TPS3/YMR261C Summary Help

Standard Name TPS3
Systematic Name YMR261C
Feature Type ORF, Verified
Description Regulatory subunit of trehalose-6-phosphate synthase/phosphatase; involved in synthesis of storage carbohydrate trehalose; expression is induced by stress conditions and repressed by the Ras-cAMP pathway; TPS3 has a paralog, TSL1, that arose from the whole genome duplication (1, 2, 3 and see Summary Paragraph)
Name Description Trehalose-6-Phosphate Synthase
Chromosomal Location
ChrXIII:793369 to 790205 | ORF Map | GBrowse
Note: this feature is encoded on the Crick strand.
Gene Ontology Annotations All TPS3 GO evidence and references
  View Computational GO annotations for TPS3
Molecular Function
Manually curated
Biological Process
Manually curated
Cellular Component
Manually curated
Regulators 6 genes
Classical genetics
Large-scale survey
79 total interaction(s) for 51 unique genes/features.
Physical Interactions
  • Affinity Capture-MS: 23
  • Affinity Capture-RNA: 1
  • PCA: 3
  • Two-hybrid: 3

Genetic Interactions
  • Dosage Lethality: 1
  • Negative Genetic: 23
  • Phenotypic Enhancement: 1
  • Positive Genetic: 18
  • Synthetic Growth Defect: 4
  • Synthetic Lethality: 2

Expression Summary
Length (a.a.) 1,054
Molecular Weight (Da) 118,834
Isoelectric Point (pI) 6.33
Phosphorylation PhosphoGRID | PhosphoPep Database
sequence information
ChrXIII:793369 to 790205 | ORF Map | GBrowse
Note: this feature is encoded on the Crick strand.
Last Update Coordinates: 2011-02-03 | Sequence: 1996-07-31
Subfeature details
Most Recent Updates
Coordinates Sequence
CDS 1..3165 793369..790205 2011-02-03 1996-07-31
Retrieve sequences
Analyze Sequence
S288C only
S288C vs. other species
S288C vs. other strains
External Links All Associated Seq | Entrez Gene | Entrez RefSeq Protein | MIPS | Search all NCBI (Entrez) | UniProtKB
Primary SGDIDS000004874

In Saccharomyces cerevisiae, trehalose is a major reserve carbohydrate involved in reponses to thermal, osmotic, oxidative, and ethanol stresses (4), as well as the suppression of denatured protein aggregation (5). Trehalose biosynthesis is a two-step process in which glucose 6-phosphate and UDP-glucose are converted by trehalose-6-phosphate synthase (TPS), encoded by TPS1, into alpha,alpha-trehalose 6-phosphate, which is then converted with water into trehalose and phosphate by trehalose-6-phosphate phosphatase (TPP), encoded by TPS2 (6). The trehalose biosynthetic pathway can affect glycolysis in that one of its intermediates, trehalose-6-phosphate, inhibits hexokinase activity, which restricts the influx of sugars to glycolysis during the switch to fermentative metabolism (7).

Tps1p and Tps2p are part of the alpha,alpha-trehalose-phosphate synthase complex (8, 9) with Tps3p and Tsl1p, regulatory proteins with partially overlapping functions (10), though some Tps1p appears to be present in the cell as a monomer (2). TPS1, TPS2, TPS3 and TSL1 are coinduced under stress conditions, and corepressed by the Ras-cAMP pathway (1).

Deletion of TPS1 results in loss of both TPS activity and trehalose biosynthesis (8), whereas deletion of TPS2 results in temperature sensitivity and loss of TPP activity (9). Deletion of either TPS1 or TPS2 results in a growth defect on fermentable carbon sources (8, 9). Deletion of either TPS3 or TSL1 has only mild effects, but deletion of both TPS3 and TSL1 results in significant reductions in TPS and TPP activities, as well as reduced trehalose biosynthesis (2).

Last updated: 2005-08-04 Contact SGD

References cited on this page View Complete Literature Guide for TPS3
1) Winderickx J, et al.  (1996) Regulation of genes encoding subunits of the trehalose synthase complex in Saccharomyces cerevisiae: novel variations of STRE-mediated transcription control? Mol Gen Genet 252(4):470-82
2) Bell W, et al.  (1998) Composition and functional analysis of the Saccharomyces cerevisiae trehalose synthase complex. J Biol Chem 273(50):33311-9
3) Byrne KP and Wolfe KH  (2005) The Yeast Gene Order Browser: combining curated homology and syntenic context reveals gene fate in polyploid species. Genome Res 15(10):1456-61
4) Pereira MD, et al.  (2001) Acquisition of tolerance against oxidative damage in Saccharomyces cerevisiae. BMC Microbiol 1():11
5) Singer MA and Lindquist S  (1998) Multiple effects of trehalose on protein folding in vitro and in vivo. Mol Cell 1(5):639-48
6) Francois J and Parrou JL  (2001) Reserve carbohydrates metabolism in the yeast Saccharomyces cerevisiae. FEMS Microbiol Rev 25(1):125-45
7) Hohmann S, et al.  (1996) Evidence for trehalose-6-phosphate-dependent and -independent mechanisms in the control of sugar influx into yeast glycolysis. Mol Microbiol 20(5):981-91
8) Bell W, et al.  (1992) Characterization of the 56-kDa subunit of yeast trehalose-6-phosphate synthase and cloning of its gene reveal its identity with the product of CIF1, a regulator of carbon catabolite inactivation. Eur J Biochem 209(3):951-9
9) De Virgilio C, et al.  (1993) Disruption of TPS2, the gene encoding the 100-kDa subunit of the trehalose-6-phosphate synthase/phosphatase complex in Saccharomyces cerevisiae, causes accumulation of trehalose-6-phosphate and loss of trehalose-6-phosphate phosphatase activity. Eur J Biochem 212(2):315-23
10) Vuorio OE, et al.  (1993) Cloning of two related genes encoding the 56-kDa and 123-kDa subunits of trehalose synthase from the yeast Saccharomyces cerevisiae. Eur J Biochem 216(3):849-61