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...

Pink Lotus plant on a pond
Freshwater Lentic Communities & Animals

This tutorial looks at some of the communities in freshwater lentic habitats. For instance, symbiosis occurs in a commun..

Birth Control and Contraception
Birth Control and Contraception

Different pregnancy and birth control and contraception strategies are described. Read this tutorial to learn each of th..

Growth Patterns
Growth Patterns

This tutorial describes the sigmoid curve, annual plant growth, tree growth, human growth, and insect growth as the grow..

Growth and Plant Hormones
Growth and Plant Hormones

Plants, like animals, produce hormones to regulate plant activities, including growth. They need these hormones to respo..

Psychiatry and mental disorders
Psychiatry & Mental Disorders

Different mental disorders are described here. Read this tutorial to get an overview of schizophrenia, affective mood di..

Population Growth and Survivorship
Population Growth and Survivorship

This lesson looks at population attributes, regulation, and growth. It also covers population genetics, particularly gen..