Glucose-1-phosphate thymidylyltransferase


Function

Glucose-1-phosphate thymidylyltransferase (RmlA) catalyzes the conversion of dTTP and α-D-glucose 1-phosphate (DGP) to diphosphate and dTDP-glucose or dTDP- rhamnose. RmlA participates in nucleotide sugars metabolism, streptomycin biosynthesis and polyketide sugar metabolism[1].

Relevance

dTDP- rhamnose is a component of bacterial cell wall, hence RmlA inhibition is a potential therapeutic target as drugs against pathogenic bacteria.

Structural highlights

RmlA 3D structure can be divided into three functional domains: a core domain which binds . The is formed by the core and sugar-binding domains and the residues comprising it can be divided to catalytic residues (in cyan) and thymidine-specific residues (in green). [2].

3D structures of glucose-1-phosphate thymidylyltransferase

Glucose-1-phosphate thymidylyltransferase 3D structures


Structure of glucose-1-phosphate thymidylyltransferase complex with TTP (PDB code 1g2v).

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ReferencesReferences

  1. PAZUR JH, SHUEY EW. The enzymatic synthesis of thymidine diphosphate glucose and its conversion to thymidine diphosphate rhamnose. J Biol Chem. 1961 Jun;236:1780-5. PMID:13733719
  2. Blankenfeldt W, Asuncion M, Lam JS, Naismith JH. The structural basis of the catalytic mechanism and regulation of glucose-1-phosphate thymidylyltransferase (RmlA). EMBO J. 2000 Dec 15;19(24):6652-63. PMID:11118200 doi:http://dx.doi.org/10.1093/emboj/19.24.6652

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Michal Harel, Alexander Berchansky, Joel L. Sussman