DIFFRACTION

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

Calmodulin-sensitive adenylate cyclase

Bacillus anthracis

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein heterocomplex	Heteromer	Protein 2	Calmodulin × 1 （P62158） YTTERBIUM (III) ION × 1 DIPHOSPHOMETHYLPHOSPHONIC ACID ADENOSYL ESTER × 1 CALCIUM ION × 2	Consistent with protein count
2	Protein heterocomplex	Heteromer	Protein 2	Calmodulin × 1 （P62158） YTTERBIUM (III) ION × 1 DIPHOSPHOMETHYLPHOSPHONIC ACID ADENOSYL ESTER × 1 CALCIUM ION × 2	Consistent with protein count
3	Protein heterocomplex	Heteromer	Protein 2	Calmodulin × 1 （P62158） YTTERBIUM (III) ION × 1 DIPHOSPHOMETHYLPHOSPHONIC ACID ADENOSYL ESTER × 1 CALCIUM ION × 2	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	CYAA_BACAN
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 1–510； UniProt 291–800 Author chain B； PDBConstruct 1–510； UniProt 291–800 Author chain C； PDBConstruct 1–510； UniProt 291–800

Calmodulin

Homo sapiens

UniProt P62158

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein heterocomplex	Heteromer	Protein 2	Calmodulin-sensitive adenylate cyclase × 1 （P40136） YTTERBIUM (III) ION × 1 DIPHOSPHOMETHYLPHOSPHONIC ACID ADENOSYL ESTER × 1 CALCIUM ION × 2	Consistent with protein count
2	Protein heterocomplex	Heteromer	Protein 2	Calmodulin-sensitive adenylate cyclase × 1 （P40136） YTTERBIUM (III) ION × 1 DIPHOSPHOMETHYLPHOSPHONIC ACID ADENOSYL ESTER × 1 CALCIUM ION × 2	Consistent with protein count
3	Protein heterocomplex	Heteromer	Protein 2	Calmodulin-sensitive adenylate cyclase × 1 （P40136） YTTERBIUM (III) ION × 1 DIPHOSPHOMETHYLPHOSPHONIC ACID ADENOSYL ESTER × 1 CALCIUM ION × 2	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	CALM_HUMAN
Isoform	—
PDB entities	2
Chains and sequence ranges	Author chain D； PDBConstruct 1–148； UniProt 1–148 Author chain E； PDBConstruct 1–148； UniProt 1–148 Author chain F； PDBConstruct 1–148； UniProt 1–148

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	1s26
Deposition date deposition_date	2004-01-08
Structure title title	Structure of Anthrax Edema Factor-Calmodulin-alpha,beta-methyleneadenosine 5'-triphosphate Complex Reveals an Alternative Mode of ATP Binding to the Catalytic Site
Keywords keywords	AMPCPP, EDEMA FACTOR, CALMODULIN, TOXIN, LYASE-METAL BINDING PROTEIN COMPLEX; TOXIN,LYASE/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.

1s26__assembly_3__model_1

Assembly 3 · Model 1 · CRYSOL 4.1.3-1-20251215 (887e7ef)

Download this curve (.dat)

1s26__assembly_3__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

1s26__assembly_3__model_1 | P(r) · Pending

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

Rg（Guinier）	31.39 Å
Rg (electron density)	31.17 Å
Total Rg	31.62 Å
Atom count	5253
Residues	646
Excluded volume	93459 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`1s26__assembly_1__model_1`	dimeric （2）	Success	4.1.3-1-20251215 (887e7ef)	View Download
2	1	`1s26__assembly_2__model_1`	dimeric （2）	Success	4.1.3-1-20251215 (887e7ef)	View Download
3	1	`1s26__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 (5)

Entity 1 Entity 1 polymer

Description description	Calmodulin-sensitive adenylate cyclase
Molecular weight formula_weight	58810.6 kDa
EC 编号 ec_number	4.6.1.1
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	15317

DRIDVLKGEKALKASGLVPEHADAFKKIARELNTYILFRPVNKLATNLIKSGVATKGLNVHGKSSDWGPVAGYIPFDQDLSKKHGQQLAVEKGNLENKKSITEHEGEIGKIPLKLDHLRIEELKENGIILKGKKEIDNGKKYYLLESNNQVYEFRISDENNEVQYKTKEGKITVLGEKFNWRNIEVMAKNVEGVLKPLTADYDLFALAPSLTEIKKQIPQKEWDKVVNTPNSLEKQKGVTNLLIKYGIERKPDSTKGTLSNWQKQMLDRLNEAVKYTGYTGGDVVNHGTEQDNEEFPEKDNEIFIINPEGEFILTKNWEMTGRFIEKNITGKDYLYYFNRSYNKIAPGNKAYIEWTDPITKAKINTIPTSAEFIKNLSSIRRSSNVGVYKDSGDKDEFAKKESVKKIAGYLSDYYNSANHIFSQEKKRKISIFRGIQAYNEIENVLKSKQIAPEYKNYFQYLKERITNQVQLLLTHQKSNIEFKLLYKQLNFTENETDNFEVFQKIIDEK

Source Source

Source organism organism	Bacillus anthracis
NCBI taxonomy ID ncbi_taxonomy_id	1392
Host organism host_organism	Escherichia coli BL21

Entity 2 Entity 2 polymer

Description description	Calmodulin
Molecular weight formula_weight	16721.3 kDa
Source method src_method	man
Copy count entity_count	3

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	D,E,F

ADQLTEEQIAEFKEAFSLFDKDGDGTITTKELGTVMRSLGQNPTEAELQDMINEVDADGNGTIDFPEFLTMMARKMKDTDSEEEIREAFRVFDKDGNGYISAAELRHVMTNLGEKLTDEEVDEMIREADIDGDGQVNYEEFVQMMTAK

Source Source

Source organism organism	Homo sapiens
Common name common_name	human
NCBI taxonomy ID ncbi_taxonomy_id	9606
Host organism host_organism	Escherichia coli BL21

Entity 3 Entity 3 non-polymer

Description description	YTTERBIUM (III) ION
Molecular weight formula_weight	173.0 kDa
Source method src_method	syn
Copy count entity_count	3

Entity 4 Entity 4 non-polymer

Description description	DIPHOSPHOMETHYLPHOSPHONIC ACID ADENOSYL ESTER
Molecular weight formula_weight	505.2 kDa
Source method src_method	syn
Copy count entity_count	3

Entity 5 Entity 5 non-polymer

Description description	CALCIUM ION
Molecular weight formula_weight	40.1 kDa
Source method src_method	syn
Copy count entity_count	6

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6. Fold Classification (SCOP + CATH) 18 domains

SCOP 2.08 (6 domains)

Domain ID domain_id	d1s26a_
Class class	e — Multi-domain proteins (alpha and beta)
Fold Fold fold	e.41 — Adenylylcyclase toxin (the edema factor)
Superfamily Superfamily superfamily	e.41.1 — Adenylylcyclase toxin (the edema factor)
Family Family family	e.41.1.1 — Adenylylcyclase toxin (the edema factor)

Domain ID domain_id	d1s26b_
Class class	e — Multi-domain proteins (alpha and beta)
Fold Fold fold	e.41 — Adenylylcyclase toxin (the edema factor)
Superfamily Superfamily superfamily	e.41.1 — Adenylylcyclase toxin (the edema factor)
Family Family family	e.41.1.1 — Adenylylcyclase toxin (the edema factor)

Domain ID domain_id	d1s26c_
Class class	e — Multi-domain proteins (alpha and beta)
Fold Fold fold	e.41 — Adenylylcyclase toxin (the edema factor)
Superfamily Superfamily superfamily	e.41.1 — Adenylylcyclase toxin (the edema factor)
Family Family family	e.41.1.1 — Adenylylcyclase toxin (the edema factor)

Domain ID domain_id	d1s26d_
Class class	a — All alpha proteins
Fold Fold fold	a.39 — EF Hand-like
Superfamily Superfamily superfamily	a.39.1 — EF-hand
Family Family family	a.39.1.5 — Calmodulin-like

Domain ID domain_id	d1s26e_
Class class	a — All alpha proteins
Fold Fold fold	a.39 — EF Hand-like
Superfamily Superfamily superfamily	a.39.1 — EF-hand
Family Family family	a.39.1.5 — Calmodulin-like

Domain ID domain_id	d1s26f_
Class class	a — All alpha proteins
Fold Fold fold	a.39 — EF Hand-like
Superfamily Superfamily superfamily	a.39.1 — EF-hand
Family Family family	a.39.1.5 — Calmodulin-like

CATH v4.4 (12 domains)

Domain ID domain_id	1s26A02
Class class	3 — Alpha Beta
Architecture architecture	90 — Alpha-Beta Complex
Topology topology	1760 — Adenylylcyclase toxin fold
Homologous superfamily homologous superfamily	10 — Anthrax toxin, edema factor, central domain

Domain ID domain_id	1s26A03
Class class	1 — Mainly Alpha
Architecture architecture	20 — Up-down Bundle
Topology topology	140 — Butyryl-CoA Dehydrogenase, subunit A; domain 3
Homologous superfamily homologous superfamily	60 —

Domain ID domain_id	1s26B02
Class class	3 — Alpha Beta
Architecture architecture	90 — Alpha-Beta Complex
Topology topology	1760 — Adenylylcyclase toxin fold
Homologous superfamily homologous superfamily	10 — Anthrax toxin, edema factor, central domain

Domain ID domain_id	1s26B03
Class class	1 — Mainly Alpha
Architecture architecture	20 — Up-down Bundle
Topology topology	140 — Butyryl-CoA Dehydrogenase, subunit A; domain 3
Homologous superfamily homologous superfamily	60 —

Domain ID domain_id	1s26C02
Class class	3 — Alpha Beta
Architecture architecture	90 — Alpha-Beta Complex
Topology topology	1760 — Adenylylcyclase toxin fold
Homologous superfamily homologous superfamily	10 — Anthrax toxin, edema factor, central domain

Domain ID domain_id	1s26C03
Class class	1 — Mainly Alpha
Architecture architecture	20 — Up-down Bundle
Topology topology	140 — Butyryl-CoA Dehydrogenase, subunit A; domain 3
Homologous superfamily homologous superfamily	60 —

Domain ID domain_id	1s26D01
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	238 — Recoverin; domain 1
Homologous superfamily homologous superfamily	10 — EF-hand

Domain ID domain_id	1s26D02
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	238 — Recoverin; domain 1
Homologous superfamily homologous superfamily	10 — EF-hand

Domain ID domain_id	1s26E01
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	238 — Recoverin; domain 1
Homologous superfamily homologous superfamily	10 — EF-hand

Domain ID domain_id	1s26E02
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	238 — Recoverin; domain 1
Homologous superfamily homologous superfamily	10 — EF-hand

Domain ID domain_id	1s26F01
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	238 — Recoverin; domain 1
Homologous superfamily homologous superfamily	10 — EF-hand

Domain ID domain_id	1s26F02
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	238 — Recoverin; domain 1
Homologous superfamily homologous superfamily	10 — EF-hand

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Unit-cell length a length_a	117.555 Å
Unit-cell length b length_b	167.605 Å
Unit-cell length c length_c	345.346 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	24

Space group space_group	I 2 2 2
Space-group number int_tables_number	23
Crystal system crystal_system	—

Resolution resolution	3.000 Å
Low-resolution limit resolution_low	29.780 Å
R factor r_factor	0.2640
R_work r_work	0.2640
R_free r_free	0.3040

Structure of Anthrax Edema Factor-Calmodulin-alpha,beta-methyleneadenosine 5'-triphosphate Complex Reveals an Alternative Mode of ATP Binding to the Catalytic Site

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

Calmodulin-sensitive adenylate cyclase

State in the Current Structure

Other States of the Same Protein in the Database

Calmodulin

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

1s26__assembly_3__model_1

1s26__assembly_3__model_1 | I(q)

1s26__assembly_3__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 (5)

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

6. Fold Classification (SCOP + CATH) 18 domains

SCOP 2.08 (6 domains)

CATH v4.4 (12 domains)

7. Citations (2)

Structure of Anthrax Edema Factor-Calmodulin-alpha,beta-methyleneadenosine 5'-triphosphate Complex Reveals an Alternative Mode of ATP Binding to the Catalytic Site

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

Calmodulin-sensitive adenylate cyclase

State in the Current Structure

Other States of the Same Protein in the Database

Monomer

Homodimer

Homotetramer

Other homooligomers

Heteromeric or nucleic-acid complex

Calmodulin

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

1s26__assembly_3__model_1

1s26__assembly_3__model_1 | I(q)

1s26__assembly_3__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 (5)

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

6. Fold Classification (SCOP + CATH) 18 domains

SCOP 2.08 (6 domains)

CATH v4.4 (12 domains)

7. Citations (2)