SAXSdb — 3qi4

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

;High affinity cGMP-specific 3',5'-cyclic phosphodiesterase 9A ;

Homo sapiens

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein homooligomer	Homooligomer	Protein 2	3-ISOBUTYL-1-METHYLXANTHINE × 2 ZINC ION × 2 MAGNESIUM ION × 2 water × 2	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	PDE9A_HUMAN
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 1–533； UniProt 1–533 Author chain B； PDBConstruct 1–533； UniProt 1–533

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	3qi4
Deposition date deposition_date	2011-01-26
Structure title title	Crystal structure of PDE9A(Q453E) in complex with IBMX
Keywords keywords	PDE, HYDROLASE; HYDROLASE
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.

3qi4__assembly_1__model_1

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

Download this curve (.dat)

3qi4__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

3qi4__assembly_1__model_1 | P(r) · Pending

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

Rg（Guinier）	32.05 Å
Rg (electron density)	31.73 Å
Total Rg	32.15 Å
Atom count	5406
Residues	650
Excluded volume	96710 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`3qi4__assembly_1__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	;High affinity cGMP-specific 3',5'-cyclic phosphodiesterase 9A ;
Molecular weight formula_weight	61790.1 kDa
EC 编号 ec_number	3.1.4.35
Mutation mutation	Q453E
Source method src_method	man
Copy count entity_count	2

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	A,B
Atom count atom_count	5435

MGSGSSSYRPKAIYLDIDGRIQKVIFSKYCNSSDIMDLFCIATGLPRNTTISLLTTDDAMVSIDPTMPANSERTPYKVRPVAIKQLSEREELIQSVLAQVAEQFSRAFKINELKAEVANHLAVLEKRVELEGLKVVEIEKCKSDIKKMREELAARSSRTNCPCKYSFLDNHKKLTPRRDVPTYPKYLLSPETIEALRKPTFDVWLWEPNEMLSCLEHMYHDLGLVRDFSINPVTLRRWLFCVHDNYRNNPFHNFRHCFCVAQMMYSMVWLCSLQEKFSQTDILILMTAAICHDLDHPGYNNTYQINARTELAVRYNDISPLENHHCAVAFQILAEPECNIFSNIPPDGFKQIRQGMITLILATDMARHAEIMDSFKEKMENFDYSNEEHMTLLKMILIKCCDISNEVRPMEVAEPWVDCLLEEYFMQSDREKSEGLPVAPFMDRDKVTKATAEIGFIKFVLIPMFETVTKLFPMVEEIMLQPLWESRDRYEELKRIDDAMKELQKKTDSLTSGATEKSRERSRDVKNSEGDCA

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

Entity 2 Entity 2 non-polymer

Description description	3-ISOBUTYL-1-METHYLXANTHINE
Molecular weight formula_weight	222.2 kDa
Source method src_method	syn
Copy count entity_count	2

Entity 3 Entity 3 non-polymer

Description description	ZINC ION
Molecular weight formula_weight	65.4 kDa
Source method src_method	syn
Copy count entity_count	2

Entity 4 Entity 4 non-polymer

Description description	MAGNESIUM ION
Molecular weight formula_weight	24.3 kDa
Source method src_method	syn
Copy count entity_count	2

Entity 5 Entity 5 water

Description description	water
Molecular weight formula_weight	18.0 kDa
Source method src_method	nat
Copy count entity_count	29

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6. Fold Classification (SCOP + CATH) 4 domains

SCOP 2.08 (2 domains)

Domain ID domain_id	d3qi4a_
Class class	a — All alpha proteins
Fold Fold fold	a.211 — HD-domain/PDEase-like
Superfamily Superfamily superfamily	a.211.1 — HD-domain/PDEase-like
Family Family family	a.211.1.2 — PDEase

Domain ID domain_id	d3qi4b_
Class class	a — All alpha proteins
Fold Fold fold	a.211 — HD-domain/PDEase-like
Superfamily Superfamily superfamily	a.211.1 — HD-domain/PDEase-like
Family Family family	a.211.1.2 — PDEase

CATH v4.4 (2 domains)

Domain ID domain_id	3qi4A00
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	1300 — Catalytic domain of cyclic nucleotide phosphodiesterase 4b2b
Homologous superfamily homologous superfamily	10 — 3'5'-cyclic nucleotide phosphodiesterase, catalytic domain

Domain ID domain_id	3qi4B00
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	1300 — Catalytic domain of cyclic nucleotide phosphodiesterase 4b2b
Homologous superfamily homologous superfamily	10 — 3'5'-cyclic nucleotide phosphodiesterase, catalytic domain

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Unit-cell length a length_a	103.409 Å
Unit-cell length b length_b	103.409 Å
Unit-cell length c length_c	269.950 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 41 21 2
Space-group number int_tables_number	92
Crystal system crystal_system	—

Resolution resolution	2.500 Å
Low-resolution limit resolution_low	30.000 Å
R factor r_factor	0.2130
R_work r_work	0.2130
R_free r_free	0.2390

Crystal structure of PDE9A(Q453E) in complex with IBMX

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

;High affinity cGMP-specific 3',5'-cyclic phosphodiesterase 9A ;

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

3qi4__assembly_1__model_1

3qi4__assembly_1__model_1 | I(q)

3qi4__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 (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) 4 domains

SCOP 2.08 (2 domains)

CATH v4.4 (2 domains)

7. Citations (1)

Crystal structure of PDE9A(Q453E) in complex with IBMX

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

;High affinity cGMP-specific 3',5'-cyclic phosphodiesterase 9A ;

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

3qi4__assembly_1__model_1

3qi4__assembly_1__model_1 | I(q)

3qi4__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 (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) 4 domains

SCOP 2.08 (2 domains)

CATH v4.4 (2 domains)

7. Citations (1)