Evolutionary classification of protein domain structures
alpha arraysalpha-helix arrays with mainly perpendicular helices
alpha bundlesalpha-helix bundles with mainly parallel helices
alpha superhelicesrepeating alpha-helix hairpins form a superhelix
alpha duplicates or obligate multimersalpha duplicates or monomers associate together to form a compact domain
alpha complex topologyalpha domain with complex and unique topology that cannot be described as array or bundle or superhelix
beta barrelssingle beta-sheet folded upon itself to form a barrel
beta meanderssingle beta-sheet with mainly meander topology
beta sandwichestwo beta-sheets stacked together to form a sandwich
beta duplicates or obligate multimersbeta duplicates or monomers associate together to form a compact domain
beta complex topologybeta domains with complex and unique topology that cannot be described as barrel or sandwich or meander
a+b two layersone alpha-helix layer and one beta-sheet layer
a+b three layersone mainly antiparallel beta-sheet layer sandwiched between two alpha-helix layers
a+b four layerstwo beta-sheet layers sandwiched between two alpha-helix layers
a+b complex topologyalpha and beta domain with complex and unique topology that cannot be described in layers
a+b duplicates or obligate multimersalpha and beta duplicates or monomers associated together to form a compact domain
a/b barrelsrepeating beta-alpha units form a barrel
a/b three-layered sandwichesrepeating beta-alpha units form a sandwich with a mainly parallel beta-sheet layer stacked between two alpha-helix layers




Representatives:
e1nnfA2[A:1-100,A:226-308]
nonrep
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Iron-utilization periplasmic protein ; ligands: EDT ; X-RAY DIFFRACTION 1.10Å
e4exkA1[A:1-111,A:260-371]
nonrep
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Pymol
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Maltose-binding periplasmic protein, uncharacterized protein chimera ; ligands: MTT,PGE ; X-RAY DIFFRACTION 1.28Å
e4exkA3[A:112-259]
nonrep
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Pymol
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Maltose-binding periplasmic protein, uncharacterized protein chimera ; ligands: MTT ; X-RAY DIFFRACTION 1.28Å
e4zs9A1[A:49-165,A:324-432]
nonrep
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Pymol
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Sugar binding protein of ABC transporter system ; ligands: CL,MG,RAF ; X-RAY DIFFRACTION 1.37Å
e4zs9A2[A:166-323]
nonrep
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Sugar binding protein of ABC transporter system ; ligands: MG,RAF ; X-RAY DIFFRACTION 1.37Å
e1ursA2[A:142-285]
nonrep
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MALTOSE-BINDING PROTEIN ; ligands: MLR ; X-RAY DIFFRACTION 1.45Å
e1ursA3[A:30-141,A:286-395]
nonrep
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MALTOSE-BINDING PROTEIN ; ligands: MLR ; X-RAY DIFFRACTION 1.45Å
e5k2xA1[A:34-145,A:322-447]
nonrep
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Sugar ABC transporter permease ; ligands: EDO,IOD,MPD ; X-RAY DIFFRACTION 1.50Å
e5k2xA2[A:146-321]
nonrep
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Pymol
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Sugar ABC transporter permease ; ligands: IOD ; X-RAY DIFFRACTION 1.50Å
e1xvxA3[A:2-103,A:230-312]
nonrep
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YfuA ; ligands: EDO,FE,ZN ; X-RAY DIFFRACTION 1.53Å
e5cfvA3[A:2-370]
nonrep
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Maltose-binding periplasmic protein,Maltose-binding periplasmic protein,PilA fusion protein ; ligands: GOL,MG,MPD ; X-RAY DIFFRACTION 1.800Å
e1eu8A2[A:124-292]
nonrep
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TREHALOSE/MALTOSE BINDING PROTEIN ; ligands: CL,PT,TRE ; X-RAY DIFFRACTION 1.85Å
e1eu8A3[A:2-123,A:293-408]
nonrep
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TREHALOSE/MALTOSE BINDING PROTEIN ; ligands: CL,PT,TRE ; X-RAY DIFFRACTION 1.85Å
e1laxA2[A:1-111,A:260-369]
nonrep
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MALTOSE-BINDING PROTEIN MUTANT MALE31 ; X-RAY DIFFRACTION 1.85Å
e3a3cA3[A:3-111,A:260-370] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Maltose-binding periplasmic protein, LINKER, Mitochondrial intermembrane space import and assembly protein 40 ; ligands: MAL ; X-RAY DIFFRACTION 2.5Å
e1a7lA1[A:4-111,A:260-383I] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
MALE-B363 ; ligands: MAL ; X-RAY DIFFRACTION 2.9Å
e1a7lB1[B:4-111,B:260-141E] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
MALE-B363 ; ligands: MAL ; X-RAY DIFFRACTION 2.9Å
e1a7lC2[C:4-111,C:260-365I] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
MALE-B363 ; ligands: MAL ; X-RAY DIFFRACTION 2.9Å
e3c4mB2[B:-340--233,B:-84-22,B:29-30] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Fusion protein of Maltose-binding periplasmic protein and Parathyroid hormone/parathyroid hormone-related peptide receptor ; ligands: MAL ; X-RAY DIFFRACTION 1.95Å
e3d4cA3[A:5-112,A:261-371] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Maltose-binding periplasmic protein, LINKER, Zona pellucida protein 3 ; ligands: CD,MAL ; X-RAY DIFFRACTION 2.900Å
e3d4gA3[A:3-112,A:261-371] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Maltose-binding periplasmic protein, LINKER, Zona pellucida protein 3 ; ligands: CA,MAL ; X-RAY DIFFRACTION 2.300Å
e3d4gB3[B:3-112,B:261-371] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Maltose-binding periplasmic protein, LINKER, Zona pellucida protein 3 ; ligands: CA,MAL ; X-RAY DIFFRACTION 2.300Å
e3d4gC3[C:3-112,C:261-371] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Maltose-binding periplasmic protein, LINKER, Zona pellucida protein 3 ; ligands: CA,MAL ; X-RAY DIFFRACTION 2.300Å
e3d4gD1[D:5-112,D:261-371] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Maltose-binding periplasmic protein, LINKER, Zona pellucida protein 3 ; ligands: CA,MAL ; X-RAY DIFFRACTION 2.300Å
e3d4gE3[E:3-112,E:261-371] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Maltose-binding periplasmic protein, LINKER, Zona pellucida protein 3 ; ligands: CA,MAL ; X-RAY DIFFRACTION 2.300Å
e3d4gF1[F:3-112,F:261-371] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Maltose-binding periplasmic protein, LINKER, Zona pellucida protein 3 ; ligands: CA,MAL ; X-RAY DIFFRACTION 2.300Å
e3d4gG1[G:3-112,G:261-371] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Maltose-binding periplasmic protein, LINKER, Zona pellucida protein 3 ; ligands: CA,MAL ; X-RAY DIFFRACTION 2.300Å
e3d4gH3[H:5-112,H:261-371] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Maltose-binding periplasmic protein, LINKER, Zona pellucida protein 3 ; ligands: CA,MAL ; X-RAY DIFFRACTION 2.300Å
e3ef7A2[A:1-112,A:261-371] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Maltose-binding periplasmic protein, LINKER, Zona pellucida protein 3 ; ligands: CA,MAL,ZN ; X-RAY DIFFRACTION 3.100Å
e3ef7B1[B:1-112,B:261-371] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Maltose-binding periplasmic protein, LINKER, Zona pellucida protein 3 ; ligands: CA,MAL,ZN ; X-RAY DIFFRACTION 3.100Å
e3ehsA3[A:-348--238,A:-89-17] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
fusion protein of CRFR1 extracellular domain and MBP ; ligands: MAL ; X-RAY DIFFRACTION 2.75Å
e3ehuA1[A:-348--238,A:-89-17] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
FUSION PROTEIN OF CRFR1 EXTRACELLULAR DOMAIN AND MBP ; ligands: BTB,CA,MAL,PEG ; X-RAY DIFFRACTION 1.96Å
e3ehuB1[B:-348--238,B:-89-17] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
FUSION PROTEIN OF CRFR1 EXTRACELLULAR DOMAIN AND MBP ; ligands: BTB,CA,MAL,PEG ; X-RAY DIFFRACTION 1.96Å
e4gizA1[A:2-112,A:261-383] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Maltose-binding periplasmic protein, UBIQUITIN LIGASE EA6P: chimeric protein ; ligands: CEY ; X-RAY DIFFRACTION 2.550Å
e4gizB1[B:2-112,B:261-383] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Maltose-binding periplasmic protein, UBIQUITIN LIGASE EA6P: chimeric protein ; ligands: CEY ; X-RAY DIFFRACTION 2.550Å
e3h3gA2[A:-344--233,A:-84-22] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Fusion protein of Maltose-binding periplasmic domain and human parathyroid hormone receptor extracellular domain ; ligands: MAL ; X-RAY DIFFRACTION 1.94Å
e3hstA2[A:14-119,A:268-374] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Maltose-binding periplasmic protein ; ligands: EDO,MLR ; X-RAY DIFFRACTION 2.25Å
e3hstC2[C:10-119,C:268-374] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Maltose-binding periplasmic protein ; ligands: EDO,MLR,TAR ; X-RAY DIFFRACTION 2.25Å
e3jyrA2[A:1-111,A:260-370] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Maltose-binding periplasmic protein ; ligands: ACR ; X-RAY DIFFRACTION 1.750Å
e1laxC2[C:1-111,C:260-369] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
MALTOSE-BINDING PROTEIN MUTANT MALE31 ; X-RAY DIFFRACTION 1.85Å
e3lbsA2[A:4-111,A:260-375] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Maltose-binding periplasmic protein, Renin receptor ; ligands: MAL ; X-RAY DIFFRACTION 1.996Å
e3n94A1[A:-346--237,A:-88-18] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Fusion protein of Maltose-binding periplasmic protein and pituitary adenylate cyclase 1 Receptor-short ; ligands: MAL ; X-RAY DIFFRACTION 1.8Å
e1nmuA1[A:3-111,A:260-370] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
maltose-binding periplasmic protein ; ligands: MTT ; X-RAY DIFFRACTION 2.31Å
e1nmuC1[C:3-111,C:260-370] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
maltose-binding periplasmic protein ; ligands: MTT ; X-RAY DIFFRACTION 2.31Å
e3oaiA3[A:1-111,A:260-366] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Maltose-binding periplasmic protein, Myelin protein P0 ; ligands: MAL ; X-RAY DIFFRACTION 2.0Å
e3oaiB1[B:1-111,B:260-366] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Maltose-binding periplasmic protein, Myelin protein P0 ; ligands: MAL ; X-RAY DIFFRACTION 2.0Å
e3q28A1[A:1-112,A:261-386] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Maltose-binding periplasmic protein/alpha-synuclein chimeric protein ; ligands: MAL,SO4 ; X-RAY DIFFRACTION 1.600Å
e3q29A1[A:2-112,A:261-382] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Maltose-binding periplasmic protein/alpha-synuclein chimeric protein ; ligands: GOL,MAL,SO4 ; X-RAY DIFFRACTION 2.300Å
e1r6zP3[P:1-110,P:259-365] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Chimera of Maltose-binding periplasmic protein and Argonaute 2 ; ligands: MAL,NI ; X-RAY DIFFRACTION 2.8Å
e1r6zA2[A:1-110,A:259-365] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Chimera of Maltose-binding periplasmic protein and Argonaute 2 ; ligands: MAL,NI ; X-RAY DIFFRACTION 2.8Å
e1r6zZ2[Z:2-110,Z:259-365,Z:591-593] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Chimera of Maltose-binding periplasmic protein and Argonaute 2 ; ligands: MAL,NI ; X-RAY DIFFRACTION 2.8Å
e3rumA1[A:1-112,A:261-378] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Maltose-binding periplasmic protein ; ligands: IPA,MAL,MAN,RST,SO4 ; X-RAY DIFFRACTION 1.85Å
e1svxB2[B:5-111,B:260-373] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Maltose-binding periplasmic protein ; X-RAY DIFFRACTION 2.24Å
e1t0kA1[A:5-111,A:260-369] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Maltose-binding periplasmic protein ; ligands: MTT ; X-RAY DIFFRACTION 3.24Å
e2vgqA1[A:2-111,A:260-369] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Sugar ABC transporter substrate-binding protein,Mitochondrial antiviral-signaling protein ; ligands: MTT,SO4 ; X-RAY DIFFRACTION 2.10Å
e2xz3A1[A:29-137,A:286-397] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
MALTOSE ABC TRANSPORTER PERIPLASMIC PROTEIN, ENVELOPE GLYCOPROTEIN ; ligands: EDO,MAL ; X-RAY DIFFRACTION 1.95Å
e2zxtA1[A:3-111,A:260-370] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Maltose-binding periplasmic protein, LINKER, Mitochondrial intermembrane space import and assembly protein 40 ; ligands: MAL ; X-RAY DIFFRACTION 3Å
e4o4bA2[A:1-111,A:260-366] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
EXTRACELLULAR SOLUTE-BINDING PROTEIN FAMILY 1 ; X-RAY DIFFRACTION 1.8Å
e4r0yA3[A:1-111,A:260-363] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Maltose-binding periplasmic protein, Disks large-associated protein 1 ; X-RAY DIFFRACTION 2.0Å
e4jkmD1[D:18-120,D:269-375] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Maltose-binding periplasmic protein ; X-RAY DIFFRACTION 2.26Å
e4wgiA1[A:-196--85,A:64-170] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Maltose-binding periplasmic protein,Induced myeloid leukemia cell differentiation protein Mcl-1 ; ligands: FMT,MAL,MG ; X-RAY DIFFRACTION 1.850Å
e4pe2A2[A:2-111,A:260-370] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Maltose ABC transporter periplasmic protein,Prepilin-type N-terminal cleavage/methylation domain protein ; ligands: MAL ; X-RAY DIFFRACTION 1.720Å
e4tsmA4[A:0-111,A:260-370] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
maltose-binding protein, pilin chimera ; ligands: MTT,TMO ; X-RAY DIFFRACTION 1.899Å
e4tsmC3[C:0-111,C:260-370] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
maltose-binding protein, pilin chimera ; ligands: MTT,TMO ; X-RAY DIFFRACTION 1.899Å
e3h4zA2[A:1-113,A:262-1024] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Maltose-binding periplasmic protein fused with Allergen DERP7 ; ligands: NA ; X-RAY DIFFRACTION 2.35Å
e3h4zB2[B:1-113,B:262-1023] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Maltose-binding periplasmic protein fused with Allergen DERP7 ; X-RAY DIFFRACTION 2.35Å
e3q26A2[A:2-112,A:261-375] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Maltose-binding periplasmic protein/alpha-synuclein chimeric protein ; ligands: GOL,MAL,SO4 ; X-RAY DIFFRACTION 1.540Å
e1laxA3[A:112-259]
nonrep
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MALTOSE-BINDING PROTEIN MUTANT MALE31 ; X-RAY DIFFRACTION 1.85Å
e3waiA1[A:1-111,A:260-366]
nonrep
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Maltose-binding periplasmic protein, Transmembrane oligosaccharyl transferase ; X-RAY DIFFRACTION 1.897Å
e3waiA4[A:112-259]
nonrep
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Maltose-binding periplasmic protein, Transmembrane oligosaccharyl transferase ; X-RAY DIFFRACTION 1.897Å
e4tsmB1[B:1-111,B:260-370]
nonrep
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maltose-binding protein, pilin chimera ; ligands: MTT,TMO ; X-RAY DIFFRACTION 1.899Å
e4tsmB3[B:112-259]
nonrep
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maltose-binding protein, pilin chimera ; ligands: MTT ; X-RAY DIFFRACTION 1.899Å
e1y4cA1[A:4-111,A:260-370]
nonrep
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Maltose binding protein fused with designed helical protein ; X-RAY DIFFRACTION 1.9Å
e1y4cA2[A:112-259]
nonrep
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Maltose binding protein fused with designed helical protein ; X-RAY DIFFRACTION 1.9Å
e3q25A1[A:3-110,A:261-367]
nonrep
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Maltose-binding periplasmic protein/alpha-synuclein chimeric protein ; ligands: GOL,MAL,SO4 ; X-RAY DIFFRACTION 1.900Å
e3q25A2[A:111-260]
nonrep
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Maltose-binding periplasmic protein/alpha-synuclein chimeric protein ; ligands: GOL,MAL,SO4 ; X-RAY DIFFRACTION 1.900Å
e3thiA3[A:9-113,A:270-370]
nonrep
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PROTEIN (THIAMINASE I) ; ligands: SO4 ; X-RAY DIFFRACTION 2.0Å
e5gppA2[A:2-114,A:263-370]
nonrep
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Maltose-binding periplasmic protein,Apoptosis-associated speck-like protein containing a CARD ; ligands: ACT,MAL,SO4 ; X-RAY DIFFRACTION 2.0Å
e1pc3A2[A:105-290]
nonrep
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PHOSPHATE-BINDING PROTEIN 1 ; ligands: PO4 ; X-RAY DIFFRACTION 2.16Å
e3py7A1[A:3-112,A:261-370]
nonrep
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maltose-binding periplasmic protein,paxillin LD1,protein E6 chimera ; ligands: MLR ; X-RAY DIFFRACTION 2.288Å
e3py7A4[A:113-260]
nonrep
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maltose-binding periplasmic protein,paxillin LD1,protein E6 chimera ; ligands: MLR ; X-RAY DIFFRACTION 2.288Å
e4dxbA1[A:1-111,A:260-318,A:586-637]
nonrep
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Maltose-binding periplasmic protein, Beta-lactamase TEM chimera ; X-RAY DIFFRACTION 2.29Å
e4dxbA4[A:112-259]
nonrep
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Maltose-binding periplasmic protein, Beta-lactamase TEM chimera ; ligands: ZN ; X-RAY DIFFRACTION 2.29Å
e4jbzA1[A:1-110,A:261-367]
nonrep
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MALTOSE-BINDING PERIPLASMIC PROTEIN FUSED WITH XENOPUS LAEVIS MCM10 COILED-COIL REGION ; ligands: MAL ; X-RAY DIFFRACTION 2.4Å
e4jbzA2[A:111-260]
nonrep
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MALTOSE-BINDING PERIPLASMIC PROTEIN FUSED WITH XENOPUS LAEVIS MCM10 COILED-COIL REGION ; ligands: MAL ; X-RAY DIFFRACTION 2.4Å
e4b3nA1[A:5-110,A:261-374]
nonrep
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MALTOSE-BINDING PERIPLASMIC PROTEIN, TRIPARTITE MOTIF-CONTAINING PROTEIN 5 ; ligands: MAL ; X-RAY DIFFRACTION 3.30Å
e4b3nA3[A:111-260]
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MALTOSE-BINDING PERIPLASMIC PROTEIN, TRIPARTITE MOTIF-CONTAINING PROTEIN 5 ; ligands: MAL ; X-RAY DIFFRACTION 3.30Å
e4pqkB1[B:2-110,B:261-367]
nonrep
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Maltose ABC transporter periplasmic protein, Truncated replication protein RepA ; ligands: MLR ; X-RAY DIFFRACTION 3.400Å
e4pqkB3[B:111-260]
nonrep
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Maltose ABC transporter periplasmic protein, Truncated replication protein RepA ; ligands: MLR ; X-RAY DIFFRACTION 3.400Å
e4blaD1[D:5-112,D:261-368]
nonrep
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MALTOSE-BINDING PERIPLASMIC PROTEIN, SUPPRESSOR OF FUSED HOMOLOG ; X-RAY DIFFRACTION 3.50Å

Pseudo group of domains that do not map to PFam family profiles. Domains inside should not be considered as in one family.
mixed a+b and a/balpha and beta domain consists of both a+b and a/b regions
few secondary structure elementsstabilized by cofactors or disulfides
extended segmentsextended, non-globular segments, frequently bind to other proteins to form complexes