Chemical Modification
Chemical Modification - Related Videos
11:41
Crystallization of Salicylic Acid via Chemical Modification
0 Views •
2023
Source: Kerry M. Dooley and Michael G. Benton, Department of Chemical Engineering, Louisiana State University, Baton Rouge, LA Processing of biochemicals involves unit operations such as crystallization, ultracentrifugation, membrane filtration, and preparative chromatography, all of which have in common the need to separate large from small molecules, or solid from liquid. Of these, crystallization is the most important from a tonnage standpoint. For that reason, it is commonly employed in the...
02:32
Histone Modification
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2020
The histone proteins have a flexible N-terminal tail extending out from the nucleosome. These histone tails are often subjected to post-translational modifications such as acetylation, methylation, phosphorylation, and ubiquitination. Particular combinations of these modifications form “histone codes” that influence the chromatin folding and tissue-specific gene expression. Acetylation The enzyme histone acetyltransferase adds acetyl group to the histones. Another enzyme, histone deacetylase,...
02:25
Spreading of Chromatin Modifications
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2020
The histone proteins in the nucleosomes are post-translationally modified (PTM) to increase or decrease access to DNA. The commonly observed PTMs are methylation, acetylation, phosphorylation, and ubiquitination of lysine amino acids in the histone H3 tail region. These histone modifications have specific meaning for the cell. Hence, they are called "histone code". The protein complex involved in histone modification is termed as "reader-writer" complex. Writers The writer is an enzyme that can...
14:22
Free Radicals in Chemical Biology: from Chemical Behavior to Biomarker Development
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Cited by 9 •
2013
Radical-based biomimetic chemistry has been applied to building-up libraries necessary for biomarker development.
07:08
Detection of Histone Modifications in Plant Leaves
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Cited by 22 •
2011
A reliable and useful approach to detect histone modifications on specific plant genes is described. The approach combines chromatin immunoprecipitation (ChIP) and real-time quantitative PCR. It allows detection of histone modifications on specific genes with a role in diverse physiological processes.
FAQs
Deliberate changes to functional groups, bond arrangements, or substituents can alter how a molecule behaves in biological systems. In pharmacology, these structural differences may affect potency, selectivity, solubility, stability, transport, or overall biological activity. Comparing related molecules helps connect a specific structural feature with a measurable pharmacological effect rather than treating the molecule as an indivisible unit.
Structure–activity relationships, or SAR, show how molecular structure relates to pharmacological effects. Researchers compare chemical analogs with related structures and examine changes in activity, potency, or selectivity. This information identifies structural features that improve a candidate and supports systematic optimization, helping guide further chemical modification instead of relying only on trial-and-error compound design.
Structural changes can influence a candidate’s absorption, distribution, metabolism, and excretion by altering properties such as solubility, stability, and transport. These effects determine how the compound behaves before reaching or leaving its target site. Considering ADME alongside biological activity helps researchers balance therapeutic performance with the candidate’s movement and persistence in the body.
Drug analogs provide structurally related compounds for comparing activity and identifying useful molecular features. Prodrugs represent another application of chemical modification in which a candidate’s altered structure can be evaluated as part of development. Together, these approaches expand the range of compounds researchers can assess while seeking improved potency, selectivity, stability, solubility, or safety.
A typical workflow begins with selecting a candidate structure and choosing functional groups, bond arrangements, or substituents for alteration. Researchers then compare the resulting analogs for biological activity and properties such as potency, selectivity, solubility, stability, and transport. The observed structure–activity relationships guide subsequent modifications and help identify more effective candidate compounds.
Chemical modification can support improvement in several pharmacological outcomes, including potency, selectivity, solubility, stability, safety, and target transport. It can also clarify how structural features influence absorption, distribution, metabolism, and excretion. These applications make the approach useful for developing therapeutic agents while simultaneously improving understanding of the relationship between molecular structure and pharmacological effects.