Dictionary > Treponema pallidum

Treponema pallidum

A gram-negative bacterium with flagella in the periplasmic space causing it to move like a corkscrew fashion involved as causative agents of syphilis in humans.
Treponema pallidum has a helical shape and microaerophilic containing a small genome with 1041 coding proteins that lacks various pathways such as tricarboxylic acid cycle and biosynthetic pathways needed for essential functions. It has an inner membrane of thin peptidoglycan cell wall in which size has a length ranging from 6-20 micrometer with a diameter of 18-20 micrometer. It also has an interesting structure of endoflagella located at the periplasmic space between its two membranes.
Treponema pallidum is a microaerophilic that requires very low concentration of oxygen wherein it does not code for several enzymes and incapable to synthesize fatty acids, enzyme cofactors, nucleotides and amino acids. It contains enzymes needed for glycolysis but deficient for the citric acid cycle and oxidative phosphorylation.
Treponema pallidum is implicated in syphilis, a sexually transmitted chronic human disease that able to penetrate the host via roughened mucous membrane and has the ability to cause disease like various hemolysins.
Scientific classification:
Domain: Bacteria
Phylum: Spirochaetes
Order: Spirochaetales
Family: Spirochaetaceae
Genus: Treponema
Species: Treponema pallidum
See also:
• Bacteria
• Syphilis

You will also like...

The Human Physiology
The Human Physiology

Physiology is the study of how living organisms function. Thus, human physiology deals specifically with the physiologic..


Bryophytes are a plant group characterized by being nonvascular. They include the mosses, the liverworts, and the hornwo..

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..

Ecosystem Succession
Ecosystem Succession

If the balance of nature is left untouched, landscapes can change dramatically over time. A previous ecosystem is supers..

Flowers and tiny fruits of the pomegranate plant
Fruits, Flowers, and Seeds

This tutorial deals with the structure and function of flowers, fruits, and seeds. Also included here are the types of f..

A sperm cell fertilizing an ovum
Human Reproduction and Fertilization

For human species to obviate extinction, reproductive mature adults should be producing viable offspring in order to con..