Structural highlights
3pkq is a 4 chain structure with sequence from Salmonella enterica subsp. enterica serovar typhimurium. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
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| Ligands: | , , |
| Related: | 3pkp, 1mp3, 1mp4, 1mp5, 1iim, 1iin |
| Gene: | rfbA, rmlA, STM2095 (Salmonella enterica subsp. enterica serovar Typhimurium) |
| Activity: | Glucose-1-phosphate thymidylyltransferase, with EC number 2.7.7.24 |
| Resources: | FirstGlance, OCA, RCSB, PDBsum |
Function
[RMLA_SALTY] Catalyzes the formation of dTDP-glucose, from dTTP and glucose 1-phosphate, as well as its pyrophosphorolysis. Is also able to convert non natural substrates such as a wide array of alpha-D-hexopyranosyl, deoxy-alpha-D-glucopyranosyl, aminodeoxy-alpha-D-hexopyranosyl and acetamidodeoxy-alpha-D-hexopyranosyl phosphates to their corresponding dTDP- and UDP-nucleotide sugars.[1]
Publication Abstract from PubMed
Directed evolution is a valuable technique to improve enzyme activity in the absence of a priori structural knowledge, which can be typically enhanced via structure-guided strategies. In this study, a combination of both whole-gene error-prone polymerase chain reaction and site-saturation mutagenesis enabled the rapid identification of mutations that improved RmlA activity toward non-native substrates. These mutations have been shown to improve activities over 10-fold for several targeted substrates, including non-native pyrimidine- and purine-based NTPs as well as non-native d- and l-sugars (both alpha- and beta-isomers). This study highlights the first broadly applicable high throughput sugar-1-phosphate nucleotidyltransferase screen and the first proof of concept for the directed evolution of this enzyme class toward the identification of uniquely permissive RmlA variants.
Expanding the Nucleotide and Sugar 1-Phosphate Promiscuity of Nucleotidyltransferase RmlA via Directed Evolution.,Moretti R, Chang A, Peltier-Pain P, Bingman CA, Phillips GN Jr, Thorson JS J Biol Chem. 2011 Apr 15;286(15):13235-43. Epub 2011 Feb 11. PMID:21317292[2]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
See Also
References
- ↑ Lindquist L, Kaiser R, Reeves PR, Lindberg AA. Purification, characterization and HPLC assay of Salmonella glucose-1-phosphate thymidylyl-transferase from the cloned rfbA gene. Eur J Biochem. 1993 Feb 1;211(3):763-70. PMID:8382158
- ↑ Moretti R, Chang A, Peltier-Pain P, Bingman CA, Phillips GN Jr, Thorson JS. Expanding the Nucleotide and Sugar 1-Phosphate Promiscuity of Nucleotidyltransferase RmlA via Directed Evolution. J Biol Chem. 2011 Apr 15;286(15):13235-43. Epub 2011 Feb 11. PMID:21317292 doi:10.1074/jbc.M110.206433
