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

Refs: Structure 14, 1489-1498; Current opinion in structural biology 18, 358-365


126354, 3-crossover-4

Representatives:
e1oewA2[A:1-177]
nonrep
Image
Pymol
Jmol Links:
PDB,
SCOP,
CATH, PubMed,
DOI
ENDOTHIAPEPSIN ; ligands: SER,SO4,THR ; X-RAY DIFFRACTION 0.91Å
e1oewA3[A:178-329]
nonrep
Image
Pymol
Jmol Links:
PDB,
SCOP,
CATH, PubMed,
DOI
ENDOTHIAPEPSIN ; ligands: GOL,SER,SO4,THR ; X-RAY DIFFRACTION 0.91Å
e1wkrA2[A:1-169]
nonrep
Image
Pymol
Jmol Links:
PDB,
SCOP,
CATH, PubMed,
DOI
POLYPOROPEPSIN ; ligands: SO4 ; X-RAY DIFFRACTION 1.3Å
e3ohfB3[B:47P-183] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Beta-secretase 1 ; ligands: 3HF,IOD ; X-RAY DIFFRACTION 2.100Å
e3ohhA3[A:47P-183] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Beta-secretase 1 ; ligands: 3HH,GOL,SO4 ; X-RAY DIFFRACTION 2.010Å
e4b1eA3[A:499-183] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
BETA-SECRETASE 1 ; ligands: 6T6 ; X-RAY DIFFRACTION 1.95Å
e4i0iB3[B:4-189] Image Pymol Jmol Links: PDB, SCOP, CATH
BETA-SECRETASE 1 ; ligands: 957 ; X-RAY DIFFRACTION 2.2Å
e3ohfA3[A:47P-183] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Beta-secretase 1 ; ligands: 3HF,GOL ; X-RAY DIFFRACTION 2.100Å
e3r2fE3[E:-1-183] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Beta-secretase 1 ; ligands: PB0 ; X-RAY DIFFRACTION 2.529Å
e3skfB3[B:-1-183] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
BETA-SECRETASE 1 ; ligands: PB7 ; X-RAY DIFFRACTION 3.0Å
e4acxA3[A:501-183] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
BETA-SECRETASE 1 ; ligands: ACT,S8Z ; X-RAY DIFFRACTION 2.00Å
e4b1cA3[A:497-183] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
BETA-SECRETASE 1 ; ligands: 1B1,DMS ; X-RAY DIFFRACTION 1.95Å
e4b1dA3[A:499-183] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
BETA-SECRETASE 1 ; ligands: 6TG,ACT ; X-RAY DIFFRACTION 1.95Å
e3ohhB3[B:47P-183] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Beta-secretase 1 ; ligands: 3HH,GOL,SO4 ; X-RAY DIFFRACTION 2.010Å
e3skfA3[A:-1-183] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
BETA-SECRETASE 1 ; ligands: PB7 ; X-RAY DIFFRACTION 3.0Å
e3skgA3[A:-1-183] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
BETA-SECRETASE 1 ; ligands: PB8 ; X-RAY DIFFRACTION 2.88Å
e3skgD3[D:-1-183] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
BETA-SECRETASE 1 ; ligands: PB8 ; X-RAY DIFFRACTION 2.88Å
e4fslE3[E:47-231] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Beta-secretase 1 ; ligands: 0VB,IOD ; X-RAY DIFFRACTION 2.500Å
e4azyA3[A:499-183] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
BETA-SECRETASE 1 ; ligands: 7F3,ACT ; X-RAY DIFFRACTION 1.79Å
e4b00A3[A:499-183] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
BETA-SECRETASE 1 ; ligands: ACT,I6X ; X-RAY DIFFRACTION 1.83Å
e3r2fA3[A:-1-183] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Beta-secretase 1 ; ligands: PB0 ; X-RAY DIFFRACTION 2.529Å
e3r2fB3[B:-1-183] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Beta-secretase 1 ; ligands: PB0 ; X-RAY DIFFRACTION 2.529Å
e3r2fD3[D:-1-183] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Beta-secretase 1 ; ligands: PB0 ; X-RAY DIFFRACTION 2.529Å
e3skgE3[E:-1-183] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
BETA-SECRETASE 1 ; ligands: PB8 ; X-RAY DIFFRACTION 2.88Å
e4b05A3[A:498-183] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
BETA-SECRETASE 1 ; ligands: 32D,ACT,NA ; X-RAY DIFFRACTION 1.80Å
e2vieA3[A:62-244] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
BETA-SECRETASE 1 ; ligands: VG0 ; X-RAY DIFFRACTION 1.90Å
e3kyrC3[C:46P-183] Image Pymol Jmol Links: PDB, SCOP, CATH
BETA-SECRETASE 1 ; ligands: 038 ; X-RAY DIFFRACTION 2.6Å
e4dpiA3[A:47-231] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
BETA-SECRETASE 1 ; ligands: 0N1 ; X-RAY DIFFRACTION 1.9Å
e3udjA3[A:-1-183] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
BETA-SECRETASE 1 ; ligands: 092,EDO,PEG ; X-RAY DIFFRACTION 1.8Å
e4frjA3[A:-1-183] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
BETA-SECRETASE 1 ; ligands: DMS,DWB,GOL,IOD ; X-RAY DIFFRACTION 1.95Å
e3n4lB3[B:4-189] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
BETA-SECRETASE 1 ; ligands: 842 ; X-RAY DIFFRACTION 2.7Å
e4di2B3[B:-2-183] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
BETA-SECRETASE 1 ; ligands: 0K9,GOL ; X-RAY DIFFRACTION 2.0Å
e3udhA3[A:-1-183] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Beta-secretase 1 ; ligands: 091,EDO ; X-RAY DIFFRACTION 1.70Å
e3udkA3[A:-1-183] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Beta-secretase 1 ; ligands: 095,EDO,PEG,ZN ; X-RAY DIFFRACTION 2.500Å
e4exgA3[A:48-231] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
BETA-SECRETASE 1 ; ligands: 916 ; X-RAY DIFFRACTION 1.8Å
e3udnA3[A:-1-183] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Beta-secretase 1 ; ligands: 09B,EDO,PEG ; X-RAY DIFFRACTION 2.193Å
e3udyA3[A:-1-183] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Beta-secretase 1 ; ligands: 09G,EDO,PEG ; X-RAY DIFFRACTION 1.990Å
e3udrA3[A:-1-183] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Beta-secretase 1 ; ligands: 09F,EDO,PEG ; X-RAY DIFFRACTION 1.950Å
e3udmA3[A:-1-183] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Beta-secretase 1 ; ligands: 09A,PEG ; X-RAY DIFFRACTION 1.940Å
e4jpcA3[A:45-231] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
BETA-SECRETASE 1 ; ligands: 1M6 ; X-RAY DIFFRACTION 1.8Å
e4jp9A3[A:45-231] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
BETA-SECRETASE 1 ; ligands: 1M5,NI ; X-RAY DIFFRACTION 1.8Å
e3udpA3[A:-1-183] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Beta-secretase 1 ; ligands: 09D,EDO,PEG,ZN ; X-RAY DIFFRACTION 1.947Å
e4ha5B3[B:58-244] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
BETA-SECRETASE 1 ; ligands: 13W,TLA ; X-RAY DIFFRACTION 1.83Å
e4jpeA3[A:45-231] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
BETA-SECRETASE 1 ; ligands: 1M7 ; X-RAY DIFFRACTION 1.8Å
e3hw1B3[B:-4-183] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Beta-secretase 1 ; ligands: EV2 ; X-RAY DIFFRACTION 2.48Å
e4fs4B3[B:58-244] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
BETA-SECRETASE 1 ; ligands: H24,TLA ; X-RAY DIFFRACTION 1.74Å
e4gidD3[D:47-231] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
BETA-SECRETASE 1 ; ligands: 0GH,LPD ; X-RAY DIFFRACTION 2.0Å
e4ha5A3[A:58-244] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
BETA-SECRETASE 1 ; ligands: 13W,TLA ; X-RAY DIFFRACTION 1.83Å
e4gidB3[B:47-231] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
BETA-SECRETASE 1 ; ligands: 0GH,LPD ; X-RAY DIFFRACTION 2.0Å
e4fs4A3[A:58-244] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
BETA-SECRETASE 1 ; ligands: H24,TLA ; X-RAY DIFFRACTION 1.74Å
e4fm8A3[A:-1-183] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
BETA-SECRETASE 1 ; ligands: 0UQ,EDO ; X-RAY DIFFRACTION 1.9Å
e4gidC3[C:46-231] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
BETA-SECRETASE 1 ; ligands: 0GH,LPD ; X-RAY DIFFRACTION 2.0Å
e4djwA3[A:58-244] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
BETA-SECRETASE 1 ; ligands: 0KP,TLA ; X-RAY DIFFRACTION 1.9Å
e4djvB3[B:58-244] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
BETA-SECRETASE 1 ; ligands: 0KM,TLA ; X-RAY DIFFRACTION 1.73Å
e4djvA3[A:58-244] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
BETA-SECRETASE 1 ; ligands: 0KM,TLA ; X-RAY DIFFRACTION 1.73Å
e4djwB3[B:58-244] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
BETA-SECRETASE 1 ; ligands: 0KP,TLA ; X-RAY DIFFRACTION 1.9Å
e4h1eB3[B:57-244] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
BETA-SECRETASE 1 ; ligands: 10J ; X-RAY DIFFRACTION 1.9Å
e4h3jA3[A:58-244] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
BETA-SECRETASE 1 ; ligands: 10W,TLA ; X-RAY DIFFRACTION 1.6Å
e4djxA3[A:58-244] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
BETA-SECRETASE 1 ; ligands: 0KQ,TLA ; X-RAY DIFFRACTION 1.5Å
e4djyA3[A:58-244] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
BETA-SECRETASE 1 ; ligands: 0KR,TLA ; X-RAY DIFFRACTION 1.86Å
e3zovA3[A:57-244] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
BETA-SECRETASE 1 ; ligands: DMS,NA,WZV ; X-RAY DIFFRACTION 2.10Å
e4j1iA3[A:57-244] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Beta-secretase 1 ; ligands: 1HH,DMS,NA ; X-RAY DIFFRACTION 2.01Å
e4j1kA3[A:57-244] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Beta-secretase 1 ; ligands: 1HG,DMS,NA ; X-RAY DIFFRACTION 2.07Å
e3mskA3[A:-1-183] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Beta-secretase 1 ; ligands: EV4,GOL,IOD ; X-RAY DIFFRACTION 2.000Å
e3rviA3[A:-1-183] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
BETA-SECRETASE 1 ; ligands: GOL,IOD,RVI ; X-RAY DIFFRACTION 2.65Å
e3tprA3[A:-1-183] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Beta-secretase 1 ; ligands: 5HA,CL ; X-RAY DIFFRACTION 2.55Å
e4fslB3[B:47-231] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Beta-secretase 1 ; ligands: 0VB,IOD ; X-RAY DIFFRACTION 2.500Å
e4h3jB3[B:58-244] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
BETA-SECRETASE 1 ; ligands: 10W,TLA ; X-RAY DIFFRACTION 1.6Å
e4djyB3[B:58-244] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
BETA-SECRETASE 1 ; ligands: 0KR,TLA ; X-RAY DIFFRACTION 1.86Å
e4djxB3[B:58-244] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
BETA-SECRETASE 1 ; ligands: 0KQ,TLA ; X-RAY DIFFRACTION 1.5Å
e4j0tA3[A:57-244] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Beta-secretase 1 ; ligands: 6T9,DMS,NA ; X-RAY DIFFRACTION 2.05Å
e4j1cA3[A:57-244] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Beta-secretase 1 ; ligands: 1HO,DMS,NA ; X-RAY DIFFRACTION 2.01Å
e4j1hA3[A:57-244] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Beta-secretase 1 ; ligands: 1HJ,DMS,NA ; X-RAY DIFFRACTION 2.12Å
e2zjiA3[A:444-183] Image Pymol Jmol Links: PDB, SCOP, CATH
Beta-secretase 1 ; ligands: F1I ; X-RAY DIFFRACTION 2.3Å
e3h0bA3[A:446-183] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Beta-secretase 1 ; ligands: B35 ; X-RAY DIFFRACTION 2.700Å
e3h0bB3[B:445-183] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Beta-secretase 1 ; ligands: B35 ; X-RAY DIFFRACTION 2.700Å
e3in4A3[A:60-245] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
BETA-SECRETASE 1 ; ligands: BX2 ; X-RAY DIFFRACTION 2.3Å
e3msjA3[A:-3-183] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
BETA-SECRETASE 1 ; ligands: EV3,GOL ; X-RAY DIFFRACTION 1.8Å
e3rsxA3[A:-1-183] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
BETA-SECRETASE 1 ; ligands: IOD,RSV ; X-RAY DIFFRACTION 2.48Å
e3u6aA3[A:-2-183] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
BETA-SECRETASE 1 ; ligands: 18P,SO4 ; X-RAY DIFFRACTION 2.2Å
e4frsB3[B:57-244] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
BETA-SECRETASE 1 ; ligands: 0V6 ; X-RAY DIFFRACTION 1.7Å
e4fslD3[D:47-231] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Beta-secretase 1 ; ligands: 0VB,IOD ; X-RAY DIFFRACTION 2.500Å
e4bfdA3[A:57-244] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
BETA-SECRETASE 1 ; ligands: 8T3,DMS,NA ; X-RAY DIFFRACTION 2.30Å
e4friA3[A:-1-183] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
BETA-SECRETASE 1 ; ligands: DMS,DWA,IOD ; X-RAY DIFFRACTION 2.3Å
e2zdzA3[A:60-245] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
BETA-SECRETASE 1 ; ligands: 310 ; X-RAY DIFFRACTION 2.0Å
e2zjkB3[B:445-183] Image Pymol Jmol Links: PDB, SCOP, CATH
Beta-secretase 1 ; ligands: F1K ; X-RAY DIFFRACTION 2.8Å
e2zjkC3[C:444-183] Image Pymol Jmol Links: PDB, SCOP, CATH
Beta-secretase 1 ; ligands: F1K ; X-RAY DIFFRACTION 2.8Å
e3s2oA3[A:-1-183] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
BETA-SECRETASE 1 ; ligands: EV6,IOD ; X-RAY DIFFRACTION 2.6Å
e3rthA3[A:-1-183] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Beta-secretase 1 ; ligands: IOD,RTH ; X-RAY DIFFRACTION 2.700Å
e3rtnA3[A:-1-183] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
BETA-SECRETASE 1 ; ligands: GOL,IOD,RTN ; X-RAY DIFFRACTION 2.7Å
e4gidA3[A:47-231] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
BETA-SECRETASE 1 ; ligands: 0GH,LPD ; X-RAY DIFFRACTION 2.0Å
e4j1fA3[A:57-244] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Beta-secretase 1 ; ligands: 1HL,DMS,NA ; X-RAY DIFFRACTION 2.14Å
e4b70A3[A:502-183] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
BETA-SECRETASE 1 ; ligands: WM9 ; X-RAY DIFFRACTION 1.6Å
e4b72A3[A:499-183] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
BETA-SECRETASE 1 ; ligands: 2FB ; X-RAY DIFFRACTION 1.6Å
e3wb4A3[A:-1-183] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Beta-secretase 1 ; ligands: 0B3,GOL,IOD ; X-RAY DIFFRACTION 2.250Å
e4j0pA3[A:57-244] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Beta-secretase 1 ; ligands: 1H8,DMS,NA ; X-RAY DIFFRACTION 1.97Å
e4i11A3[A:58-244] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
BETA-SECRETASE 1 ; ligands: 1CH,ZN ; X-RAY DIFFRACTION 1.89Å
e2zjkA3[A:444-183] Image Pymol Jmol Links: PDB, SCOP, CATH
Beta-secretase 1 ; ligands: F1K ; X-RAY DIFFRACTION 2.8Å
e2zjnA3[A:445-183] Image Pymol Jmol Links: PDB, SCOP, CATH
BETA-SECRETASE 1 ; ligands: F1N ; X-RAY DIFFRACTION 2.7Å
e3lhgA3[A:60-245] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
BETA-SECRETASE 1 ; ligands: Z81 ; X-RAY DIFFRACTION 2.1Å
e3mslA3[A:-1-183] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
BETA-SECRETASE 1 ; ligands: EV5,IOD ; X-RAY DIFFRACTION 2.4Å
e4bekA3[A:57-244] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
BETA-SECRETASE 1 ; ligands: DMS,NA,XK0 ; X-RAY DIFFRACTION 2.39Å
e4b77A3[A:499-183] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
BETA-SECRETASE 1 ; ligands: 54M,DMS ; X-RAY DIFFRACTION 1.8Å
e4l7jA3[A:-1-183] Image Pymol Jmol Links: PDB, SCOP, CATHDOI
BETA-SECRETASE 1 ; ligands: 1W2,ACT ; X-RAY DIFFRACTION 1.65Å
e4i0dA3[A:60-244] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
BETA-SECRETASE 1 ; ligands: 1B7,ZN ; X-RAY DIFFRACTION 1.91Å
e3uflA3[A:445-183] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
BETA-SECRETASE 1 ; ligands: 508,GOL,SO4 ; X-RAY DIFFRACTION 1.9Å
e3fktA3[A:17-203] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Beta-secretase 1 ; ligands: SII ; X-RAY DIFFRACTION 1.900Å
e4djuB3[B:58-244] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
BETA-SECRETASE 1 ; ligands: 0KK,TLA ; X-RAY DIFFRACTION 1.8Å
e4j0yA3[A:57-244] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Beta-secretase 1 ; ligands: 1H6,DMS,NA ; X-RAY DIFFRACTION 1.77Å
e4j0zA3[A:57-244] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Beta-secretase 1 ; ligands: 1H5,DMS,NA ; X-RAY DIFFRACTION 2.02Å
e4l7hA3[A:-1-183] Image Pymol Jmol Links: PDB, SCOP, CATHDOI
BETA-SECRETASE 1 ; ligands: 1W1,ACT,DMS ; X-RAY DIFFRACTION 1.85Å
e4ivsA3[A:-3-183] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
BETA-SECRETASE 1 ; ligands: VSI ; X-RAY DIFFRACTION 2.64Å
e4ivtA3[A:-4-183] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
BETA-SECRETASE 1 ; ligands: SO4,VTI ; X-RAY DIFFRACTION 1.6Å
e3oozA3[A:61-245] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
BETA-SECRETASE 1 ; ligands: ZOO ; X-RAY DIFFRACTION 1.8Å
e3s7lA3[A:60-245] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
BETA-SECRETASE 1 ; ligands: 591 ; X-RAY DIFFRACTION 2.16Å
e3udqA3[A:-1-183] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Beta-secretase 1 ; ligands: 09E ; X-RAY DIFFRACTION 2.729Å
e4dh6A3[A:-1-183] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
BETA-SECRETASE 1 ; ligands: 0KN,GOL,IOD ; X-RAY DIFFRACTION 2.5Å
e4dpfA3[A:47-231] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
BETA-SECRETASE 1 ; ligands: 0LG ; X-RAY DIFFRACTION 1.8Å
e4fm7A3[A:-1-183] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
BETA-SECRETASE 1 ; ligands: 0UP,ZN ; X-RAY DIFFRACTION 1.56Å
e3dm6A3[A:46P-183] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
BETA-SECRETASE 1 ; ligands: 757,IPA ; X-RAY DIFFRACTION 2.6Å
e3indA3[A:60-245] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
BETA-SECRETASE 1 ; ligands: 593 ; X-RAY DIFFRACTION 2.25Å
e3ineA3[A:60-245] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
BETA-SECRETASE 1 ; ligands: X17 ; X-RAY DIFFRACTION 2.0Å
e3ixjC3[C:46-231] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
BETA-SECRETASE 1 ; ligands: 586 ; X-RAY DIFFRACTION 2.2Å
e3s7mA3[A:60-245] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
BETA-SECRETASE 1 ; ligands: 532 ; X-RAY DIFFRACTION 2.2Å
e3tpjA3[A:-4-183] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
BETA-SECRETASE 1 ; ligands: CL,SO4,URE ; X-RAY DIFFRACTION 1.61Å
e4lxaA3[A:46P-183] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Beta-secretase 1 ; ligands: 1YS ; X-RAY DIFFRACTION 1.950Å
e4lxmA3[A:46P-183] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Beta-secretase 1 ; ligands: 1YU ; X-RAY DIFFRACTION 2.300Å
e4lxmB3[B:46P-183] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Beta-secretase 1 ; ligands: 1YU ; X-RAY DIFFRACTION 2.300Å
e4dv9A3[A:-5-183] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Beta-secretase 1 ; ligands: SO4 ; X-RAY DIFFRACTION 2.076Å
e3dm6C3[C:46P-183] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
BETA-SECRETASE 1 ; ligands: 757,IPA ; X-RAY DIFFRACTION 2.6Å
e2zjmA3[A:445-183] Image Pymol Jmol Links: PDB, SCOP, CATH
Beta-secretase 1 ; ligands: F1M ; X-RAY DIFFRACTION 1.9Å
e2wf2A3[A:62-244] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
BETA-SECRETASE 1 ; ligands: ZY2 ; X-RAY DIFFRACTION
e3ixjB3[B:46-231] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
BETA-SECRETASE 1 ; ligands: 586 ; X-RAY DIFFRACTION 2.2Å
e3k5cB3[B:46P-183] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Beta-secretase 1 ; ligands: 0BI ; X-RAY DIFFRACTION 2.120Å
e3k5dB3[B:46P-183] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Beta-secretase 1 ; ligands: XLI ; X-RAY DIFFRACTION 2.90Å
e3k5gA3[A:46P-183] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Beta-secretase 1 ; ligands: BJC ; X-RAY DIFFRACTION 2.000Å
e3k5gC3[C:46P-183] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Beta-secretase 1 ; ligands: BJC ; X-RAY DIFFRACTION 2.000Å
e3i25A3[A:46P-183] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
BETA-SECRETASE 1 ; ligands: MV7 ; X-RAY DIFFRACTION 2.1Å
e3i25C3[C:46P-183] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
BETA-SECRETASE 1 ; ligands: MV7 ; X-RAY DIFFRACTION 2.1Å
e3ixkA3[A:46-231] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
BETA-SECRETASE 1 ; ligands: 929 ; X-RAY DIFFRACTION 2.5Å
e3ixkB3[B:46-231] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
BETA-SECRETASE 1 ; ligands: 929 ; X-RAY DIFFRACTION 2.5Å
e3nshA3[A:4-189] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
BETA-SECRETASE 1 ; ligands: 957 ; X-RAY DIFFRACTION 2.2Å
e3qbhB3[B:46P-183] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Beta-secretase 1 ; ligands: QBH ; X-RAY DIFFRACTION 2.240Å
e3tppA3[A:-4-183] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Beta-secretase 1 ; ligands: 5HA,CL,SO4,URE ; X-RAY DIFFRACTION 1.6Å
e4jooA3[A:45-231] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Beta-secretase 1 ; ligands: 1M4,NI ; X-RAY DIFFRACTION 1.8Å
e4ke0C3[C:-2-183] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
BETA-SECRETASE 1 ; ligands: 1R8 ; X-RAY DIFFRACTION 2.3Å
e4k8sC3[C:-2-183] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Beta-secretase 1 ; ligands: 1QT ; X-RAY DIFFRACTION 2.39Å
e4lxaB3[B:46P-183] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Beta-secretase 1 ; ligands: 1YS ; X-RAY DIFFRACTION 1.950Å
e4lxkA3[A:46P-183] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Beta-secretase 1 ; ligands: 1YT ; X-RAY DIFFRACTION 2.050Å
e4lxkB3[B:46P-183] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Beta-secretase 1 ; ligands: 1YT ; X-RAY DIFFRACTION 2.050Å
e4d8cC3[C:-2-176] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
BETA-SECRETASE 1 ; ligands: BXD ; X-RAY DIFFRACTION 2.07Å
e2irzA3[A:43P-183] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Beta-secretase 1 ; ligands: I02 ; X-RAY DIFFRACTION 1.8Å
e2is0A3[A:43P-183] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Beta-secretase 1 ; ligands: I03 ; X-RAY DIFFRACTION 2.200Å
e2ph6A3[A:45P-183] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Beta-secretase 1 ; ligands: 712,SO4 ; X-RAY DIFFRACTION 1.600Å
e2p8hA3[A:43P-183] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
BETA-SECRETASE 1 ; ligands: MY9 ; X-RAY DIFFRACTION 1.8Å
e2viyA3[A:62-244] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
BETA-SECRETASE 1 ; ligands: VG3 ; X-RAY DIFFRACTION
e2vj6A3[A:62-244] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
BETA-SECRETASE 1 ; ligands: VG5 ; X-RAY DIFFRACTION 1.80Å
e2vj7A3[A:62-244] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
BETA-SECRETASE 1 ; ligands: VG6 ; X-RAY DIFFRACTION 1.60Å
e2vnmA3[A:62-244] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
BETA-SECRETASE 1 ; ligands: CM8 ; X-RAY DIFFRACTION 1.79Å
e3duyA3[A:46P-183] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Beta-secretase 1 ; ligands: AFJ ; X-RAY DIFFRACTION 1.970Å
e3duyB3[B:46P-183] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Beta-secretase 1 ; ligands: AFJ ; X-RAY DIFFRACTION 1.970Å
e3duyC3[C:46P-183] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Beta-secretase 1 ; ligands: AFJ ; X-RAY DIFFRACTION 1.970Å
e3dv5A3[A:46P-183] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Beta-secretase 1 ; ligands: BAV ; X-RAY DIFFRACTION 2.10Å
e3dv5B3[B:46P-183] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Beta-secretase 1 ; ligands: BAV ; X-RAY DIFFRACTION 2.10Å
e3dv5C3[C:46P-183] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Beta-secretase 1 ; ligands: BAV ; X-RAY DIFFRACTION 2.10Å
e2wf4A3[A:62-244] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
BETA-SECRETASE 1 ; ligands: ZY4 ; X-RAY DIFFRACTION
e2wezA3[A:62-244] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
BETA-SECRETASE 1 ; ligands: ZYE ; X-RAY DIFFRACTION
e2wf0A3[A:62-244] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
BETA-SECRETASE 1 ; ligands: ZY0 ; X-RAY DIFFRACTION
e2wf3A3[A:62-244] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
BETA-SECRETASE 1 ; ligands: GOL,ZY3 ; X-RAY DIFFRACTION 2.08Å
e3iviC3[C:59-244] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
BETA-SECRETASE 1 ; ligands: 2LI,GOL,SO4 ; X-RAY DIFFRACTION 2.2Å
e3inhA3[A:60-245] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
BETA-SECRETASE 1 ; ligands: 569 ; X-RAY DIFFRACTION 1.8Å
e3ixjA3[A:46-231] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
BETA-SECRETASE 1 ; ligands: 586,SO4 ; X-RAY DIFFRACTION 2.2Å
e3k5cA3[A:46P-183] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Beta-secretase 1 ; ligands: 0BI ; X-RAY DIFFRACTION 2.120Å
e3k5dC3[C:46P-183] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Beta-secretase 1 ; ligands: XLI ; X-RAY DIFFRACTION 2.90Å
e3k5gB3[B:46P-183] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Beta-secretase 1 ; ligands: BJC ; X-RAY DIFFRACTION 2.000Å
e3i25B3[B:46P-183] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
BETA-SECRETASE 1 ; ligands: MV7 ; X-RAY DIFFRACTION 2.1Å
e2xfjA3[A:62-244] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
BETA-SECRETASE 1 ; ligands: VG5 ; X-RAY DIFFRACTION 1.80Å
e3n4lA3[A:4-189] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
BETA-SECRETASE 1 ; ligands: 842 ; X-RAY DIFFRACTION 2.7Å
e3pi5A3[A:46P-183] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Beta-secretase 1 ; ligands: 3P5 ; X-RAY DIFFRACTION 2.400Å
e3pi5B3[B:46P-183] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Beta-secretase 1 ; ligands: 3P5 ; X-RAY DIFFRACTION 2.400Å
e3tplB3[B:-4-183] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Beta-secretase 1 ; X-RAY DIFFRACTION 2.2Å
e4ke0A3[A:-4-183] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
BETA-SECRETASE 1 ; ligands: 1R8,GOL ; X-RAY DIFFRACTION 2.3Å
e4ke0B3[B:-2-183] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
BETA-SECRETASE 1 ; ligands: 1R8 ; X-RAY DIFFRACTION 2.3Å
e4k8sA3[A:-2-183] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Beta-secretase 1 ; ligands: 1QT ; X-RAY DIFFRACTION 2.39Å
e4k8sB3[B:-2-183] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Beta-secretase 1 ; ligands: 1QT ; X-RAY DIFFRACTION 2.39Å
e4k9hA3[A:-2-183] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
BETA-SECRETASE 1 ; ligands: 1QU ; X-RAY DIFFRACTION 2.29Å
e4k9hB3[B:-2-183] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
BETA-SECRETASE 1 ; ligands: 1QU ; X-RAY DIFFRACTION 2.29Å
e4lxaC3[C:46P-183] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Beta-secretase 1 ; ligands: 1YS ; X-RAY DIFFRACTION 1.950Å
e4lxkC3[C:46P-183] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Beta-secretase 1 ; ligands: 1YT ; X-RAY DIFFRACTION 2.050Å
e4lxmC3[C:46P-183] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Beta-secretase 1 ; ligands: 1YU ; X-RAY DIFFRACTION 2.300Å
e4ewoA3[A:48-231] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
BETA-SECRETASE 1 ; ligands: 996 ; X-RAY DIFFRACTION 1.8Å
e2oahA3[A:43P-183] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Beta-secretase 1 ; ligands: QIN ; X-RAY DIFFRACTION 1.8Å
e2vijA3[A:62-244] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
BETA-SECRETASE 1 ; ligands: C44 ; X-RAY DIFFRACTION
e2vizA3[A:62-244] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
BETA-SECRETASE 1 ; ligands: VG4 ; X-RAY DIFFRACTION
e2vj9A3[A:62-244] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
BETA-SECRETASE 1 ; ligands: VG7 ; X-RAY DIFFRACTION
e2ph8A3[A:45P-183] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Beta-secretase 1 ; ligands: 35A,SO4 ; X-RAY DIFFRACTION 1.700Å
e2qzlA3[A:444-183] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Beta-secretase 1 ; ligands: IXS ; X-RAY DIFFRACTION 1.8Å
e2qzkA3[A:-2-183] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Beta-secretase 1 ; ligands: I21 ; X-RAY DIFFRACTION 1.8Å
e2vnnA3[A:62-244] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
BETA-SECRETASE 1 ; ligands: CM7 ; X-RAY DIFFRACTION 1.87Å
e3dv1B3[B:46P-183] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Beta-secretase 1 ; ligands: AR9 ; X-RAY DIFFRACTION 2.10Å
e2wf1A3[A:62-244] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
BETA-SECRETASE 1 ; ligands: ZY1 ; X-RAY DIFFRACTION
e3iviA3[A:59-244] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
BETA-SECRETASE 1 ; ligands: 2LI,GOL,SO4 ; X-RAY DIFFRACTION 2.2Å
e3iviB3[B:59-244] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
BETA-SECRETASE 1 ; ligands: 2LI,GOL,SO4 ; X-RAY DIFFRACTION 2.2Å
Previous Nexte1wkrA3[A:170-340]
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POLYPOROPEPSIN ; ligands: SO4 ; X-RAY DIFFRACTION 1.3Å
e2qp8A2[A:245-447]
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Beta-secretase 1 ; ligands: SC7 ; X-RAY DIFFRACTION 1.500Å
e2qp8A3[A:58-244]
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Beta-secretase 1 ; ligands: SC7,TAR ; X-RAY DIFFRACTION 1.500Å
e2bjuA2[A:1-177]
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PLASMEPSIN II ; ligands: IH4 ; X-RAY DIFFRACTION 1.56Å
e2bjuA3[A:178-329]
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PLASMEPSIN II ; ligands: IH4 ; X-RAY DIFFRACTION 1.56Å
e1dpjA2[A:0-147]
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PROTEINASE A ; ligands: NAG ; X-RAY DIFFRACTION 1.78Å
e1dpjA3[A:148-326]
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PROTEINASE A ; ligands: NAG,SO4 ; X-RAY DIFFRACTION 1.78Å
e1j71A1[A:1-179]
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Aspartic proteinase ; ligands: EOH ; X-RAY DIFFRACTION 1.8Å
e1j71A2[A:180-334]
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Aspartic proteinase ; ligands: EOH ; X-RAY DIFFRACTION 1.8Å
e3qvcA1[A:77P-328]
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HISTO-ASPARTIC PROTEASE ; ligands: EDO ; X-RAY DIFFRACTION 2.1Å
e4zl4A2[A:273-470]
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Aspartic protease PM5 ; ligands: 4PK,EDO,SO4 ; X-RAY DIFFRACTION 2.37Å
e4obz.1[C:-4-98,D:106-346]
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Cathepsin D heavy chain & Cathepsin D light chain ; ligands: NAG ; X-RAY DIFFRACTION 2.90Å
e1mppA1[A:-1-174]
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PEPSIN ; ligands: SO4 ; X-RAY DIFFRACTION
e1mppA2[A:175-332]
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PEPSIN ; X-RAY DIFFRACTION
e1smrA2[A:-2-174]
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RENIN ; X-RAY DIFFRACTION
e1smrA3[A:175-326]
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RENIN ; X-RAY DIFFRACTION

Pseudo group of domains that do not map to PFam family profiles. Domains inside should not be considered as in one family.
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
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