Search results
Results from the WOW.Com Content Network
The most ubiquitous Ca 2+-sensing protein, found in all eukaryotic organisms including yeasts, is calmodulin. Intracellular storage and release of Ca 2+ from the sarcoplasmic reticulum is associated with the high-capacity, low-affinity calcium-binding protein calsequestrin. [3] Calretinin is another type of Calcium binding protein weighing 29kD ...
Many of Ca 2+ mediated events occur when the released Ca 2+ binds to and activates the regulatory protein calmodulin. Calmodulin may activate the Ca 2+-calmodulin-dependent protein kinases, or may act directly on other effector proteins. [15] Besides calmodulin, there are many other Ca 2+-binding proteins that mediate the biological effects of ...
The Ca 2+ concentration of the vacuole may reach millimolar levels. The most striking use of Ca 2+ ions as a structural element in algae occurs in the marine coccolithophores, which use Ca 2+ to form the calcium carbonate plates, with which they are covered. Calcium is needed to form the pectin in the middle lamella of newly formed cells.
A variety of different ions, including Calcium (Ca 2+), play a vital role in the regulation of cellular functions.Calmodulin, a Calcium-binding protein, that mediates Ca 2+ signaling is involved in all types of cellular mechanisms, including metabolism, synaptic plasticity, nerve growth, smooth muscle contraction, etc. Calmodulin allows for a number of proteins to aid in the progression of ...
This allows Ca 2+ to pass into the cell, increasing the local Ca 2+ concentration, around the RyR. When four Ca 2+ molecules bind to the RyR, it opens, resulting in a larger release of Ca 2+, from the SR . This process, of using Ca 2+ to activate release of Ca 2+ from the SR is known as calcium-induced calcium release. [11]
Excitation-contraction coupling in myocardium relies on sarcolemma depolarization and subsequent Ca 2+ entry to trigger Ca 2+ release from the sarcoplasmic reticulum.When an action potential depolarizes the cell membrane, voltage-gated Ca 2+ channels (e.g., L-type calcium channels) are activated.
The plasma total calcium concentration is in the range of 2.2–2.6 mmol/L (9–10.5 mg/dL), and the normal ionized calcium is 1.3–1.5 mmol/L (4.5–5.6 mg/dL). [4] The amount of total calcium in the blood varies with the level of plasma albumin, the most abundant protein in plasma, and therefore the main carrier of protein-bound calcium in the blood.
SPCA is found primarily in the membranes of the golgi apparatus in increasing concentrations from the cis- to the trans-golgi compartments. Following a calcium spike, SPCA proteins are responsible for transporting Ca 2+ ions from the cytosol to the lumen of the golgi, thus lowering the cytoplasmic concentrations of Ca 2+ to resting levels.