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1mpn

MALTOPORIN MALTOTRIOSE COMPLEX

Method: X-RAY DIFFRACTION Dmax: 97.0 Å Quality: EXCELLENT
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1. Protein Identity and Related Structures Protein Identity & Related Structures

MALTOPORIN

OrganismNot specified

UniProt P02943

State in the Current Structure

Assembly Oligomeric State Construct Mutations and Modifications Ligands, Ions and Associated Components Method and Experimental Conditions Structure Quality
1 Other combination Homooligomer Protein × 3 其他Polymer 3 PDB declaration: trimeric（3） Consistent with protein copy count Chain A； UniProt 26–446 Chain B； UniProt 26–446 Chain C； UniProt 26–446 Not recorded alpha-D-glucopyranose-(1-4)-alpha-D-glucopyranose-(1-4)-alpha-D-glucopyranose × 3 MG MAGNESIUM ION × 3 X-RAY DIFFRACTION X-ray crystallization conditions：pH 7；pH 7.0 Resolution 3.20 Å R-free 0.231

Other States of the Same Protein in the Database

Each row is a biological assembly of the same UniProt protein in another PDB entry. The “Difference from current entry” column identifies evidence-level differences; no tag means the currently parsed fields agree.

Other PDB Difference from Current Entry 1MPN Assembly / Oligomeric State Construct Mutations and Modifications Ligands, Ions and Non-polymers Method and Experimental Conditions Structure Quality
1AF6 MALTOPORIN SUCROSE COMPLEX Deposited 1997-03-21 Different ligand/ion Different experimental conditions Different structure-quality metrics Assembly 1 Other combination Homooligomer；Protein × 3 PDB declaration: trimeric
Chain A 26–446（421 aa）
Chain B 26–446（421 aa）
Chain C 26–446（421 aa）
Not recorded MG MAGNESIUM ION × 4 X-RAY DIFFRACTION
X-ray crystallization conditions pH 7；pH 7.
Resolution 2.40 Å R-free 0.214
1MAL STRUCTURAL BASIS FOR SUGAR TRANSLOCATION THROUGH MALTOPORIN CHANNELS AT 3.1 ANGSTROMS RESOLUTION Deposited 1994-11-24 Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics Assembly 1 Protein homooligomer Homooligomer；Protein × 3 PDB declaration: trimeric
Chain A 26–446（421 aa）
Chain B 26–446（421 aa）
Chain C 26–446（421 aa）
Not recorded No recorded non-water small molecule X-RAY DIFFRACTION mmCIF provides none of the parsed conditions Resolution 3.10 Å R-free 0.240
1MPM MALTOPORIN MALTOSE COMPLEX Deposited 1996-01-11 Different oligomeric state Different experimental conditions Different structure-quality metrics Assembly 1 Other combination Homooligomer；Protein × 3 PDB declaration: trimeric
Chain A 26–446（421 aa）
Chain B 26–446（421 aa）
Chain C 26–446（421 aa）
Not recorded MG MAGNESIUM ION × 3 X-RAY DIFFRACTION
X-ray crystallization conditions pH 7；pH 7.
Resolution 2.60 Å R-free 0.243
1MPO MALTOPORIN MALTOHEXAOSE COMPLEX Deposited 1996-01-11 Different experimental conditions Different structure-quality metrics Assembly 1 Other combination Homooligomer；Protein × 3 PDB declaration: trimeric
Chain A 26–446（421 aa）
Chain B 26–446（421 aa）
Chain C 26–446（421 aa）
Not recorded MG MAGNESIUM ION × 3 X-RAY DIFFRACTION
X-ray crystallization conditions pH 7；pH 7.
Resolution 2.80 Å R-free 0.251
1MPQ MALTOPORIN TREHALOSE COMPLEX Deposited 1997-03-24 Different ligand/ion Different experimental conditions Different structure-quality metrics Assembly 1 Other combination Homooligomer；Protein × 3 PDB declaration: trimeric
Chain A 26–446（421 aa）
Chain B 26–446（421 aa）
Chain C 26–446（421 aa）
Not recorded No recorded non-water small molecule X-RAY DIFFRACTION
X-ray crystallization conditions pH 7；pH 7.
Resolution 3.00 Å R-free 0.241

5 other PDB entries and 5 assemblies. Open the comparison page and filter oligomeric states

View Construct and Data Evidence
UniProt name LAMB_ECOLI
Isoform —
PDB entities 1
Chains and sequence ranges Author chain A； PDBConstruct 1–421； UniProt 26–446 Author chain B； PDBConstruct 1–421； UniProt 26–446 Author chain C； PDBConstruct 1–421； UniProt 26–446

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.

SAXS scattering curve SAXS Profile

SAXS profile for 1mpn

P(r) Distance Distribution P(r) Distribution

P(r) distribution for 1mpn
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2. Structure Basics 2. Structure Basics

Entry ID entry_id1mpn
Deposition date deposition_date1996-01-11
Structure title titleMALTOPORIN MALTOTRIOSE COMPLEX
Keywords keywordsMEMBRANE PROTEIN, SUGAR TRANSPORT, SPECIFIC PORIN, BETA BARREL; MEMBRANE PROTEIN
Experimental Method methodX-RAY DIFFRACTION
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3. SAXS Parameters (CRYSOL theoretical calculation) 3. SAXS Parameters (CRYSOL)

Radius of gyration Rg (Guinier) rg_guinier34.04 Å
Radius of gyration Rg (electron density) rg_electron33.28 Å
Forward intensity I(0) i0346959000.00
Molecular weight molecular_weight143690.0 kDa
Excluded volume excluded_volume176650 ų
Envelope volume envelope_volume235240 ų
Hydration-shell volume shell_volume56184 ų
Envelope diameter envelope_diameter97.2 Å
Shell Rg shell_rg42.47 Å
Envelope Rg envelope_rg32.50 Å
Shape Rg shape_rg33.28 Å
Total Rg total_rg33.97 Å
Total atoms total_atoms10155
Residues n_residues1263
Spherical-harmonic order n_harmonics20
q range q_range— – 0.5000 Å−1
Data points n_points101
Shell type shell_typedirectional
Solvent electron density solvent_density0.3340 e/ų
Shell contrast contrast_shell0.0300 e/ų
CRYSOL version crysol_version4.1.3
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4. P(r) Distance Distribution (GNOM inversion) 4. P(r) Analysis (GNOM)

Maximum dimension Dmax dmax97.0 Å
Rg (real space) rg_real33.79 Å
Rg uncertainty (real space) rg_real_error0.56 Å
I(0) (real space) i0_real3.4700e+08
I(0) uncertainty (real space) i0_real_error5.6230e+06
Rg (reciprocal space) rg_reciprocal33.94 Å
I(0) (reciprocal space) i0_reciprocal347000000.0000
Solution quality estimate total_estimate0.9047
Solution quality rating solution_quality EXCELLENT a EXCELLENT solution
P(r) peaks n_peaks1
Primary peak position r_peak_primary43.4 Å
Skewness Skewness skewness-0.034
Kurtosis Kurtosis kurtosis-0.674
Angular range angular_range— – 0.2350 Å−1
Current regularization parameter α current_alpha0.0000
Highest regularization parameter α highest_alpha26710000.0000
Real-space data points n_real_points48
GNOM version gnom_version4.1.3
Quality Criteria quality_criteria AN1: 0.000; Oscil: 0.976; Stabil: 1.000; Sysdev: 1.000; Positv: 1.000; Valcen: 0.969; Smooth: 0.860
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5. Crystallography and Experiment 5. Crystallography & Experiment

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6. Entities and Polymers Entities & Polymers (3)

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7. Fold Classification (SCOP + CATH) 6 domains

SCOP 2.08 (3 domains)

Domain ID domain_idd1mpna_
Class classf — Membrane and cell surface proteins and peptides
Fold Fold foldf.4 — Transmembrane beta-barrels
Superfamily Superfamily superfamilyf.4.3 — Porins
Family Family familyf.4.3.2 — Maltoporin-like
Domain ID domain_idd1mpnb_
Class classf — Membrane and cell surface proteins and peptides
Fold Fold foldf.4 — Transmembrane beta-barrels
Superfamily Superfamily superfamilyf.4.3 — Porins
Family Family familyf.4.3.2 — Maltoporin-like
Domain ID domain_idd1mpnc_
Class classf — Membrane and cell surface proteins and peptides
Fold Fold foldf.4 — Transmembrane beta-barrels
Superfamily Superfamily superfamilyf.4.3 — Porins
Family Family familyf.4.3.2 — Maltoporin-like

CATH v4.4 (3 domains)

Domain ID domain_id1mpnA00
Class class2 — Mainly Beta
Architecture architecture40 — Beta Barrel
Topology topology170 — Maltoporin; Chain A
Homologous superfamily homologous superfamily10 — Porin, LamB type
Domain ID domain_id1mpnB00
Class class2 — Mainly Beta
Architecture architecture40 — Beta Barrel
Topology topology170 — Maltoporin; Chain A
Homologous superfamily homologous superfamily10 — Porin, LamB type
Domain ID domain_id1mpnC00
Class class2 — Mainly Beta
Architecture architecture40 — Beta Barrel
Topology topology170 — Maltoporin; Chain A
Homologous superfamily homologous superfamily10 — Porin, LamB type
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8. Citations (2)

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9. Files and Curves (10)