What is human carbonic anhydrase II?
Human carbonic anhydrase II (HCA II) is a monomeric zinc-containing metalloenzyme that catalyzes the hydration of CO2 to form bicarbonate and a proton. The properties of the zinc have been extensively elucidated in catalysis, but less well studied as a contributor to structure and stability.
What does proximal promoter do?
Promoter-proximal elements – Any regulatory sequence in eukaryotic DNA that is located close to (within 200 base pairs) a promoter and binds a specific protein thereby modulating transcription of the associated protein coding gene.
How are promoters activated?
Transcription from promoters is activated through cues by certain sequences called enhancers. This ensures that each gene is expressed in specific cells at a specific time point – ultimately orchestrating the rise of the diverse cell types that make up complex organisms.
What is the role of the carbonic anhydrase enzyme in the transport of gases during respiration?
An enzyme present in red blood cells, carbonic anhydrase, aids in the conversion of carbon dioxide to carbonic acid and bicarbonate ions. When red blood cells reach the lungs, the same enzyme helps to convert the bicarbonate ions back to carbon dioxide, which we breathe out.
What is the role of the carbonic anhydrase enzyme in the transport of gases during respiration explain with the help of an equation?
carbonic anhydrase, enzyme found in red blood cells, gastric mucosa, pancreatic cells, and renal tubules that catalyzes the interconversion of carbon dioxide (CO2) and carbonic acid (H2CO3). Carbonic anhydrase plays an important role in respiration by influencing CO2 transport in the blood.
Where is carbonic anhydrase 2 found?
Carbonic anhydrase facilitates the conversion of CO2 and H2O to H2CO3 (188). Carbonic anhydrase II is located in the cytosol of all acidifying renal tubules and comprises 95% of carbonic anhydrase activity in the kidney (108).
What is the role of promoter region of a gene?
A promoter, as related to genomics, is a region of DNA upstream of a gene where relevant proteins (such as RNA polymerase and transcription factors) bind to initiate transcription of that gene. The resulting transcription produces an RNA molecule (such as mRNA).
What is the function of promoter gene?
Promoter sequences define the direction of transcription and indicate which DNA strand will be transcribed; this strand is known as the sense strand. Many eukaryotic genes have a conserved promoter sequence called the TATA box, located 25 to 35 base pairs upstream of the transcription start site.
What is the function of a promoter in biology?
What binds to the promoter sequence?
RNA polymerase and the necessary transcription factors bind to the promoter sequence and initiate transcription. Promoter sequences define the direction of transcription and indicate which DNA strand will be transcribed; this strand is known as the sense strand.
What is carbonic anhydrase 2?
Carbonic Anhydrase II. Carbonic anhydrase II (CAII) is the only soluble form of the enzyme and regulates the acid–base homeostasis in erythrocytes and the aqueous chambers of the eyes and renal tubules.
What is the mechanism of action of carbonic anhydrase inhibitors?
Carbonic anhydrase (CA) inhibitors block CA on the luminal membrane and inside proximal tubule cells (Fig. 9-3). Inhibition of CA in the cytoplasm of proximal tubule cells causes a decrease in secretion of H + through the Na +/H + antiporter.
What is the role of carbonic anhydrase in photosynthesis?
In plants, carbonic anhydrase helps raise the concentration of CO 2 within the chloroplast in order to increase the carboxylation rate of the enzyme RuBisCO. This is the reaction that integrates CO 2 into organic carbon sugars during photosynthesis, and can use only the CO 2 form of carbon, not carbonic acid or bicarbonate.
What is the active site of carbonic anhydrases?
The carbonic anhydrases (or carbonate dehydratases) form a family of enzymes that catalyze the interconversion between carbon dioxide and water and the dissociated ions of carbonic acid (i.e. bicarbonate and hydrogen ions ). The active site of most carbonic anhydrases contains a zinc ion.