Escherichia coli K-12 substr. MG1655 Polypeptide: NADH-dependent dihydropyrimidine dehydrogenase subunit

Gene: preT Accession Numbers: G7145 (EcoCyc), b2146, ECK2139

Synonyms: yeiT

Regulation Summary Diagram: ?

Regulation summary diagram for preT

Component of: NAD-dependent dihydropyrimidine dehydrogenase (summary available)

Based on sequence similarity, PreT was predicted to be a dihydrothymine dehydrogenase or glutamate synthase [Reed03, Serres01]. PreT has similarity to the N-terminal half of mammalian dihydropyrimidine dehydrogenase [Hidese11].

PreT was shown to be in a complex with PreA [Lasserre06, Mihara08].

Expression of preT is 20-fold higher in a biofilm than during exponential growth in liquid culture [Schembri03].

Locations: cytosol

Map Position: [2,232,055 -> 2,233,293] (48.11 centisomes, 173°)
Length: 1239 bp / 412 aa

Molecular Weight of Polypeptide: 44.329 kD (from nucleotide sequence)

Unification Links: ASAP:ABE-0007096 , DIP:DIP-28055N , EchoBASE:EB3827 , EcoGene:EG14074 , EcoliWiki:b2146 , ModBase:P76440 , OU-Microarray:b2146 , PortEco:yeiT , Protein Model Portal:P76440 , RefSeq:NP_416651 , RegulonDB:G7145 , SMR:P76440 , String:511145.b2146 , UniProt:P76440

Relationship Links: InterPro:IN-FAMILY:IPR001327 , InterPro:IN-FAMILY:IPR009051 , InterPro:IN-FAMILY:IPR016040 , InterPro:IN-FAMILY:IPR023753 , InterPro:IN-FAMILY:IPR028261 , Pfam:IN-FAMILY:PF00070 , Pfam:IN-FAMILY:PF07992 , Pfam:IN-FAMILY:PF14691

In Paralogous Gene Group: 40 (11 members) , 381 (3 members) , 487 (3 members)

Gene-Reaction Schematic: ?

Gene-Reaction Schematic

Genetic Regulation Schematic: ?

Genetic regulation schematic for preT

GO Terms:

Biological Process: GO:0006208 - pyrimidine nucleobase catabolic process Inferred from experiment [Hidese11]
GO:0008152 - metabolic process Inferred by computational analysis [Reed03]
GO:0055114 - oxidation-reduction process Inferred by computational analysis [UniProtGOA11a, GOA01a]
Molecular Function: GO:0003954 - NADH dehydrogenase activity Inferred from experiment [Hidese11]
GO:0005515 - protein binding Inferred from experiment [Lasserre06, Mihara08]
GO:0051536 - iron-sulfur cluster binding Inferred from experiment Inferred by computational analysis [GOA01a, Mihara08]
GO:0004159 - dihydrouracil dehydrogenase (NAD+) activity Inferred by computational analysis [GOA01]
GO:0016491 - oxidoreductase activity Inferred by computational analysis [UniProtGOA11a, GOA01a]
GO:0050660 - flavin adenine dinucleotide binding Inferred by computational analysis [GOA01a]
Cellular Component: GO:0005737 - cytoplasm Inferred by computational analysis [Gaudet10]
GO:0005829 - cytosol Inferred by computational analysis [DiazMejia09, Lasserre06]

MultiFun Terms: metabolism

Essentiality data for preT knockouts: ?

Growth Medium Growth? T (°C) O2 pH Osm/L Growth Observations
LB enriched Yes 37 Aerobic 6.95   Yes [Gerdes03, Comment 1]
LB Lennox Yes 37 Aerobic 7   Yes [Baba06, Comment 2]
M9 medium with 1% glycerol Yes 37 Aerobic 7.2 0.35 Yes [Joyce06, Comment 3]
MOPS medium with 0.4% glucose Yes 37 Aerobic 7.2 0.22 Yes [Baba06, Comment 2]

Curated 05-Jan-2006 by Shearer A , SRI International
Last-Curated ? 20-Mar-2009 by Keseler I , SRI International

Subunit of: NAD-dependent dihydropyrimidine dehydrogenase

Subunit composition of NAD-dependent dihydropyrimidine dehydrogenase = [PreT]2[PreA]2
         NADH-dependent dihydropyrimidine dehydrogenase subunit = PreT (summary available)
         NADH-dependent dihydropyrimidine dehydrogenase subunit = PreA (summary available)

The purified and reconstituted PreA/PreT complex was shown to have NAD-dependent dihydropyrimidine dehydrogenase activity [Mihara08, Hidese11]. The enzyme appears to produce dihydrouracil during exponential growth and during stationary phase convert it back to uracil, which can be incorporated into nucleic acids [Hidese11].

A preTA-deficient mutant has no growth defect in LB medium, but it is not producing dihydrouracil [Hidese11].

GO Terms:

Molecular Function: GO:0004159 - dihydrouracil dehydrogenase (NAD+) activity Inferred from experiment [Hidese11, Mihara08]

Created 19-Mar-2009 by Keseler I , SRI International
Last-Curated ? 05-Jan-2011 by Keseler I , SRI International

Enzymatic reaction of: dihydropyrimidine dehydrogenase

Synonyms: dihydrouracil dehydrogenase (NAD+), 5,6-dihydrouracil:NAD+ 5-oxidoreductase, DPD

EC Number:

5,6-dihydrouracil + NAD+ <=> uracil + NADH + H+

The reaction direction shown, that is, A + B ↔ C + D versus C + D ↔ A + B, is in accordance with the direction of enzyme catalysis.

This reaction is reversible. [Hidese11]

Alternative Substrates for uracil: 5-fluorouracil [Hidese11 ]

NADP+ can not substitute for NAD+ [Mihara08].

Km for uracil was measured at pH 6.0, while the Km for 5.6-dihydrouracil was measured at pH 11.0 [Hidese11].

Kinetic Parameters:

Km (μM)

Enzymatic reaction of: dihydropyrimidine dehydrogenase

Synonyms: dihydrothymine dehydrogenase (NAD+)

EC Number:

5,6-dihydrothymine + NAD+ <=> thymine + NADH + H+

The reaction direction shown, that is, A + B ↔ C + D versus C + D ↔ A + B, is in accordance with the direction of enzyme catalysis.

This reaction is reversible. [Hidese11]

Km for thymine was measured at pH 6.0, while the Km for 5.6-dihydrothymine was measured at pH 11.0 [Hidese11].

Kinetic Parameters:

Km (μM)

Sequence Features

Protein sequence of NADH-dependent dihydropyrimidine dehydrogenase subunit with features indicated

Feature Class Location Citations Comment
Amino-Acid-Sites-That-Bind 286
UniProt: NAD; Non-Experimental Qualifier: probable.

Gene Local Context (not to scale): ?

Gene local context diagram

Transcription Unit:

Transcription-unit diagram


Markus Krummenacker on Tue Oct 14, 1997:
Gene object created from Blattner lab Genbank (v. M52) entry.


Baba06: Baba T, Ara T, Hasegawa M, Takai Y, Okumura Y, Baba M, Datsenko KA, Tomita M, Wanner BL, Mori H (2006). "Construction of Escherichia coli K-12 in-frame, single-gene knockout mutants: the Keio collection." Mol Syst Biol 2;2006.0008. PMID: 16738554

DiazMejia09: Diaz-Mejia JJ, Babu M, Emili A (2009). "Computational and experimental approaches to chart the Escherichia coli cell-envelope-associated proteome and interactome." FEMS Microbiol Rev 33(1);66-97. PMID: 19054114

Gaudet10: Gaudet P, Livstone M, Thomas P (2010). "Annotation inferences using phylogenetic trees." PMID: 19578431

Gerdes03: Gerdes SY, Scholle MD, Campbell JW, Balazsi G, Ravasz E, Daugherty MD, Somera AL, Kyrpides NC, Anderson I, Gelfand MS, Bhattacharya A, Kapatral V, D'Souza M, Baev MV, Grechkin Y, Mseeh F, Fonstein MY, Overbeek R, Barabasi AL, Oltvai ZN, Osterman AL (2003). "Experimental determination and system level analysis of essential genes in Escherichia coli MG1655." J Bacteriol 185(19);5673-84. PMID: 13129938

GOA01: GOA, MGI (2001). "Gene Ontology annotation based on Enzyme Commission mapping." Genomics 74;121-128.

GOA01a: GOA, DDB, FB, MGI, ZFIN (2001). "Gene Ontology annotation through association of InterPro records with GO terms."

Hidese11: Hidese R, Mihara H, Kurihara T, Esaki N (2011). "Escherichia coli dihydropyrimidine dehydrogenase is a novel NAD-dependent heterotetramer essential for the production of 5,6-dihydrouracil." J Bacteriol 193(4);989-93. PMID: 21169495

Joyce06: Joyce AR, Reed JL, White A, Edwards R, Osterman A, Baba T, Mori H, Lesely SA, Palsson BO, Agarwalla S (2006). "Experimental and computational assessment of conditionally essential genes in Escherichia coli." J Bacteriol 188(23);8259-71. PMID: 17012394

Lasserre06: Lasserre JP, Beyne E, Pyndiah S, Lapaillerie D, Claverol S, Bonneu M (2006). "A complexomic study of Escherichia coli using two-dimensional blue native/SDS polyacrylamide gel electrophoresis." Electrophoresis 27(16);3306-21. PMID: 16858726

Mihara08: Mihara H, Hidese R, Yamane M, Kurihara T, Esaki N (2008). "The iscS gene deficiency affects the expression of pyrimidine metabolism genes." Biochem Biophys Res Commun 372(3);407-11. PMID: 18482579

Reed03: Reed JL, Vo TD, Schilling CH, Palsson BO (2003). "An expanded genome-scale model of Escherichia coli K-12 (iJR904 GSM/GPR)." Genome Biol 4(9);R54. PMID: 12952533

Schembri03: Schembri MA, Kjaergaard K, Klemm P (2003). "Global gene expression in Escherichia coli biofilms." Mol Microbiol 48(1);253-67. PMID: 12657059

Serres01: Serres MH, Gopal S, Nahum LA, Liang P, Gaasterland T, Riley M (2001). "A functional update of the Escherichia coli K-12 genome." Genome Biol 2(9);RESEARCH0035. PMID: 11574054

UniProt11: UniProt Consortium (2011). "UniProt version 2011-06 released on 2011-06-30 00:00:00." Database.

UniProtGOA11a: UniProt-GOA (2011). "Gene Ontology annotation based on manual assignment of UniProtKB keywords in UniProtKB/Swiss-Prot entries."

Other References Related to Gene Regulation

MendozaVargas09: Mendoza-Vargas A, Olvera L, Olvera M, Grande R, Vega-Alvarado L, Taboada B, Jimenez-Jacinto V, Salgado H, Juarez K, Contreras-Moreira B, Huerta AM, Collado-Vides J, Morett E (2009). "Genome-wide identification of transcription start sites, promoters and transcription factor binding sites in E. coli." PLoS One 4(10);e7526. PMID: 19838305

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Please cite the following article in publications resulting from the use of EcoCyc: Nucleic Acids Research 41:D605-12 2013
Page generated by SRI International Pathway Tools version 19.0 on Mon Oct 5, 2015, biocyc14.