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(-) Description

Title :  CRYSTAL STRUCTURES EXPLORING THE ORIGINS OF THE BROADER SPECIFICITY OF ESCHERICHIA COLI HEAT-LABILE ENTEROTOXIN COMPARED TO CHOLERA TOXIN
 
Authors :  A. Holmner, A. Mackenzie, M. Okvist, L. Jansson, M. Lebens, S. Teneberg U. Krengel
Date :  19 Sep 10  (Deposition) - 08 Dec 10  (Release) - 01 Apr 15  (Revision)
Method :  X-RAY DIFFRACTION
Resolution :  2.40
Chains :  Asym./Biol. Unit :  D,E,F,G,H
Keywords :  Toxin, Host-Pathogen Interactions, Molecular Recognition, Protein-Carbohydrate Interaction (Keyword Search: [Gene Ontology, PubMed, Web (Google))
 
Reference :  A. Holmner, A. Mackenzie, M. Okvist, L. Jansson, M. Lebens, S. Teneberg, U. Krengel
Crystal Structures Exploring The Origins Of The Broader Specificity Of Escherichia Coli Heat-Labile Enterotoxin Compared To Cholera Toxin
J. Mol. Biol. V. 406 387 2011
PubMed-ID: 21168418  |  Reference-DOI: 10.1016/J.JMB.2010.11.060

(-) Compounds

Molecule 1 - HEAT-LABILE ENTEROTOXIN B CHAIN
    ChainsD, E, F, G, H
    EngineeredYES
    Expression SystemVIBRIO CHOLERAE
    Expression System PlasmidPMLPLTBTAC
    Expression System StrainJS1569
    Expression System Taxid666
    Expression System Vector TypePLASMID
    FragmentRESIDUES 22-124
    Organism ScientificESCHERICHIA COLI
    Organism Taxid562
    Other DetailsPORCINE ENTEROTOXIN PLT B-SUBUNIT CONTAINING GM1 PENTASACCHARIDE(GAL-BETA3-GALNAC-BETA4 (NEUAC ALPHA3)-GAL-BETA4 -GLC
    SynonymLTH-B

 Structural Features

(-) Chains, Units

  12345
Asymmetric/Biological Unit DEFGH

Summary Information (see also Sequences/Alignments below)

(-) Ligands, Modified Residues, Ions  (4, 25)

Asymmetric/Biological Unit (4, 25)
No.NameCountTypeFull Name
1BGC5Ligand/IonBETA-D-GLUCOSE
2GAL10Ligand/IonBETA-D-GALACTOSE
3NGA5Ligand/IonN-ACETYL-D-GALACTOSAMINE
4SIA5Ligand/IonO-SIALIC ACID

(-) Sites  (5, 5)

Asymmetric Unit (5, 5)
No.NameEvidenceResiduesDescription
1AC1SOFTWAREGLU D:11 , TYR D:12 , ARG D:13 , GLU D:51 , GLN D:56 , GLN D:61 , TRP D:88 , ASN D:90 , LYS D:91 , GLY E:33BINDING SITE FOR CHAIN D OF POLYSACCHARIDE RESIDUES 1104 TO 1108
2AC2SOFTWAREGLU E:11 , TYR E:12 , ARG E:13 , GLU E:51 , GLN E:56 , ILE E:58 , GLN E:61 , TRP E:88 , ASN E:90 , LYS E:91 , HOH E:2030 , LYS H:63BINDING SITE FOR CHAIN E OF POLYSACCHARIDE RESIDUES 1104 TO 1108
3AC3SOFTWAREGLU F:11 , TYR F:12 , ARG F:13 , GLU F:51 , GLN F:56 , ILE F:58 , GLN F:61 , TRP F:88 , ASN F:90 , LYS F:91 , HOH F:2002BINDING SITE FOR CHAIN F OF POLYSACCHARIDE RESIDUES 1104 TO 1108
4AC4SOFTWAREGLU G:11 , TYR G:12 , ARG G:13 , GLU G:51 , GLN G:56 , ILE G:58 , GLN G:61 , TRP G:88 , ASN G:90 , LYS G:91 , GLY H:33BINDING SITE FOR CHAIN G OF POLYSACCHARIDE RESIDUES 1104 TO 1108
5AC5SOFTWAREGLY D:33 , PRO D:53 , SER D:55 , HOH D:2011 , GLU H:11 , TYR H:12 , ARG H:13 , GLU H:51 , GLN H:56 , ILE H:58 , GLN H:61 , TRP H:88 , ASN H:90 , LYS H:91 , HOH H:2018BINDING SITE FOR CHAIN H OF POLYSACCHARIDE RESIDUES 1104 TO 1108

(-) SS Bonds  (5, 5)

Asymmetric/Biological Unit
No.Residues
1D:9 -D:86
2E:9 -E:86
3F:9 -F:86
4G:9 -G:86
5H:9 -H:86

(-) Cis Peptide Bonds  (5, 5)

Asymmetric/Biological Unit
No.Residues
1Thr D:92 -Pro D:93
2Thr E:92 -Pro E:93
3Thr F:92 -Pro F:93
4Thr G:92 -Pro G:93
5Thr H:92 -Pro H:93

 Sequence-Structure Mapping

(-) SAPs(SNPs)/Variants  (1, 5)

Asymmetric/Biological Unit (1, 5)
  dbSNPPDB
No.SourceVariant IDVariantUniProt IDStatusIDChainVariant
1UniProtVAR_ELBP_ECOLX_001 *T96AELBP_ECOLX  ---  ---D/E/F/G/HT75A
   * ID not provided by source

  SNP/SAP Summary Statistics (UniProtKB/Swiss-Prot)

(-) PROSITE Motifs  (0, 0)

(no "PROSITE Motif" information available for 2XRQ)

(-) Exons   (0, 0)

(no "Exon" information available for 2XRQ)

(-) Sequences/Alignments

Asymmetric/Biological Unit
   Reformat: Number of residues per line =  ('0' or empty: single-line sequence representation)
  Number of residues per labelling interval =   
  UniProt sequence: complete  aligned part    
   Show mapping: SCOP domains CATH domains Pfam domains Secondary structure (by author)
SAPs(SNPs) PROSITE motifs Exons
(details for a mapped element are shown in a popup box when the mouse pointer rests over it)
Chain D from PDB  Type:PROTEIN  Length:103
 aligned with ELBP_ECOLX | P32890 from UniProtKB/Swiss-Prot  Length:124

    Alignment length:103
                                    31        41        51        61        71        81        91       101       111       121   
           ELBP_ECOLX    22 APQTITELCSEYRNTQIYTINDKILSYTESMAGKREMVIITFKSGETFQVEVPGSQHIDSQKKAIERMKDTLRITYLTETKIDKLCVWNNKTPNSIAAISMKN 124
               SCOP domains d2xrqd_ D: Heat-labile toxin                                                                            SCOP domains
               CATH domains ------------------------------------------------------------------------------------------------------- CATH domains
               Pfam domains ------------------------------------------------------------------------------------------------------- Pfam domains
         Sec.struct. author ...hhhhhhh....eeeeeeee...eeeeeee..eeeeeee.....eeee.........hhhhhhhhhhhhhhhhhhhh..eeeeeee.....eeeeeeeee. Sec.struct. author
                 SAPs(SNPs) --------------------------------------------------------------------------A---------------------------- SAPs(SNPs)
                    PROSITE ------------------------------------------------------------------------------------------------------- PROSITE
                 Transcript ------------------------------------------------------------------------------------------------------- Transcript
                 2xrq D   1 APQTITELCSEYRNTQIYTINDKILSYTESMAGKREMVIITFKSGETFQVEVPGSQHIDSQKKAIERMKDTLRITYLTETKIDKLCVWNNKTPNSIAAISMKN 103
                                    10        20        30        40        50        60        70        80        90       100   

Chain D from PDB  Type:PROTEIN  Length:103
 aligned with Q0PRR7_ECOLX | Q0PRR7 from UniProtKB/TrEMBL  Length:124

    Alignment length:103
                                    31        41        51        61        71        81        91       101       111       121   
         Q0PRR7_ECOLX    22 APQTITELCSEYRNTQIYTINDKILSYTESMAGKREMVIITFKSGETFQVEVPGSQHIDSQKKAIERMKDTLRITYLTETKIDKLCVWNNKTPNSIAAISMKN 124
               SCOP domains d2xrqd_ D: Heat-labile toxin                                                                            SCOP domains
               CATH domains ------------------------------------------------------------------------------------------------------- CATH domains
               Pfam domains ------------------------------------------------------------------------------------------------------- Pfam domains
         Sec.struct. author ...hhhhhhh....eeeeeeee...eeeeeee..eeeeeee.....eeee.........hhhhhhhhhhhhhhhhhhhh..eeeeeee.....eeeeeeeee. Sec.struct. author
                 SAPs(SNPs) --------------------------------------------------------------------------A---------------------------- SAPs(SNPs)
                    PROSITE ------------------------------------------------------------------------------------------------------- PROSITE
                 Transcript ------------------------------------------------------------------------------------------------------- Transcript
                 2xrq D   1 APQTITELCSEYRNTQIYTINDKILSYTESMAGKREMVIITFKSGETFQVEVPGSQHIDSQKKAIERMKDTLRITYLTETKIDKLCVWNNKTPNSIAAISMKN 103
                                    10        20        30        40        50        60        70        80        90       100   

Chain E from PDB  Type:PROTEIN  Length:103
 aligned with ELBP_ECOLX | P32890 from UniProtKB/Swiss-Prot  Length:124

    Alignment length:103
                                    31        41        51        61        71        81        91       101       111       121   
           ELBP_ECOLX    22 APQTITELCSEYRNTQIYTINDKILSYTESMAGKREMVIITFKSGETFQVEVPGSQHIDSQKKAIERMKDTLRITYLTETKIDKLCVWNNKTPNSIAAISMKN 124
               SCOP domains d2xrqe_ E: Heat-labile toxin                                                                            SCOP domains
               CATH domains ------------------------------------------------------------------------------------------------------- CATH domains
               Pfam domains ------------------------------------------------------------------------------------------------------- Pfam domains
         Sec.struct. author ...hhhhhhh....eeeeeeee...eeeeeee..eeeeeee.....eeee.........hhhhhhhhhhhhhhhhhhhh..eeeeeee......eeeeeeee. Sec.struct. author
                 SAPs(SNPs) --------------------------------------------------------------------------A---------------------------- SAPs(SNPs)
                    PROSITE ------------------------------------------------------------------------------------------------------- PROSITE
                 Transcript ------------------------------------------------------------------------------------------------------- Transcript
                 2xrq E   1 APQTITELCSEYRNTQIYTINDKILSYTESMAGKREMVIITFKSGETFQVEVPGSQHIDSQKKAIERMKDTLRITYLTETKIDKLCVWNNKTPNSIAAISMKN 103
                                    10        20        30        40        50        60        70        80        90       100   

Chain E from PDB  Type:PROTEIN  Length:103
 aligned with Q0PRR7_ECOLX | Q0PRR7 from UniProtKB/TrEMBL  Length:124

    Alignment length:103
                                    31        41        51        61        71        81        91       101       111       121   
         Q0PRR7_ECOLX    22 APQTITELCSEYRNTQIYTINDKILSYTESMAGKREMVIITFKSGETFQVEVPGSQHIDSQKKAIERMKDTLRITYLTETKIDKLCVWNNKTPNSIAAISMKN 124
               SCOP domains d2xrqe_ E: Heat-labile toxin                                                                            SCOP domains
               CATH domains ------------------------------------------------------------------------------------------------------- CATH domains
               Pfam domains ------------------------------------------------------------------------------------------------------- Pfam domains
         Sec.struct. author ...hhhhhhh....eeeeeeee...eeeeeee..eeeeeee.....eeee.........hhhhhhhhhhhhhhhhhhhh..eeeeeee......eeeeeeee. Sec.struct. author
                 SAPs(SNPs) --------------------------------------------------------------------------A---------------------------- SAPs(SNPs)
                    PROSITE ------------------------------------------------------------------------------------------------------- PROSITE
                 Transcript ------------------------------------------------------------------------------------------------------- Transcript
                 2xrq E   1 APQTITELCSEYRNTQIYTINDKILSYTESMAGKREMVIITFKSGETFQVEVPGSQHIDSQKKAIERMKDTLRITYLTETKIDKLCVWNNKTPNSIAAISMKN 103
                                    10        20        30        40        50        60        70        80        90       100   

Chain F from PDB  Type:PROTEIN  Length:103
 aligned with ELBP_ECOLX | P32890 from UniProtKB/Swiss-Prot  Length:124

    Alignment length:103
                                    31        41        51        61        71        81        91       101       111       121   
           ELBP_ECOLX    22 APQTITELCSEYRNTQIYTINDKILSYTESMAGKREMVIITFKSGETFQVEVPGSQHIDSQKKAIERMKDTLRITYLTETKIDKLCVWNNKTPNSIAAISMKN 124
               SCOP domains d2xrqf_ F: Heat-labile toxin                                                                            SCOP domains
               CATH domains ------------------------------------------------------------------------------------------------------- CATH domains
               Pfam domains ------------------------------------------------------------------------------------------------------- Pfam domains
         Sec.struct. author ...hhhhhhh....eeeeeeee...eeeeeee..eeeeeee.....eeee.........hhhhhhhhhhhhhhhhhhhh..eeeeeee.....eeeeeeeee. Sec.struct. author
                 SAPs(SNPs) --------------------------------------------------------------------------A---------------------------- SAPs(SNPs)
                    PROSITE ------------------------------------------------------------------------------------------------------- PROSITE
                 Transcript ------------------------------------------------------------------------------------------------------- Transcript
                 2xrq F   1 APQTITELCSEYRNTQIYTINDKILSYTESMAGKREMVIITFKSGETFQVEVPGSQHIDSQKKAIERMKDTLRITYLTETKIDKLCVWNNKTPNSIAAISMKN 103
                                    10        20        30        40        50        60        70        80        90       100   

Chain F from PDB  Type:PROTEIN  Length:103
 aligned with Q0PRR7_ECOLX | Q0PRR7 from UniProtKB/TrEMBL  Length:124

    Alignment length:103
                                    31        41        51        61        71        81        91       101       111       121   
         Q0PRR7_ECOLX    22 APQTITELCSEYRNTQIYTINDKILSYTESMAGKREMVIITFKSGETFQVEVPGSQHIDSQKKAIERMKDTLRITYLTETKIDKLCVWNNKTPNSIAAISMKN 124
               SCOP domains d2xrqf_ F: Heat-labile toxin                                                                            SCOP domains
               CATH domains ------------------------------------------------------------------------------------------------------- CATH domains
               Pfam domains ------------------------------------------------------------------------------------------------------- Pfam domains
         Sec.struct. author ...hhhhhhh....eeeeeeee...eeeeeee..eeeeeee.....eeee.........hhhhhhhhhhhhhhhhhhhh..eeeeeee.....eeeeeeeee. Sec.struct. author
                 SAPs(SNPs) --------------------------------------------------------------------------A---------------------------- SAPs(SNPs)
                    PROSITE ------------------------------------------------------------------------------------------------------- PROSITE
                 Transcript ------------------------------------------------------------------------------------------------------- Transcript
                 2xrq F   1 APQTITELCSEYRNTQIYTINDKILSYTESMAGKREMVIITFKSGETFQVEVPGSQHIDSQKKAIERMKDTLRITYLTETKIDKLCVWNNKTPNSIAAISMKN 103
                                    10        20        30        40        50        60        70        80        90       100   

Chain G from PDB  Type:PROTEIN  Length:103
 aligned with ELBP_ECOLX | P32890 from UniProtKB/Swiss-Prot  Length:124

    Alignment length:103
                                    31        41        51        61        71        81        91       101       111       121   
           ELBP_ECOLX    22 APQTITELCSEYRNTQIYTINDKILSYTESMAGKREMVIITFKSGETFQVEVPGSQHIDSQKKAIERMKDTLRITYLTETKIDKLCVWNNKTPNSIAAISMKN 124
               SCOP domains d2xrqg_ G: Heat-labile toxin                                                                            SCOP domains
               CATH domains ------------------------------------------------------------------------------------------------------- CATH domains
               Pfam domains ------------------------------------------------------------------------------------------------------- Pfam domains
         Sec.struct. author ...hhhhhhh....eeeeeeee...eeeeeee..eeeeeee.....eeee.........hhhhhhhhhhhhhhhhhhh...eeeeeee.....eeeeeeeee. Sec.struct. author
                 SAPs(SNPs) --------------------------------------------------------------------------A---------------------------- SAPs(SNPs)
                    PROSITE ------------------------------------------------------------------------------------------------------- PROSITE
                 Transcript ------------------------------------------------------------------------------------------------------- Transcript
                 2xrq G   1 APQTITELCSEYRNTQIYTINDKILSYTESMAGKREMVIITFKSGETFQVEVPGSQHIDSQKKAIERMKDTLRITYLTETKIDKLCVWNNKTPNSIAAISMKN 103
                                    10        20        30        40        50        60        70        80        90       100   

Chain G from PDB  Type:PROTEIN  Length:103
 aligned with Q0PRR7_ECOLX | Q0PRR7 from UniProtKB/TrEMBL  Length:124

    Alignment length:103
                                    31        41        51        61        71        81        91       101       111       121   
         Q0PRR7_ECOLX    22 APQTITELCSEYRNTQIYTINDKILSYTESMAGKREMVIITFKSGETFQVEVPGSQHIDSQKKAIERMKDTLRITYLTETKIDKLCVWNNKTPNSIAAISMKN 124
               SCOP domains d2xrqg_ G: Heat-labile toxin                                                                            SCOP domains
               CATH domains ------------------------------------------------------------------------------------------------------- CATH domains
               Pfam domains ------------------------------------------------------------------------------------------------------- Pfam domains
         Sec.struct. author ...hhhhhhh....eeeeeeee...eeeeeee..eeeeeee.....eeee.........hhhhhhhhhhhhhhhhhhh...eeeeeee.....eeeeeeeee. Sec.struct. author
                 SAPs(SNPs) --------------------------------------------------------------------------A---------------------------- SAPs(SNPs)
                    PROSITE ------------------------------------------------------------------------------------------------------- PROSITE
                 Transcript ------------------------------------------------------------------------------------------------------- Transcript
                 2xrq G   1 APQTITELCSEYRNTQIYTINDKILSYTESMAGKREMVIITFKSGETFQVEVPGSQHIDSQKKAIERMKDTLRITYLTETKIDKLCVWNNKTPNSIAAISMKN 103
                                    10        20        30        40        50        60        70        80        90       100   

Chain H from PDB  Type:PROTEIN  Length:103
 aligned with ELBP_ECOLX | P32890 from UniProtKB/Swiss-Prot  Length:124

    Alignment length:103
                                    31        41        51        61        71        81        91       101       111       121   
           ELBP_ECOLX    22 APQTITELCSEYRNTQIYTINDKILSYTESMAGKREMVIITFKSGETFQVEVPGSQHIDSQKKAIERMKDTLRITYLTETKIDKLCVWNNKTPNSIAAISMKN 124
               SCOP domains d2xrqh_ H: Heat-labile toxin                                                                            SCOP domains
               CATH domains ------------------------------------------------------------------------------------------------------- CATH domains
           Pfam domains (1) Enterotoxin_b-2xrqH01 H:1-102                                                                         - Pfam domains (1)
           Pfam domains (2) Enterotoxin_b-2xrqH02 H:1-102                                                                         - Pfam domains (2)
           Pfam domains (3) Enterotoxin_b-2xrqH03 H:1-102                                                                         - Pfam domains (3)
           Pfam domains (4) Enterotoxin_b-2xrqH04 H:1-102                                                                         - Pfam domains (4)
           Pfam domains (5) Enterotoxin_b-2xrqH05 H:1-102                                                                         - Pfam domains (5)
         Sec.struct. author ...hhhhhhh....eeeeeeee...eeeeeee..eeeeeee.....eeee.........hhhhhhhhhhhhhhhhhhhh..eeeeeee......eeeeeeee. Sec.struct. author
                 SAPs(SNPs) --------------------------------------------------------------------------A---------------------------- SAPs(SNPs)
                    PROSITE ------------------------------------------------------------------------------------------------------- PROSITE
                 Transcript ------------------------------------------------------------------------------------------------------- Transcript
                 2xrq H   1 APQTITELCSEYRNTQIYTINDKILSYTESMAGKREMVIITFKSGETFQVEVPGSQHIDSQKKAIERMKDTLRITYLTETKIDKLCVWNNKTPNSIAAISMKN 103
                                    10        20        30        40        50        60        70        80        90       100   

Chain H from PDB  Type:PROTEIN  Length:103
 aligned with Q0PRR7_ECOLX | Q0PRR7 from UniProtKB/TrEMBL  Length:124

    Alignment length:103
                                    31        41        51        61        71        81        91       101       111       121   
         Q0PRR7_ECOLX    22 APQTITELCSEYRNTQIYTINDKILSYTESMAGKREMVIITFKSGETFQVEVPGSQHIDSQKKAIERMKDTLRITYLTETKIDKLCVWNNKTPNSIAAISMKN 124
               SCOP domains d2xrqh_ H: Heat-labile toxin                                                                            SCOP domains
               CATH domains ------------------------------------------------------------------------------------------------------- CATH domains
           Pfam domains (1) Enterotoxin_b-2xrqH01 H:1-102                                                                         - Pfam domains (1)
           Pfam domains (2) Enterotoxin_b-2xrqH02 H:1-102                                                                         - Pfam domains (2)
           Pfam domains (3) Enterotoxin_b-2xrqH03 H:1-102                                                                         - Pfam domains (3)
           Pfam domains (4) Enterotoxin_b-2xrqH04 H:1-102                                                                         - Pfam domains (4)
           Pfam domains (5) Enterotoxin_b-2xrqH05 H:1-102                                                                         - Pfam domains (5)
         Sec.struct. author ...hhhhhhh....eeeeeeee...eeeeeee..eeeeeee.....eeee.........hhhhhhhhhhhhhhhhhhhh..eeeeeee......eeeeeeee. Sec.struct. author
                 SAPs(SNPs) --------------------------------------------------------------------------A---------------------------- SAPs(SNPs)
                    PROSITE ------------------------------------------------------------------------------------------------------- PROSITE
                 Transcript ------------------------------------------------------------------------------------------------------- Transcript
                 2xrq H   1 APQTITELCSEYRNTQIYTINDKILSYTESMAGKREMVIITFKSGETFQVEVPGSQHIDSQKKAIERMKDTLRITYLTETKIDKLCVWNNKTPNSIAAISMKN 103
                                    10        20        30        40        50        60        70        80        90       100   

   Legend:   → Mismatch (orange background)
  - → Gap (green background, '-', border residues have a numbering label)
    → Modified Residue (blue background, lower-case, 'x' indicates undefined single-letter code, labelled with number + name)
  x → Chemical Group (purple background, 'x', labelled with number + name, e.g. ACE or NH2)
  extra numbering lines below/above indicate numbering irregularities and modified residue names etc., number ends below/above '|'

 Classification and Annotation

(-) SCOP Domains  (1, 5)

Asymmetric/Biological Unit

(-) CATH Domains  (0, 0)

(no "CATH Domain" information available for 2XRQ)

(-) Pfam Domains  (1, 5)

Asymmetric/Biological Unit

(-) Gene Ontology  (3, 5)

Asymmetric/Biological Unit(hide GO term definitions)
Chain D,E,F,G,H   (ELBP_ECOLX | P32890)
biological process
    GO:0031640    killing of cells of other organism    Any process in an organism that results in the killing of cells of another organism, including in some cases the death of the other organism. Killing here refers to the induction of death in one cell by another cell, not cell-autonomous death due to internal or other environmental conditions.
    GO:0009405    pathogenesis    The set of specific processes that generate the ability of an organism to induce an abnormal, generally detrimental state in another organism.
cellular component
    GO:0005576    extracellular region    The space external to the outermost structure of a cell. For cells without external protective or external encapsulating structures this refers to space outside of the plasma membrane. This term covers the host cell environment outside an intracellular parasite.

Chain D,E,F,G,H   (Q0PRR7_ECOLX | Q0PRR7)
biological process
    GO:0009405    pathogenesis    The set of specific processes that generate the ability of an organism to induce an abnormal, generally detrimental state in another organism.
cellular component
    GO:0005576    extracellular region    The space external to the outermost structure of a cell. For cells without external protective or external encapsulating structures this refers to space outside of the plasma membrane. This term covers the host cell environment outside an intracellular parasite.

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 Related Entries

(-) Entries Sharing at Least One Protein Chain (UniProt ID)

UniProtKB/Swiss-Prot
        ELBP_ECOLX | P328901djr 1eef 1efi 1fd7 1htl 1jqy 1lt3 1lt4 1lt5 1lt6 1lta 1ltb 1ltg 1lti 1lts 1ltt 1pzi 1tet 2xrs 5lzi

(-) Related Entries Specified in the PDB File

2xrs CRYSTAL STRUCTURES EXPLORING THE ORIGINS OF THE BROADER SPECIFICITY OF ESCHERICHIA COLI HEAT-LABILE ENTEROTOXIN COMPARED TO CHOLERA TOXIN