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(-) Description

Title :  PSEUDOMONAS AERUGINOSA RMLA IN COMPLEX WITH ALLOSTERIC INHIBITOR
 
Authors :  M. S. Alphey, L. Pirrie, L. S. Torrie, M. Gardiner, A. Sarkar, R. Brenk, N. J. Westwood, D. Gray, J. H. Naismith
Date :  18 Jul 12  (Deposition) - 31 Oct 12  (Release) - 19 Apr 17  (Revision)
Method :  X-RAY DIFFRACTION
Resolution :  1.70
Chains :  Asym. Unit :  A,B,C,D
Biol. Unit 1:  A,C  (2x)
Biol. Unit 2:  B,D  (2x)
Keywords :  Transferase (Keyword Search: [Gene Ontology, PubMed, Web (Google))
 
Reference :  M. S. Alphey, L. Pirrie, L. S. Torrie, W. A. Boulkeroura, M. Gardiner, A. Sarkar, M. Maringer, W. Oehlmann, R. Brenk, M. S. Scherman, M. Mcneil, M. Rejzek, R. A. Field, M. Singh, D. Gray, N. J. Westwood, J. H. Naismith
Allosteric Competitive Inhibitors Of The Glucose-1-Phosphat Thymidylyltransferase (Rmla) From Pseudomonas Aeruginosa.
Acs Chem. Biol. V. 8 387 2013
PubMed-ID: 23138692  |  Reference-DOI: 10.1021/CB300426U

(-) Compounds

Molecule 1 - GLUCOSE-1-PHOSPHATE THYMIDYLYLTRANSFERASE
    ChainsA, B, C, D
    EC Number2.7.7.24
    EngineeredYES
    Expression SystemESCHERICHIA COLI
    Expression System PlasmidPET23A MODIFIED
    Expression System StrainBL21
    Expression System Taxid511693
    Expression System Vector TypePLASMID
    Organism ScientificPSEUDOMONAS AERUGINOSA
    Organism Taxid208964
    StrainPAO1

 Structural Features

(-) Chains, Units

  1234
Asymmetric Unit ABCD
Biological Unit 1 (2x)A C 
Biological Unit 2 (2x) B D

Summary Information (see also Sequences/Alignments below)

(-) Ligands, Modified Residues, Ions  (3, 9)

Asymmetric Unit (3, 9)
No.NameCountTypeFull Name
1CL4Ligand/IonCHLORIDE ION
2MES1Ligand/Ion2-(N-MORPHOLINO)-ETHANESULFONIC ACID
3NIQ4Ligand/Ion6-AMINO-1-BUTYL-5-(CYCLOPENTYLAMINO)PYRIMIDINE-2,4(1H,3H)-DIONE
Biological Unit 1 (1, 4)
No.NameCountTypeFull Name
1CL-1Ligand/IonCHLORIDE ION
2MES-1Ligand/Ion2-(N-MORPHOLINO)-ETHANESULFONIC ACID
3NIQ4Ligand/Ion6-AMINO-1-BUTYL-5-(CYCLOPENTYLAMINO)PYRIMIDINE-2,4(1H,3H)-DIONE
Biological Unit 2 (2, 6)
No.NameCountTypeFull Name
1CL-1Ligand/IonCHLORIDE ION
2MES2Ligand/Ion2-(N-MORPHOLINO)-ETHANESULFONIC ACID
3NIQ4Ligand/Ion6-AMINO-1-BUTYL-5-(CYCLOPENTYLAMINO)PYRIMIDINE-2,4(1H,3H)-DIONE

(-) Sites  (9, 9)

Asymmetric Unit (9, 9)
No.NameEvidenceResiduesDescription
1AC1SOFTWARELEU A:45 , TYR A:113 , TYR A:114 , GLY A:115 , ARG A:219 , VAL A:250 , ALA A:251 , GLU A:255 , ARG A:259 , GLN A:260 , HOH A:2232 , HOH A:2265BINDING SITE FOR RESIDUE NIQ A 400
2AC2SOFTWAREHIS A:116 , GLY A:218 , ARG A:219 , GLY A:220BINDING SITE FOR RESIDUE CL A 1294
3AC3SOFTWARETYR B:113 , TYR B:114 , GLY B:115 , PHE B:118 , ARG B:219 , VAL B:250 , ALA B:251 , GLU B:255 , GLN B:260 , HOH B:2163 , HOH B:2199BINDING SITE FOR RESIDUE NIQ B 400
4AC4SOFTWAREHIS B:116 , GLY B:220BINDING SITE FOR RESIDUE CL B 1294
5AC5SOFTWARELEU C:45 , TYR C:113 , TYR C:114 , GLY C:115 , ARG C:219 , GLY C:220 , LYS C:249 , VAL C:250 , ALA C:251 , GLU C:255 , ARG C:259 , HOH C:2164BINDING SITE FOR RESIDUE NIQ C 400
6AC6SOFTWAREHIS C:116 , GLY C:218 , ARG C:219 , GLY C:220 , HOH C:2200BINDING SITE FOR RESIDUE CL C 1294
7AC7SOFTWARELEU D:45 , TYR D:113 , TYR D:114 , GLY D:115 , PHE D:118 , ARG D:219 , VAL D:250 , ALA D:251 , GLU D:255 , HOH D:2146BINDING SITE FOR RESIDUE NIQ D 400
8AC8SOFTWAREHIS D:116 , ARG D:219 , GLY D:220BINDING SITE FOR RESIDUE CL D 1294
9AC9SOFTWAREPHE D:150 , GLY D:154 , LYS D:155 , ALA D:156 , LEU D:212 , VAL D:214 , TYR D:293 , HOH D:2125BINDING SITE FOR RESIDUE MES D 1295

(-) SS Bonds  (0, 0)

(no "SS Bond" information available for 4B2X)

(-) Cis Peptide Bonds  (4, 4)

Asymmetric Unit
No.Residues
1His A:17 -Pro A:18
2His B:17 -Pro B:18
3His C:17 -Pro C:18
4His D:17 -Pro D:18

 Sequence-Structure Mapping

(-) SAPs(SNPs)/Variants  (0, 0)

(no "SAP(SNP)/Variant" information available for 4B2X)

(-) PROSITE Motifs  (0, 0)

(no "PROSITE Motif" information available for 4B2X)

(-) Exons   (0, 0)

(no "Exon" information available for 4B2X)

(-) Sequences/Alignments

Asymmetric 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 A from PDB  Type:PROTEIN  Length:299
 aligned with Q9HU22_PSEAE | Q9HU22 from UniProtKB/TrEMBL  Length:293

    Alignment length:299
                                  1                                                                                                                                                                                                                                                                                                    
                                  |  4        14        24        34        44        54        64        74        84        94       104       114       124       134       144       154       164       174       184       194       204       214       224       234       244       254       264       274       284         
         Q9HU22_PSEAE     - ------MKRKGIILAGGSGTRLHPATLAISKQLLPVYDKPMIYYPLSTLMLAGIREILIISTPQDTPRFQQLLGDGSNWGLDLQYAVQPSPDGLAQAFLIGESFIGNDLSALVLGDNLYYGHDFHELLGSASQRQTGASVFAYHVLDPERYGVVEFDQGGKAISLEEKPLEPKSNYAVTGLYFYDQQVVDIARDLKPSPRGELEITDVNRAYLERGQLSVEIMGRGYAWLDTGTHDSLLEAGQFIATLENRQGLKVACPEEIAYRQKWIDAAQLEKLAAPLAKNGYGQYLKRLLTETVY 293
               SCOP domains d4b2xa_ A: automated matches                                                                                                                                                                                                                                                                                SCOP domains
               CATH domains ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- CATH domains
               Pfam domains ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Pfam domains
         Sec.struct. author .........eeeeee..............hhhh.ee..ee.hhhhhhhhhhh...eeeeee...hhhhhhhhhh.hhhhh.eeeeee.......hhhhhhhhhhhh...eeeee...eee..hhhhhhhhhhhh...eeeeeee..hhhh.eeeee.....eeeeee........eee..eeee..hhhhhhhh.........hhhhhhhhhhhh..eeeee.....eee...hhhhhhhhhhhhhhhhhhhh....hhhhhhhhh...hhhhhhhhhhhhh.hhhhhhhhhhh..... Sec.struct. author
                 SAPs(SNPs) ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- SAPs(SNPs)
                    PROSITE ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- PROSITE
                 Transcript ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Transcript
                 4b2x A -10 HHHHHHMKRKGIILAGGSGTRLHPATLAISKQLLPVYDKPMIYYPLSTLMLAGIREILIISTPQDTPRFQQLLGDGSNWGLDLQYAVQPSPDGLAQAFLIGESFIGNDLSALVLGDNLYYGHDFHELLGSASQRQTGASVFAYHVLDPERYGVVEFDQGGKAISLEEKPLEPKSNYAVTGLYFYDQQVVDIARDLKPSPRGELEITDVNRAYLERGQLSVEIMGRGYAWLDTGTHDSLLEAGQFIATLENRQGLKVACPEEIAYRQKWIDAAQLEKLAAPLAKNGYGQYLKRLLTETVY 293
                                 ||  4        14        24        34        44        54        64        74        84        94       104       114       124       134       144       154       164       174       184       194       204       214       224       234       244       254       264       274       284         
                                -5|                                                                                                                                                                                                                                                                                                    
                                  1                                                                                                                                                                                                                                                                                                    

Chain B from PDB  Type:PROTEIN  Length:302
 aligned with Q9HU22_PSEAE | Q9HU22 from UniProtKB/TrEMBL  Length:293

    Alignment length:302
                                     1                                                                                                                                                                                                                                                                                                    
                                     1        11        21        31        41        51        61        71        81        91       101       111       121       131       141       151       161       171       181       191       201       211       221       231       241       251       261       271       281       291  
         Q9HU22_PSEAE     - ---------MKRKGIILAGGSGTRLHPATLAISKQLLPVYDKPMIYYPLSTLMLAGIREILIISTPQDTPRFQQLLGDGSNWGLDLQYAVQPSPDGLAQAFLIGESFIGNDLSALVLGDNLYYGHDFHELLGSASQRQTGASVFAYHVLDPERYGVVEFDQGGKAISLEEKPLEPKSNYAVTGLYFYDQQVVDIARDLKPSPRGELEITDVNRAYLERGQLSVEIMGRGYAWLDTGTHDSLLEAGQFIATLENRQGLKVACPEEIAYRQKWIDAAQLEKLAAPLAKNGYGQYLKRLLTETVY 293
               SCOP domains d4b2xb_ B: automated matches                                                                                                                                                                                                                                                                                   SCOP domains
               CATH domains -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- CATH domains
               Pfam domains -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Pfam domains
         Sec.struct. author ...........eeeeee.........hhhhhhhhhh.ee..ee.hhhhhhhhhhh...eeeeee...hhhhhhhhhh.hhhhh.eeeeee.......hhhhhhhhhhhh..eeeeee..eeee..hhhhhhhhhhhh...eeeeeee..hhhh.eeeee.....eeeeee........eee..eeee..hhhhhhhh.........hhhhhhhhhhhh..eeeee.....eeee..hhhhhhhhhhhhhhhhhhhh....hhhhhhhhh...hhhhhhhhhhhhh.hhhhhhhhhhh..... Sec.struct. author
                 SAPs(SNPs) -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- SAPs(SNPs)
                    PROSITE -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- PROSITE
                 Transcript -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Transcript
                 4b2x B  -8 HHHHHGSMAMKRKGIILAGGSGTRLHPATLAISKQLLPVYDKPMIYYPLSTLMLAGIREILIISTPQDTPRFQQLLGDGSNWGLDLQYAVQPSPDGLAQAFLIGESFIGNDLSALVLGDNLYYGHDFHELLGSASQRQTGASVFAYHVLDPERYGVVEFDQGGKAISLEEKPLEPKSNYAVTGLYFYDQQVVDIARDLKPSPRGELEITDVNRAYLERGQLSVEIMGRGYAWLDTGTHDSLLEAGQFIATLENRQGLKVACPEEIAYRQKWIDAAQLEKLAAPLAKNGYGQYLKRLLTETVY 293
                                     1        11        21        31        41        51        61        71        81        91       101       111       121       131       141       151       161       171       181       191       201       211       221       231       241       251       261       271       281       291  

Chain C from PDB  Type:PROTEIN  Length:293
 aligned with Q9HU22_PSEAE | Q9HU22 from UniProtKB/TrEMBL  Length:293

    Alignment length:293
                                    10        20        30        40        50        60        70        80        90       100       110       120       130       140       150       160       170       180       190       200       210       220       230       240       250       260       270       280       290   
         Q9HU22_PSEAE     1 MKRKGIILAGGSGTRLHPATLAISKQLLPVYDKPMIYYPLSTLMLAGIREILIISTPQDTPRFQQLLGDGSNWGLDLQYAVQPSPDGLAQAFLIGESFIGNDLSALVLGDNLYYGHDFHELLGSASQRQTGASVFAYHVLDPERYGVVEFDQGGKAISLEEKPLEPKSNYAVTGLYFYDQQVVDIARDLKPSPRGELEITDVNRAYLERGQLSVEIMGRGYAWLDTGTHDSLLEAGQFIATLENRQGLKVACPEEIAYRQKWIDAAQLEKLAAPLAKNGYGQYLKRLLTETVY 293
               SCOP domains d4b2xc_ C: automated matches                                                                                                                                                                                                                                                                          SCOP domains
               CATH domains ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- CATH domains
               Pfam domains ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Pfam domains
         Sec.struct. author ..eeeeeee..............hhhh.ee..ee.hhhhhhhhhhh...eeeeee...hhhhhhhhhh.hhhhh.eeeeee.......hhhhhhhhhhhh..eeeeee...eee..hhhhhhhhhhhh...eeeeeee..hhhh.eeeee.....eeeeee........eeeeeeeee..hhhhhhhh.........hhhhhhhhhhhh..eeeee.....eee...hhhhhhhhhhhhhhhhhhhh....hhhhhhhhh...hhhhhhhhhh....hhhhhhhhhh...... Sec.struct. author
                 SAPs(SNPs) ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- SAPs(SNPs)
                    PROSITE ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- PROSITE
                 Transcript ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Transcript
                 4b2x C   1 MKRKGIILAGGSGTRLHPATLAISKQLLPVYDKPMIYYPLSTLMLAGIREILIISTPQDTPRFQQLLGDGSNWGLDLQYAVQPSPDGLAQAFLIGESFIGNDLSALVLGDNLYYGHDFHELLGSASQRQTGASVFAYHVLDPERYGVVEFDQGGKAISLEEKPLEPKSNYAVTGLYFYDQQVVDIARDLKPSPRGELEITDVNRAYLERGQLSVEIMGRGYAWLDTGTHDSLLEAGQFIATLENRQGLKVACPEEIAYRQKWIDAAQLEKLAAPLAKNGYGQYLKRLLTETVY 293
                                    10        20        30        40        50        60        70        80        90       100       110       120       130       140       150       160       170       180       190       200       210       220       230       240       250       260       270       280       290   

Chain D from PDB  Type:PROTEIN  Length:293
 aligned with Q9HU22_PSEAE | Q9HU22 from UniProtKB/TrEMBL  Length:293

    Alignment length:293
                                    10        20        30        40        50        60        70        80        90       100       110       120       130       140       150       160       170       180       190       200       210       220       230       240       250       260       270       280       290   
         Q9HU22_PSEAE     1 MKRKGIILAGGSGTRLHPATLAISKQLLPVYDKPMIYYPLSTLMLAGIREILIISTPQDTPRFQQLLGDGSNWGLDLQYAVQPSPDGLAQAFLIGESFIGNDLSALVLGDNLYYGHDFHELLGSASQRQTGASVFAYHVLDPERYGVVEFDQGGKAISLEEKPLEPKSNYAVTGLYFYDQQVVDIARDLKPSPRGELEITDVNRAYLERGQLSVEIMGRGYAWLDTGTHDSLLEAGQFIATLENRQGLKVACPEEIAYRQKWIDAAQLEKLAAPLAKNGYGQYLKRLLTETVY 293
               SCOP domains d4b2xd_ D: automated matches                                                                                                                                                                                                                                                                          SCOP domains
               CATH domains ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- CATH domains
               Pfam domains ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Pfam domains
         Sec.struct. author ..eeeeeee........hhhhh.hhhh.ee..ee.hhhhhhhhhhh...eeeeee...hhhhhhhhhh.hhhhh.eeeeee.......hhhhhhhhhhhh..eeeeee..eeee..hhhhhhhhhhhh...eeeeeee..hhhh.eeeee.....eeeeee........eeeeeeeee..hhhhhhhh.........hhhhhhhhhhhh..eeeee.....eeee..hhhhhhhhhhhhhhhhhhhh....hhhhhhhhh...hhhhhhhhhhhhh.hhhhhhhhhhhhh... Sec.struct. author
                 SAPs(SNPs) ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- SAPs(SNPs)
                    PROSITE ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- PROSITE
                 Transcript ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Transcript
                 4b2x D   1 MKRKGIILAGGSGTRLHPATLAISKQLLPVYDKPMIYYPLSTLMLAGIREILIISTPQDTPRFQQLLGDGSNWGLDLQYAVQPSPDGLAQAFLIGESFIGNDLSALVLGDNLYYGHDFHELLGSASQRQTGASVFAYHVLDPERYGVVEFDQGGKAISLEEKPLEPKSNYAVTGLYFYDQQVVDIARDLKPSPRGELEITDVNRAYLERGQLSVEIMGRGYAWLDTGTHDSLLEAGQFIATLENRQGLKVACPEEIAYRQKWIDAAQLEKLAAPLAKNGYGQYLKRLLTETVY 293
                                    10        20        30        40        50        60        70        80        90       100       110       120       130       140       150       160       170       180       190       200       210       220       230       240       250       260       270       280       290   

   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, 4)

Asymmetric Unit

(-) CATH Domains  (0, 0)

(no "CATH Domain" information available for 4B2X)

(-) Pfam Domains  (0, 0)

(no "Pfam Domain" information available for 4B2X)

(-) Gene Ontology  (7, 7)

Asymmetric Unit(hide GO term definitions)
Chain A,B,C,D   (Q9HU22_PSEAE | Q9HU22)
molecular function
    GO:0008879    glucose-1-phosphate thymidylyltransferase activity    Catalysis of the reaction: alpha-D-glucose 1-phosphate + dTTP = diphosphate + dTDP-glucose.
    GO:0046872    metal ion binding    Interacting selectively and non-covalently with any metal ion.
    GO:0000166    nucleotide binding    Interacting selectively and non-covalently with a nucleotide, any compound consisting of a nucleoside that is esterified with (ortho)phosphate or an oligophosphate at any hydroxyl group on the ribose or deoxyribose.
    GO:0016779    nucleotidyltransferase activity    Catalysis of the transfer of a nucleotidyl group to a reactant.
    GO:0016740    transferase activity    Catalysis of the transfer of a group, e.g. a methyl group, glycosyl group, acyl group, phosphorus-containing, or other groups, from one compound (generally regarded as the donor) to another compound (generally regarded as the acceptor). Transferase is the systematic name for any enzyme of EC class 2.
biological process
    GO:0009058    biosynthetic process    The chemical reactions and pathways resulting in the formation of substances; typically the energy-requiring part of metabolism in which simpler substances are transformed into more complex ones.
    GO:0045226    extracellular polysaccharide biosynthetic process    The chemical reactions and pathways resulting in the formation of polysaccharides used in extracellular structures.

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 Related Entries

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

UniProtKB/TrEMBL
        Q9HU22_PSEAE | Q9HU221fxo 1fzw 1g0r 1g1l 1g23 1g2v 1g3l 3zlk 3zll 4arw 4asj 4asy 4b2w 4b3u 4b42 4b4b 4b4g 4b4m 4b5b 5fts 5ftv 5fu0 5fu8 5fuh 5fye

(-) Related Entries Specified in the PDB File

1fxo THE STRUCTURAL BASIS OF THE CATALYTIC MECHANISM ANDREGULATION OF GLUCOSE-1-PHOSPHATE THYMIDYLYLTRANSFERASE (RMLA). TMP COMPLEX.
1fzw THE STRUCTURAL BASIS OF THE CATALYTIC MECHANISM ANDREGULATION OF GLUCOSE-1-PHOSPHATE THYMIDYLYLTRANSFERASE (RMLA). APO ENZYME.
1g0r THE STRUCTURAL BASIS OF THE CATALYTIC MECHANISM ANDREGULATION OF GLUCOSE-1-PHOSPHATE THYMIDYLYLTRANSFERASE (RMLA). THYMIDINE/GLUCOSE- 1-PHOSPHATE COMPLEX.
1g1l THE STRUCTURAL BASIS OF THE CATALYTIC MECHANISM ANDREGULATION OF GLUCOSE-1-PHOSPHATE THYMIDYLYLTRANSFERASE (RMLA). TDP-GLUCOSE COMPLEX.
1g23 THE STRUCTURAL BASIS OF THE CATALYTIC MECHANISM ANDREGULATION OF GLUCOSE-1-PHOSPHATE THYMIDYLYLTRANSFERASE (RMLA). GLUCOSE-1- PHOSPHATE COMPLEX.
1g2v THE STRUCTURAL BASIS OF THE CATALYTIC MECHANISM ANDREGULATION OF GLUCOSE-1-PHOSPHATE THYMIDYLYLTRANSFERASE (RMLA). TTP COMPLEX.
1g3l THE STRUCTURAL BASIS OF THE CATALYTIC MECHANISM ANDREGULATION OF GLUCOSE-1-PHOSPHATE THYMIDYLYLTRANSFERASE (RMLA). TDP-L-RHAMNOSE COMPLEX.