MAY 29, 2016 05:51 PM PDT

Better Know a Microbe: Vampire Amoebas!

WRITTEN BY: Kerry Evans
Vampyrellids are teeny-tiny vampires. Okay, technically they’re single-celled amoebas that belong to the family Vampyrellidae. (“Teeny-tiny vampires” is way more interesting.)

These so-called “vampire amoebas” were discovered by Leon Semenowitj Cienkowski way back in 1865. They come in various shapes but are typically between 30-100 microns long. The majority are spherical with “filose pseudopods” extending from the cell body (think spheres with long spikes sticking out). The cells are free-living and live in water and soil. (Watch out for the tiny vampires under your feet!)
 
A vampire amoeba preys on green algae.

But, what makes them “vampires”? Unlike other amoebas that essentially engulf their prey, the vampire amoebas feed on their prey (algae, fungi, and even nematodes!) by poking holes in their cells and sucking out all the (yummy) juices. Hence, vampires.

A study from the 1920s described the process quite colorfully. First, the amoeba “spreads partly around the doomed cell”. Then, “within a minute or so the transverse walls of the attacked cell begin to bend gradually inward”. Once the amoeba pokes a hole in the “doomed cell”, the amoeba swells due to “the injection of algal cell contents into the animal through an oval opening”.

After feeding, the free-living amoebas join together and build “digestive cysts” where they digest their latest meal and also reproduce.

These vampires even made the news recently. UC Santa Barbara paleobiologist Susannah Porter reported finding tiny holes drilled into fossilized eukaryotes found near the Grand Canyon. She thinks these holes were probably made by vampire amoebas nearly 740 million years ago! (They’re even older than Dracula!)

There’s still one big unanswered question about the little vampires - how do they manage to poke holes in tough, rigid cell walls? According to Sebastian Hess at the University of Cologne, “the perforation of the cell wall … can be done in five to ten minutes … they must have a set of enzymes which can digest plant cell walls”.

The answer to this question could be very useful for companies interested in making biofuels from algae. Algae are easy to grow, but breaking down their cell walls isn’t so straightforward.

Sources: BBC, UC Santa Barbara, Science, Encyclopedia of Life, Wikipedia
About the Author
  • Kerry received a doctorate in microbiology from the University of Arkansas for Medical Sciences.
You May Also Like
OCT 15, 2019
Microbiology
OCT 15, 2019
Engineering Bacteria to be Tumor Assassins
Some cutting-edge techniques are being combined to create powerful and innovative therapeutics....
OCT 15, 2019
Microbiology
OCT 15, 2019
Artificial Mother-of-pearl, Made by Bacteria
Mother Nature has produced some very durable, tough materials, and some of the best synthetic materials are based on natural products....
OCT 15, 2019
Microbiology
OCT 15, 2019
Is Climate Change to Blame for the Rise of Candida auris?
In recent years, the fungus Candida auris has emerged as a growing public health threat. The infection is usually serious and tough to treat effectively....
OCT 15, 2019
Microbiology
OCT 15, 2019
Antidepressants and Serotonin Impact Gut Microbiota
About 90% of the serotonin found in the human body is made in the gut. Some bacteria can encourage the release of serotonin from gut cells....
OCT 15, 2019
Genetics & Genomics
OCT 15, 2019
Rearranging Whole Chromosomes with CRISPR
CRISPR/Cas9 was developed as a gene-editing tool and now it's going beyond small, targeted changes in the genome....
OCT 15, 2019
Health & Medicine
OCT 15, 2019
Honey As An Antibacterial Against Methicillin-Resistant Staphylococcus Aureus
Honey has been used for its medicinal properties for thousands of years to treat wound infections, gastrointestinal ailments, and burns. Because of th...
Loading Comments...