SAXSdb — 3q2p

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

Monellin chain B/Monellin chain A chimeric protein

Dioscoreophyllum cumminsii

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Insufficient information	Monomer	Protein 1	SODIUM ION × 1 water × 1	Consistent with protein count
2	Insufficient information	Monomer	Protein 1	water × 1	Consistent with protein count
3	Insufficient information	Monomer	Protein 1	water × 1	Consistent with protein count
4	Insufficient information	Monomer	Protein 1	water × 1	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	MONA_DIOCU
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 54–97； UniProt 2–45 Author chain B； PDBConstruct 54–97； UniProt 2–45 Author chain C； PDBConstruct 54–97； UniProt 2–45 Author chain D； PDBConstruct 54–97； UniProt 2–45

Monellin chain B/Monellin chain A chimeric protein

Dioscoreophyllum cumminsii

UniProt P02882

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Insufficient information	Monomer	Protein 1	SODIUM ION × 1 water × 1	Consistent with protein count
2	Insufficient information	Monomer	Protein 1	water × 1	Consistent with protein count
3	Insufficient information	Monomer	Protein 1	water × 1	Consistent with protein count
4	Insufficient information	Monomer	Protein 1	water × 1	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	MONB_DIOCU
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 2–51； UniProt 1–50 Author chain B； PDBConstruct 2–51； UniProt 1–50 Author chain C； PDBConstruct 2–51； UniProt 1–50 Author chain D； PDBConstruct 2–51； UniProt 1–50

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	3q2p
Deposition date deposition_date	2010-12-20
Structure title title	Reduced sweetness of a monellin (MNEI) mutant results from increased protein flexibility and disruption of a distant poly-(L-proline) II helix
Keywords keywords	sweet protein, sweet receptor, T1R2:T1R3, PLANT PROTEIN; PLANT 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.

3q2p__assembly_2__model_1

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

Download this curve (.dat)

3q2p__assembly_2__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

3q2p__assembly_2__model_1 | P(r) · Pending

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

Rg（Guinier）	15.09 Å
Rg (electron density)	14.10 Å
Total Rg	15.18 Å
Atom count	804
Residues	97
Excluded volume	14373 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`3q2p__assembly_1__model_1`	monomeric （1）	Success	4.1.3-1-20251215 (887e7ef)	View Download
2	1	`3q2p__assembly_2__model_1`	monomeric （1）	Success	4.1.3-1-20251215 (887e7ef)	View Download
3	1	`3q2p__assembly_3__model_1`	monomeric （1）	Success	4.1.3-1-20251215 (887e7ef)	View Download
4	1	`3q2p__assembly_4__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 (3)

Entity 1 Entity 1 polymer

Description description	Monellin chain B/Monellin chain A chimeric protein
Molecular weight formula_weight	11405.0 kDa
Mutation mutation	G16A, V37A
Source method src_method	man
Copy count entity_count	4

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	A,B,C,D
Atom count atom_count	3404

MGEWEIIDIGPFTQNLAKFAVDEENKIGQYGRLTFNKAIRPCMKKTIYENEGFREIKGYEYQLYVYASDKLFRADISEDYKTRGRKLLRFNGPVPPP

Source Source

Source organism organism	Dioscoreophyllum cumminsii
Common name common_name	Serendipity berry
NCBI taxonomy ID ncbi_taxonomy_id	3457
Host organism host_organism	Escherichia coli

Entity 2 Entity 2 non-polymer

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

Entity 3 Entity 3 water

Description description	water
Molecular weight formula_weight	18.0 kDa
Source method src_method	nat
Copy count entity_count	202

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6. Fold Classification (SCOP + CATH) 8 domains

SCOP 2.08 (4 domains)

Domain ID domain_id	d3q2pa_
Class class	d — Alpha and beta proteins (a+b)
Fold Fold fold	d.17 — Cystatin-like
Superfamily Superfamily superfamily	d.17.1 — Cystatin/monellin
Family Family family	d.17.1.1 — Monellin

Domain ID domain_id	d3q2pb_
Class class	d — Alpha and beta proteins (a+b)
Fold Fold fold	d.17 — Cystatin-like
Superfamily Superfamily superfamily	d.17.1 — Cystatin/monellin
Family Family family	d.17.1.1 — Monellin

Domain ID domain_id	d3q2pc_
Class class	d — Alpha and beta proteins (a+b)
Fold Fold fold	d.17 — Cystatin-like
Superfamily Superfamily superfamily	d.17.1 — Cystatin/monellin
Family Family family	d.17.1.1 — Monellin

Domain ID domain_id	d3q2pd_
Class class	d — Alpha and beta proteins (a+b)
Fold Fold fold	d.17 — Cystatin-like
Superfamily Superfamily superfamily	d.17.1 — Cystatin/monellin
Family Family family	d.17.1.1 — Monellin

CATH v4.4 (4 domains)

Domain ID domain_id	3q2pA00
Class class	3 — Alpha Beta
Architecture architecture	10 — Roll
Topology topology	450 — Nuclear Transport Factor 2; Chain: A,
Homologous superfamily homologous superfamily	10 —

Domain ID domain_id	3q2pB00
Class class	3 — Alpha Beta
Architecture architecture	10 — Roll
Topology topology	450 — Nuclear Transport Factor 2; Chain: A,
Homologous superfamily homologous superfamily	10 —

Domain ID domain_id	3q2pC00
Class class	3 — Alpha Beta
Architecture architecture	10 — Roll
Topology topology	450 — Nuclear Transport Factor 2; Chain: A,
Homologous superfamily homologous superfamily	10 —

Domain ID domain_id	3q2pD00
Class class	3 — Alpha Beta
Architecture architecture	10 — Roll
Topology topology	450 — Nuclear Transport Factor 2; Chain: A,
Homologous superfamily homologous superfamily	10 —

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Unit-cell length a length_a	31.400 Å
Unit-cell length b length_b	144.100 Å
Unit-cell length c length_c	45.800 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	8

Space group space_group	P 1 21 1
Space-group number int_tables_number	4
Crystal system crystal_system	—

Resolution resolution	2.341 Å
Low-resolution limit resolution_low	31.400 Å
R factor r_factor	0.1870
R_work r_work	0.1838
R_free r_free	0.2453

Reduced sweetness of a monellin (MNEI) mutant results from increased protein flexibility and disruption of a distant poly-(L-proline) II helix

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

Monellin chain B/Monellin chain A chimeric protein

State in the Current Structure

Other States of the Same Protein in the Database

Monellin chain B/Monellin chain A chimeric protein

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

3q2p__assembly_2__model_1

3q2p__assembly_2__model_1 | I(q)

3q2p__assembly_2__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 (3)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

Entity 2 Entity 2 non-polymer

Entity 3 Entity 3 water

6. Fold Classification (SCOP + CATH) 8 domains

SCOP 2.08 (4 domains)

CATH v4.4 (4 domains)

7. Citations (1)

Reduced sweetness of a monellin (MNEI) mutant results from increased protein flexibility and disruption of a distant poly-(L-proline) II helix

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

Monellin chain B/Monellin chain A chimeric protein

State in the Current Structure

Other States of the Same Protein in the Database

Monomer

Homodimer

Homotetramer

Other homooligomers

Heteromeric or nucleic-acid complex

Monellin chain B/Monellin chain A chimeric protein

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

3q2p__assembly_2__model_1

3q2p__assembly_2__model_1 | I(q)

3q2p__assembly_2__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 (3)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

Entity 2 Entity 2 non-polymer

Entity 3 Entity 3 water

6. Fold Classification (SCOP + CATH) 8 domains

SCOP 2.08 (4 domains)

CATH v4.4 (4 domains)

7. Citations (1)