Nucleotide Sugar Transporters
Nucleotide Sugar Transporters - Related Videos
02:10
Phloem and Sugar Transport
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2026
Like many living organisms, plants have tissues that specialize in specific plant functions. For example, shoots are well adapted to rapid growth, while roots are structured to acquire resources efficiently. However, sugar production is primarily restricted to the photosynthetic tissues that reside in the leaves of angiosperm plants. Sugar and other resources are transported from photosynthetic cells to other specialized tissues by a process called translocation.Within a plant, tissues that...
11:16
Progressive-ratio Responding for Palatable High-fat and High-sugar Food in Mice
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Cited by 70 •
2012
The present report details the protocol employed to measure the rewarding effects of high-fat food in mice using a progressive ratio operant conditioning task.
01:10
Sugars as Energy Storage Molecules
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2023
Sugar (a simple carbohydrate) metabolism (chemical reactions) is a classic example of the many cellular processes that use and produce energy. Living things consume sugar as a major energy source because sugar molecules have considerable energy stored within their bonds. Consumed carbohydrates have their origins in photosynthesizing organisms like plants. During photosynthesis, plants use the energy of sunlight to convert carbon dioxide gas into sugar molecules, like glucose. Because this...
01:10
Sugars as Energy Storage Molecules
0 Views •
2023
Sugar (a simple carbohydrate) metabolism (chemical reactions) is a classic example of the many cellular processes that use and produce energy. Living things consume sugar as a major energy source because sugar molecules have considerable energy stored within their bonds. Consumed carbohydrates have their origins in photosynthesizing organisms like plants. During photosynthesis, plants use the energy of sunlight to convert carbon dioxide gas into sugar molecules, like glucose. Because this...
01:46
Nucleotide Excision Repair
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2020
Exposure to mutagens can damage DNA and result in bulky lesions that distort the double-helix structure or impede proper transcription. Damaged DNA can be detected and repaired in a process called nucleotide excision repair (NER). NER employs a set of specialized proteins that first scan DNA to detect a damaged region. Next, NER proteins separate the strands and excise the damaged area. Finally, they coordinate the replacement with new, matching nucleotides.DNA distortion and damageCells are...
FAQs
The exchange cycle couples two movements: a cytosolic activated sugar nucleotide enters the compartment while a lumenal nucleoside monophosphate moves out. This antiport arrangement links transporter activity to substrate availability inside the endoplasmic reticulum or Golgi. It consequently regulates whether glycosyltransferases can access nucleotide sugars needed to modify glycoconjugates.
The lumenal nucleoside monophosphate participates directly in the exchange cycle rather than serving as an unrelated byproduct. Its movement out of the compartment is paired with entry of cytosolic UDP-galactose, GDP-mannose, or another activated sugar nucleotide. This distinguishes the process from simple one-way delivery and helps sustain substrate access for glycan synthesis.
Placement in the endoplasmic reticulum or Golgi membrane determines which intracellular lumen receives the activated sugar nucleotide. That location is important because glycosyltransferases act within these secretory-pathway compartments, where they modify proteins, lipids, and other glycoconjugates. Transporter position therefore helps connect substrate delivery with the compartment-specific production of glycans.
The transported substrates include activated sugars such as UDP-galactose and GDP-mannose, which originate on the cytosolic side of the membrane. Once delivered into the appropriate compartment, they supply glycosyltransferases that modify proteins, lipids, and other glycoconjugates. Examining both the sugar nucleotide and its downstream target clarifies how substrate access shapes glycan assembly.
Changes in transporter-mediated substrate access can alter glycosylation patterns and, in turn, affect cell-surface properties and secretory-pathway function. These outcomes provide useful biological readouts when studying how intracellular glycan synthesis is regulated. They also help connect a membrane transport step with broader changes in the composition and behavior of cell-associated glycoconjugates.
Their role in controlling glycosylation connects them to congenital glycosylation disorders and to host-pathogen interactions, where glycan-dependent biology is important. The same system matters in therapeutic protein production because glycosylation influences products made through secretory pathways. Researchers also study these transporters as possible points for manipulating glycan-dependent biological processes.