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Aromatic Hydrocarbon Cations: Structural Overview01:18

Aromatic Hydrocarbon Cations: Structural Overview

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Cycloheptatriene is a neutral monocyclic unsaturated hydrocarbon that consists of an odd number of carbon atoms and an intervening sp3 carbon in the ring. The three double bonds in the ring correspond to 6 π electrons, which is a Huckel number, and therefore satisfies the criteria of 4n + 2 π electrons. However, the intervening sp3 carbon disrupts the continuous overlap of p orbitals. As a result, cycloheptatriene is not aromatic.
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Aromatic Hydrocarbon Anions: Structural Overview01:18

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Neutral hydrocarbons like cyclopentadiene with an odd number of carbon atoms and one intervening CH2 group in the ring are not aromatic. Cyclopentadiene with 4 π electrons does not satisfy the 4n + 2 π electron rule. Additionally, the intervening CH2 group is sp3 hybridized and lacks a vacant p orbital, thereby interrupting the overlap of p orbitals in a continuous manner and preventing the delocalization of π electrons throughout the ring.
Due to the absence of continuous...
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ATP Driven Pumps III: V-type Pumps01:30

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V-type pumps are ATP-driven pumps found in the vacuolar membranes of plants, yeast, endosomal and lysosomal membranes of animal cells, plasma membranes of a few specialized eukaryotic cells, and some prokaryotes. They are also known as the V1Vo-ATPase, that couple ATP hydrolysis to transport protons against a concentration gradient.
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Structure of Carboxylic Acid Derivatives
Carboxylic acid derivatives contain an acyl group attached to a heteroatom such as chlorine, oxygen, or nitrogen. The carbonyl carbon and oxygen are both sp2-hybridized with an unhybridized p orbital.
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Bicarbonate-Carbonic Acid Buffer

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The carbonic acid-bicarbonate buffer system is critical for maintaining the body's pH balance. It operates on the equilibrium:
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Structure of Cadherins01:25

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The cadherins were one of the first cell adhesion molecules discovered; the term “cadherins”   is based on their calcium-dependent adhering properties. The first cadherins discovered on the epithelial, neuronal, and placental cells were named E-cadherin, P-cadherin, and N-cadherin, respectively. These classical cadherins share sequence and structural similarities. Other cadherins, including those involved in cell signaling, are grouped into non-classical cadherins. This...
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Thermal-stable carbonic anhydrases: a structural overview.

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Thermostable carbonic anhydrases (CAs) from extremophiles are promising biocatalysts for CO2 capture and biofuel production. Alpha-carbonic anhydrases show the most potential for biotechnological applications, though further protein engineering is beneficial.

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Area of Science:

  • Biochemistry
  • Biotechnology
  • Enzyme Engineering

Background:

  • Carbonic anhydrases (CAs) are recognized drug targets, with emerging industrial interest in their use as biocatalysts.
  • Industrial applications like CO2 sequestration and biofuel production require robust enzymes stable under harsh process conditions.
  • High-temperature active CAs are of significant interest for efficient CO2 capture processes.

Purpose of the Study:

  • To comparatively summarize existing data on thermostable CAs.
  • To discuss biochemical and structural features of thermostable alpha-, beta-, and gamma-CAs.
  • To evaluate the potential of thermostable CAs for biotechnological applications.

Main Methods:

  • Literature review and comparative analysis of existing data on thermostable CAs.
  • Focus on CAs isolated from extremophiles and those developed through protein engineering.
  • Discussion of biochemical and structural characteristics of alpha-, beta-, and gamma-CA classes.

Main Results:

  • Thermostable CAs have been isolated from extremophiles and engineered.
  • Biochemical and structural features of thermostable alpha-, beta-, and gamma-CAs were analyzed.
  • Alpha-CAs from thermophilic organisms currently present the most viable candidates for biotechnological use.

Conclusions:

  • Thermostable alpha-CAs are promising biocatalysts for CO2 sequestration and biofuel production.
  • Protein engineering can further enhance the utility of CAs in industrial processes.
  • Further research is needed to optimize CAs for demanding biotechnological applications.