Isosterism and Bioisosterism – Download as PDF File .pdf), Text File .txt) or read online. Pharmacology. Download Citation on ResearchGate | Isosterism and bioisosterism in drug design | In every scientific undertaking that is to break new ground, one has to have a. Aug 1, Isosterism and bioisosterism in drug design. By Alfred Burger. University of Virginia, Department of Chemistry,. Charlottesville, Virgina

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Wiley-VCH,p. Optimization of Lead -Identification of the active part. Bioisosterism allows modification of physicochemical parameters: Silafluofen is an organosilicon analogue of pyrethroid insecticidewherein a carbon center has been replaced by isosteric silicon. The OH group is replaced by other group having ability to undergo Biisosterism.


Drug act as a Antihistamine. Retrieved 15 Jan Bioisosteres of some patented iwosterism can be discovered automatically and used to circumvent Markush structure patent claims.

In medicinal chemistrybioisosteres are chemical substituents or groups with similar physical or chemical properties which produce broadly similar biological properties to another chemical compound. Replacement of Methyl by Chlorine: Pharmacokinetics lipophilicity, hydrophilicity, p K aH-bonding are important In order to view it, please contact the author of the presentation.

Method of Lead discovery. Hydroxy group- -OH d. Lead discovery- Random Screening. Retrieved from ” https: For fine tune of biological activity in order to- -Minimize toxicity -Modify the activity -Alter metabolism -Maximize bioavailability 7. All lily of the valley flower Why Lead Modification is Necessary?: Bioisosteres for polar group: WordPress Embed Customize Embed.

By modifying certain substituents, the pharmacological activity of the chalcone and its toxicity are also modified. In drug design[1] the purpose of exchanging one bioisostere for another is to enhance the desired biological or physical properties of a compound without making significant changes in chemical structure.


The lead is prototype compound that has the desired biological or pharmacological activity but may have many undesirable characterisics,like high toxicity, other biological activity, insolubility or metabolism problems. The presentation is successfully added In Your Favorites. From Wikipedia, the free encyclopedia.

Isosteric Replacement of Isostrrism for C: Bioisostere increase target interaction and selectivity: Tetrazole anaion is 10 times more lipophilic than a carboxylic acid and drug absorption is enhanced as a result 23 Carboxylic acid 5-Substiuted tetrazole H- acidic isostreism Bioisostere to increase absorption: All lily of the valley flower 13 Why Bioisosterism?

Application of Bioisosterism in Drug design. Drug act as a Antihistamine PowerPoint Presentation: Classical bioisosterism was originally formulated by James Moir and refined by Irving Langmuir [2] as a response to the isosterrism that different atoms with the same valence electron structure had similar biological properties.

However, with a blocked pathway for metabolism, the drug candidate may have a longer half-life.

Alpha tocopherol —reduce cardiac damage due to myocardial infraction. Whereas classical bioisosteres commonly conserve much of the same structural properties, nonclassical bioisosteres are much more dependent on the specific binding needs of the ligand in question and may substitute a linear functional group for a cyclic moiety, an alkyl group for a complex heteroatom moiety, or other changes that go far beyond a simple atom-for-atom switch. Another example is aromatic rings, a phenyl -C 6 H 5 ring can often be replaced by a different aromatic ring such as thiophene or naphthalene which may improve efficacy, change specificity isotserism binding, or reduce metabolically labile sites on the molecule, resulting in better pharmacokinetic properties.


Automatically changes to Flash or non-Flash embed. For example, the replacement of a hydrogen atom with a fluorine atom at a site of metabolic oxidation in a drug candidate may prevent such metabolism from taking place. The main use of this term and its techniques are related to pharmaceutical sciences. Trivalent atom and groups. You do not have the permission to view this presentation. Because the fluorine atom is similar in size to the hydrogen atom the overall topology of the molecule is not significantly affected, leaving the desired biological activity unaffected.

Drug Discovery, Design and Development: Amrutkar Department of Pharmaceutical Chemistry M.

Bioisostere – Wikipedia

Introduction to Lead compound. By using this site, you agree to the Terms of Use ososterism Privacy Policy. Promising Starting Points for Drug Design”.

Hence alkylsulphonamido derivative of phenylepherine was found to retain activity. Bioisosterism is used to reduce toxicity, change bioavailabilityor modify the activity of the lead compound, and may alter the metabolism of the lead. 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.


Bioisosteres in Medicinal Chemistry. Conclusion References 2 PowerPoint Presentation: Views Read Bioisosteriem View history. To overcome this problem, replacement of carboxylic acid with bioisostere which has similar physicochemical properties. Isosreric replacement involving cylic vs noncylic analog: