Sugar signal transduction is an evolutionarily conserved mechanism used by organisms to survive. Sugars have an overwhelming effect on

gene expression Gene expression is the process by which information from a gene is used in the synthesis of a functional gene product that enables it to produce end products, protein or non-coding RNA, and ultimately affect a phenotype, as the final effect. ...

. In

yeast Yeasts are eukaryotic, single-celled microorganisms classified as members of the fungus kingdom. The first yeast originated hundreds of millions of years ago, and at least 1,500 species are currently recognized. They are estimated to consti ...

glucose Glucose is a simple sugar with the molecular formula . Glucose is overall the most abundant monosaccharide, a subcategory of carbohydrates. Glucose is mainly made by plants and most algae during photosynthesis from water and carbon dioxide, usi ...

levels are managed by controlling the

mRNA In molecular biology, messenger ribonucleic acid (mRNA) is a single-stranded molecule of RNA that corresponds to the genetic sequence of a gene, and is read by a ribosome in the process of synthesizing a protein. mRNA is created during the ...

levels of hexose transporters, while in

mammals Mammals () are a group of vertebrate animals constituting the class Mammalia (), characterized by the presence of mammary glands which in females produce milk for feeding (nursing) their young, a neocortex (a region of the brain), fu ...

, the response to glucose is more tightly controlled with glucose metabolism and is therefore much more complex. Several glucose-responsive DNA motifs and DNA binding protein complexes have been identified in liver and

b-cells B cells, also known as B lymphocytes, are a type of white blood cell of the lymphocyte subtype. They function in the humoral immunity component of the adaptive immune system. B cells produce antibody molecules which may be either secreted or ...

. Although not proven, glucose

repression Repression may refer to: * Memory inhibition, the ability to filter irrelevant memories from attempts to recall * Political repression, the oppression or persecution of an individual or group for political reasons * Psychological repression, the p ...

appears to be conserved in plants because in many cases, both sugar induction and sugar repression are initiated by turning off

transcription factors In molecular biology, a transcription factor (TF) (or sequence-specific DNA-binding factor) is a protein that controls the rate of transcription of genetic information from DNA to messenger RNA, by binding to a specific DNA sequence. The f ...

References

*Xiao W, Sheen J, Jang JC. "The role of hexokinase in plant sugar signal transduction and growth and development." ''Plant Molecular Biology.'' 2000 Nov;44(4):451-61 Evolutionary biology Glycobiology

See also

References