Dictionary > Octose


noun, plural: octoses
An eight -carbon monosaccharide or sugar
Monosaccharides are the simplest form of carbohydrates. They are classified according to the number of carbon atoms in a monosaccharide. In particular, an octose is a monosaccharide with eight 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 aldooctose would be an octose with an aldehyde group. A ketooctose, in contrast, would be an octose with a ketone functional group.
Octoses have a chemical formula of C8H16O8. An example is methylthiolincosamide, i.e. the sugar moiety of the antimicrobial agent lincomycin A. This antibiotic has been used to treat Gram-positive infections. The ostose moiety is linked to an amino acid derivative (i.e. propulhygric acid) via an amide bond. The biosynthesis of lincomycin involves a metabolic pathway comprised of two phases. In the first phase, methylthiolincosamide and propylproline are produced separately. They are condensed to form N-demethylincomycin. This is then methylated through S-adenosylmethionine.
Word origin: oct(o)– (“eight”) + –ose (relating to sugars)
See also:

You will also like...

Gene Regulation in Eukaryotes
Gene Regulation in Eukaryotes

This tutorial is about genetic regulation in eukaryotes. Learn about the general structure of a eukaryotic gene, the tra..

Sigmund Freud and Carl Gustav Jung
Sigmund Freud and Carl Gustav Jung

In this tutorial, the works of Carl Gustav Jung and Sigmund Freud are described. Both of them actively pursued the way h..

Freshwater lake ecosystem
Freshwater Producers and Consumers

Freshwater ecosystem is comprised of four major constituents, namely elements and compounds, plants, consumers, and deco..


The circulatory system is key to the transport of vital biomolecules and nutrients throughout the body. Learn about the ..

Human Nervous System
The Human Nervous System

The nervous system is essentially a biological information highway. This tutorial gives an overview of the nervous syste..

Young plant growing from the soil.

Nutrients in the soil are essential to the proper growth of a land plant. This tutorial deals with the properties of soi..