Dictionary > Hsk pathway

Hsk pathway

Definition
noun
An abbreviation for hatch slack kortshak pathway: a metabolic pathway first determined by Burr and Kortshak in their experiments that later led to its in-depth description by M. D. Hatch and C. R. Slack (in 1966).
In this pathway, the CO2 is first added to phosphoenolpyruvate by the enzyme, PEP carboxylase, producing the four-carbon compound in mesophyll cells that is later transported to bundle sheath cells to liberate the CO2 for use in the Calvin cycle.
Supplement
Instead of the direct carbon fixation in the Calvin cycle like in C3 carbon fixation, the C4 pathway involves steps that first converts pyruvate to phosphoenolpyruvate (PEP) to bind with the CO2 forming a four-carbon compound (hence the name C4). As a result, the photorespiration pathway is bypassed, and the wasteful loss of CO2 common in C3 carbon fixation pathway is minimized.
Plants that first go through the C4 pathway are better adapted than plants that solely go through the C3 pathway under conditions of drought, high temperatures and low nitrogen or CO2 concentrations.
Synonym: Hatch slack kortshak pathway, C4 carbon fixation pathway.

Compare: C3 carbon fixation pathway, Crassulacean acid metabolism.

See also: C4 plant.


You will also like...

kinesin motor proteins transporting molecules across microtubules
Movement of Molecules Across Cell Membranes

Molecules move within the cell or from one cell to another through different strategies. Transport may be in the form of..

Structural depiction of catalase, an enzyme
Protein Activity and Cellular Metabolism

Proteins have a crucial role in various biological activities. Get to know how proteins are able to perform as enzymes, ..

Homo Species
The Homo Species

The evolution of the species of the genus "Homo" led to the emergence of modern humans. Find out more about human evolut..

Cell structure
Cell Structure

A typical eukaryotic cell is comprised of cytoplasm with different organelles, such as nucleus, endoplasmic reticulum, G..

Freshwater aquatic plankton
Freshwater Communities & Plankton

Planktons are microscopic organisms that live suspended in aquatic habitats. There are two groups: the phytoplanktons an..

Evolution of Life - Ancient Earth
Evolution of Life – Ancient Earth

Autotrophs flourished, absorbing carbon and light. Soon after, primitive life forms that could assimilate oxygen thrived..

Related Articles...

No related articles found

See all Related Topics