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(-) Description

Title :  MEDIUM RESOLUTION CRYSTAL STRUCTURE OF PTERIN-4A-CARBINOLAMINE DEHYDRATASE FROM TOXOPLASMA GONDII
 
Authors :  S. Cameron, S. A. Fyffe, W. N. Hunter
Date :  20 Jul 07  (Deposition) - 22 Jul 08  (Release) - 24 Feb 09  (Revision)
Method :  X-RAY DIFFRACTION
Resolution :  2.22
Chains :  Asym. Unit :  A,B
Biol. Unit 1:  A,B  (2x)
Keywords :  Lyase, Pterin, Enzyme, Toxoplasma, Dehydratase (Keyword Search: [Gene Ontology, PubMed, Web (Google)] )
 
Reference :  S. Cameron, S. A. Fyffe, S. Goldie, W. N. Hunter
Crystal Structures Of Toxoplasma Gondii Pterin-4A- Carbinolamine Dehydratase And Comparisons With Mammalian And Parasite Orthologues.
Mol. Biochem. Parasitol. V. 158 131 2008
PubMed-ID: 18215430  |  Reference-DOI: 10.1016/J.MOLBIOPARA.2007.12.002

(-) Compounds

Molecule 1 - PTERIN-4A-CARBINOLAMINE DEHYDRATASE
    Chains: A, B
    EC Number: 4.2.1.96
    Engineered: YES
    Expression System: ESCHERICHIA COLI
    Expression System Plasmid: MODIFIED PET15B (NOVAGEN)
    Expression System Strain: BL21 (DE3)
    Expression System Taxid: 469008
    Organism Scientific: TOXOPLASMA GONDII
    Organism Taxid: 383379
    Strain: RH

 Structural Features

(-) Chains, Units

  12
Asymmetric Unit : AB
Biological Unit 1 (2x): AB

Summary Information (see also Sequences/Alignments below)

(-) Ligands, Modified Residues, Ions  (0, 0)

(no "Ligand,Modified Residues,Ions" information available for 2V6S)

(-) Sites  (0, 0)

(no "Site" information available for 2V6S)

(-) SS Bonds  (0, 0)

(no "SS Bond" information available for 2V6S)

(-) Cis Peptide Bonds  (0, 0)

(no "Cis Peptide Bond" information available for 2V6S)

 Sequence-Structure Mapping

(-) SAPs(SNPs)/Variants  (0, 0)

(no "SAP(SNP)/Variant" information available for 2V6S)

(-) PROSITE Motifs  (0, 0)

(no "PROSITE Motif" information available for 2V6S)

(-) Exons   (0, 0)

(no "Exon" information available for 2V6S)

(-) Sequences/Alignments

Asymmetric Unit
   Reformat: Number of residues per line =  ('0' or empty: single-line sequence representation)
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  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 A from PDB  Type:PROTEIN  Length:102
 aligned with Q2Q449_TOXGO | Q2Q449 from UniProtKB/TrEMBL  Length:104

    Alignment length:102
                                    10        20        30        40        50        60        70        80        90       100  
         Q2Q449_TOXGO     1 MAPLARLAANSARLLQLHKTVPQWHLTDGHLSIKRKFQFSDFNEAWGFMSRVALYADKVDHHPNWYNVYNTVDVELSTHDAAGLTEKDFALAKFMDDAAKNF 102
               SCOP domains ------------------------------------------------------------------------------------------------------ SCOP domains
               CATH domains 2v6sA00 A:1-102  [code=3.30.1360.20, no name defined]                                                  CATH domains
               Pfam domains ------------------------------------------------------------------------------------------------------ Pfam domains
         Sec.struct. author ...........hhhhhhhhh...eeee.....eeeeee...hhhhhhhhhhhhhhhhhh....eeeee..eeeeee.........hhhhhhhhhhhhhhhhh Sec.struct. author
                 SAPs(SNPs) ------------------------------------------------------------------------------------------------------ SAPs(SNPs)
                    PROSITE ------------------------------------------------------------------------------------------------------ PROSITE
                 Transcript ------------------------------------------------------------------------------------------------------ Transcript
                 2v6s A   1 MAPLARLAANSARLLQLHKTVPQWHLTDGHLSIKRKFQFSDFNEAWGFMSRVALYADKVDHHPNWYNVYNTVDVELSTHDAAGLTEKDFALAKFMDDAAKNF 102
                                    10        20        30        40        50        60        70        80        90       100  


Chain B from PDB  Type:PROTEIN  Length:98
 aligned with Q2Q449_TOXGO | Q2Q449 from UniProtKB/TrEMBL  Length:104

    Alignment length:98
                                    14        24        34        44        54        64        74        84        94        
         Q2Q449_TOXGO     5 ARLAANSARLLQLHKTVPQWHLTDGHLSIKRKFQFSDFNEAWGFMSRVALYADKVDHHPNWYNVYNTVDVELSTHDAAGLTEKDFALAKFMDDAAKNF 102
               SCOP domains -------------------------------------------------------------------------------------------------- SCOP domains
               CATH domains 2v6sB00 B:5-102  [code=3.30.1360.20, no name defined]                                              CATH domains
           Pfam domains (1) Pterin_4a-2v6sB01 B:5-100                                                                       -- Pfam domains (1)
           Pfam domains (2) Pterin_4a-2v6sB02 B:5-100                                                                       -- Pfam domains (2)
         Sec.struct. author .......hhhhhhhhh...eeee.....eeeeee...hhhhhhhhhhhhhhhhhh....eeeee..eeeeee.......................... Sec.struct. author
                 SAPs(SNPs) -------------------------------------------------------------------------------------------------- SAPs(SNPs)
                    PROSITE -------------------------------------------------------------------------------------------------- PROSITE
                 Transcript -------------------------------------------------------------------------------------------------- Transcript
                 2v6s B   5 ARLAANSARLLQLHKTVPQWHLTDGHLSIKRKFQFSDFNEAWGFMSRVALYADKVDHHPNWYNVYNTVDVELSTHDAAGLTEKDFALAKFMDDAAKNF 102
                                    14        24        34        44        54        64        74        84        94
   Legend:   → Mismatch (orange background)
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  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  (0, 0)

(no "SCOP Domain" information available for 2V6S)

(-) CATH Domains  (1, 2)

Asymmetric Unit
(-)
Class: Alpha Beta (26913)

(-) Pfam Domains  (1, 2)

Asymmetric Unit
(-)
Clan: no clan defined [family: Pterin_4a] (7)

(-) Gene Ontology  (3, 3)

Asymmetric Unit(hide GO term definitions)
Chain A,B   (Q2Q449_TOXGO | Q2Q449)
molecular function
    GO:0008124    4-alpha-hydroxytetrahydrobiopterin dehydratase activity    Catalysis of the reaction: (6R)-6-(L-erythro-1,2-dihydroxypropyl)-5,6,7,8-tetrahydro-4a-hydroxypterin = (6R)-6-(L-erythro-1,2-dihydroxypropyl)-7,8-dihydro-6H-pterin + H(2)O.
    GO:0016829    lyase activity    Catalysis of the cleavage of C-C, C-O, C-N and other bonds by other means than by hydrolysis or oxidation, or conversely adding a group to a double bond. They differ from other enzymes in that two substrates are involved in one reaction direction, but only one in the other direction. When acting on the single substrate, a molecule is eliminated and this generates either a new double bond or a new ring.
biological process
    GO:0006729    tetrahydrobiopterin biosynthetic process    The chemical reactions and pathways resulting in the formation of tetrahydrobiopterin, the reduced form of biopterin (2-amino-4-hydroxy-6-(1,2-dihydroxypropyl)-pteridine). It functions as a hydroxylation coenzyme, e.g. in the conversion of phenylalanine to tyrosine.

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 Related Entries

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

UniProtKB/TrEMBL
        Q2Q449_TOXGO | Q2Q449: 2v6t 2v6u

(-) Related Entries Specified in the PDB File

2v6t CRYSTAL STRUCTURE OF A COMPLEX OF PETRIN- 4A-CARBINOLAMINE DEHYDRATASE FROM TOXOPLASMA GONDII WITH 7,8-DIHYDROBIOPTERIN