What do you mean by Bioisostere?
From Wikipedia, the free encyclopedia. In medicinal chemistry, bioisosteres are chemical substituents or groups with similar physical or chemical properties which produce broadly similar biological properties to another chemical compound.
What are the types of Bioisostere?
Bioisosteres are classified into the following two types: Classical bioisosteres. Nonclassical bioisosteres.
What is Bioisomerism?
Bioisosterism is a strategy of Medicinal Chemistry for the rational design of new drugs, applied with a lead compound (LC) as a special process of molecular modification [1].
What is bioisosterism explain with example?
Bioisosteres are atoms or group of molecules that fit the broadest definition for isosteres. They. have chemical and physical similarities thus producing broadly similar biological properties. Many heterocycles, when appropriately substituted exhibits bioisosterism.
What is the difference between Isoelectronic and Isosteres?
The key difference between isoelectronic and isosteres is that isoelectronic chemical species have similar electronic configurations whereas isosteres are chemical species having similar size, the same number of atoms and valence electrons.
Why is fluorine considered an Bioisostere of hydrogen?
Bioisosteres For instance, fluorine is approximately 20% larger than hydrogen, and the length of a C–F bond is slightly larger than that of a C=O. bond. Unlike the other members of the halogen family, fluorine does not engage in strong halogen bonding interactions and is considered to be nonpolarizable.
How do you increase lipophilicity of a drug?
First-Pass Metabolism Considerations in Pharmaceutical Product Development
- Prodrugs are used to increase lipophilicity so that the drugs are available for oral administration, ocular, or topical drug delivery.
- The acyl ester of ganciclovir (Fig.
- Lipophilic prodrugs are also used to enhance ocular absorption.
What is the difference between Isosteres and Bioisosteres?
Classical Isosteres are molecules or ions with similar shape and often electronic properties. Many definitions are available. but the term is usually employed in the context of bioactivity and drug development. Such biologically-active compounds containing an isostere is called a bioisostere.
What is language concept of bioisosterism?
Wiktionary. bioisosterismnoun. The relationship between bioisosteres, substituents or groups with similar physical or chemical properties that impart similar biological properties to a chemical compound.
How does pKa affect drug?
The pKa of a drug is the hydrogen ion concentration (pH) at which 50% of the drug exists in its ionized hydrophilic form (i.e., in equilibrium with its un-ionized lipophilic form). All local anesthetic agents are weak bases. At physiologic pH, the lower the pKa the greater the lipophilicity.
Are all Isosters are isoelectronic?
All Isosters are isoelectronic but all isoelectronic species are not Isosters .
Are all isoelectronic Isosteres?
No, Isoelectronic species are not Isosteres as in isoelectronic species only electronic configuration is same while in Isosteres size is similar, number of atom in molecule and ion along with number of electrons are same.
What is bioisostere in pharmacology?
Bioisostere. In medicinal chemistry, bioisosteres are chemical substituents or groups with similar physical or chemical properties which produce broadly similar biological properties to another chemical compound. In drug design, the purpose of exchanging one bioisostere for another is to enhance the desired biological or physical properties…
What are non-classical bioisosteres?
Non-classical bioisosteres may differ in a multitude of ways from classical bioisosteres, but retain the focus on providing similar sterics and electronic profile to the original functional group.
What is the swissbioisostere database?
One of the applications of the SwissBioisostere database is to identify sets of pairs in which a particular substituent has been changed many times and the potency has only changed by less than 0.5 log units in any direction. This is the origin of its name and is one of the applications to which the tool can be put.
What is the objective of bioisosteric replacement?
The objective of a bioisosteric replacement is to create a new molecule with similar biological properties to the parent compound. The bioisosteric replacement may be physicochemically or topologically based.
