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Dimerization of inositol monophosphatase Mycobacterium tuberculosis SuhB is not constitutive, but induced by binding of the activator Mg2+.
(2007) BMC Struct Biol 7
PubMed: 17725819 | PubMedCentral: PMC2080633 | DOI: 10.1186/1472-6807-7-55
Table 3 BLAST search for M. tuberculosis IMPase homologues of known structure SuhB Rv3137 ImpA CysQ 1IMA a 2BJI 1JP4 2P3N 1G0H SuhB 100 30 23 22 25 25 14 23 19 Rv3137 100 23 18 23 22 22 29 17 ImpA 100... 13 15 16 12 22 20 CysQ 100 14 12 16 7 3 1IMA (IMP human) 2.0E-20 100 88 16 28 19 (194) 2BJI (IMP bovine) 3.0E-21 4.7E-07 100 19 28 20 (194) (165) 1JP4 (PIPase_Rno) 2.7E-05 100 18 15 (169) 2P3N (TM1415_Tma) 9.5E-16 4.0E-12 8.7E-04 100 23 (221) (247) (192) 1G0H (MJ0109_Mja) 6.3E-10 100 (161) Fields above the table diagonal give the %-identity in a STRAP -generated multiple sequence alignment.
Structure factor amplitudes were normalized ( ECALC – [ 43 ]), and initial phases were obtained by molecular replacement ( AMORE – [ 43 ]), using monomer coordinates of human IMPase (PDB: 1IMA – [ 29 ]) as a search model.
Table 2 Comparison of M. tuberculosis SuhB to selected members of the Mg 2+ -dependent/Li + -inhibited phosphomonoesterase family of proteins IMPase c FBPase IMPase/FBPase PAPase IPPase PiPase PDB ID a 1IMA 2CZH 2BJI 1FBP 1DCU 1LBV 1DK4 1QGX 1INP 1JP4 RMSD (Å) 1.09 (197) b 1.12 (199) 1.15 (193) 1.61 (159) 1.88 (138) 1.23 (177) 1.13 (158) 1.28 (190) 1.41 (166) 1.40 (182) a References for the pdb entries cited in this table are provided in the supplementary information [see Additional file 3 ].
( A ) Active site of subunit A of SuhB, with metal sites (beige) and inositol-1-phosphate (coloured by atom type, carbons in light grey) modelled based on superimposition with the structures of bovine (PDB: 2BJI , ) and human IMPase (PDB: 1IMA , ).
The loop in violet indicates the approximate position of the α1-α2 loop, based on the superposition with PDB: 1IMA .
Sequence abbreviations (with pdb accession code in parentheses) are as follows: SuhB_Mtb – Mycobacterium tuberculosis SuhB ; Rv3137_Mtb – gene product Rv3131 of M. tuberculosis; ImpA_Mtb – M. tuberculosis ImpA; CysQ_Mtb – M. tuberculosis CysQ; IMPase_hum – human inositol monophosphatase ( 1IMA ); IMPase2_hum – human inositol monophosphatase 2 ( 2CZH ); IMPase_bov – bovine inositol monophosphatase ( 2BJI ); SuhB_Eco – Escherichia coli SuhB; MJ0109_Mja – Methanococcus jannaschii IMPase/FBPase MJ0109 ( 1DK4 ); AF2372_Afu – Archeoglobus fulgidus IMPase/FBPase AF2372 ( 1LBV ); TM1415_Tma – Thermotoga maritima IMPase TM1415 ( 2P3N ); PIPase_Rno – Rattus norvegicus 3'-phosphoadenosine 5'-phosphate and inositol 1,4-bisphosphate phosphatase ( 1JP4 ).
The density is superimposed with apo SuhB (blue sticks) and human IMPase in complex with inositol-1-phosphate (light green, PDB: 1IMA , ).
a References for PDB entries: 1IMA – human IMPase complexed with myo- inositol-1-phosphate  2BJI – bovine IMPase  1JP4 – Rattus norvegicus 3'-phosphoadenosine 5'-phosphate and inositol-1,4-bisphosphate phosphatase  2P3N – Thermotoga maritima TM1415 IMPase/FBPase  1G0H – Methanococcus jannaschii MJ0109 IMPase/FBPase .
Publication Year: 2007
Inositol monophosphate phosphatase genes of Mycobacterium tuberculosis.
(2010) BMC Microbiol 10
PubMed: 20167072 | PubMedCentral: PMC2834668 | DOI: 10.1186/1471-2180-10-50
All four M. tuberculosis proteins are equally distant from the human IMPase (PDB structure 1IMA ; 22-30% identity, 37-46% similarity) [ 34 ] and the aligned amino acid sequences are shown in Figure 1A... .
Publication Year: 2010
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