Dictionary > Heptose

Heptose

Definition
noun, plural: heptoses
A seven-carbon monosaccharide or sugar
Supplement
Monosaccharides are the simplest form of carbohydrates. They are classified according to the number of carbon atoms in a monosaccharide. In particular, a heptose is a monosaccharide with seven carbon atoms. Monosaccharides may also be classified based on the type of carbonyl group they contain. An aldose is a monosaccharide that contains an aldehyde group (-CHO) at position 1 whereas a ketose is one that contains a ketone (C=O) at position 2. Thus, an aldoheptose is a heptose with an aldehyde group. A ketoheptose, in contrast, is a heptose with a ketone functional group located in position 2.
Aldoheptoses have five chiral centers. An example of a naturally-occurring aldoheptose is L-glycero-D-manno-heptose. It is a heptose with a chemical formula of C7H14O7. It is an intermediate in lipid A biosynthesis. It occurs in plants, e.g. carrots, apricots, and apples.
Ketoheptoses have four chiral centers. An example of a naturally-occurring ketoheptose is sedoheptulose. It has a chemical formula of C7H14O7. It is an early intermediate in lipid A biosynthesis. It is found in alfalfa, avocado, and fig. Another example of a ketoheptose is mannoheptulose. It is a heptose found in avocados.
Word origin: hept(a)– (“seven”) + –ose (relating to sugars)
See also:


You will also like...

Golgi apparatus (3-D illustration)
Role of Golgi Apparatus & Endoplasmic Reticulum in Protein Synthesis

The endoplasmic reticulum and Golgi apparatus are the organelles involved in the translation step of protein synthesis a..

Population Regulation in an Ecosystem
Population Regulation in an Ecosystem

With regard to the population size of a species and what factors may affect them, two factors have been defined. They ar..

human respiratory system
Respiration

The human respiratory system is an efficient system of inspiring and expiring respiratory gases. This tutorial provides ..

Balanced Diet
A Balanced Diet – Minerals and Proteins

Proteins and minerals can be derived from various dietary sources. They are essential for the proper growth and developm..

Gene Pool and Speciation
The Gene Pool and Population Genetics

According to Charles Darwin's theory of natural selection, preferable genes are favored by nature in the gene pool, and ..

Salmon jumping upstream in the river
Lotic Communities & Animals

A running water environment offers numerous microhabitats for many types of animals. Similar to plants, animals in lotic..