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...

The Dinosaurs

Dinosaurs represented a major turn in the evolutionary development of organisms on Earth. The first dinosaurs were presu..

Gibberellins and Gibberellic Acid
Gibberellins and Gibberellic Acid

This tutorial describes the role of gibberellin family in plants. Find out the effects of gibberellin on plant growth an..

Disturbance on a still water
Abiotic Factors – Water Conditions

A still body of water may be disturbed by a variety of factors. One of them is wind. In fact, it is considered as the pr..

Plant biology
Plant Biology

Plantlife can be studied at a variety of levels, from the molecular, genetic and biochemical level through organelles, c..

Body temperature regulation by the hypothalamus
Temperature Regulation in Animals

This tutorial elucidates body temperature regulation. Know the details here to learn how the body sets the body temperat..

Protein Synthesis

Part of the genetic information is devoted to the synthesis of proteins. mRNA, a type of RNA, is produced as a transcri..