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If you were a pharmaceutical researcher, why would you want to learn the three dimensional shapes of naturally occurring signaling molecules?

i understand that biological molecules can bind to each other forming the weak bonds and that they can mimic other molecules  but I don't see the importance In the 3D shapes 

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Sandra H. | Sandra H. A Patient, successful and effective professional.Sandra H. A Patient, successful and effe...
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J Chem Inf Model. 2013 Feb 25;53(2):327-42. doi: 10.1021/ci300445e. Epub 2013 Jan 18.
3D molecular descriptors important for clinical success.
Kombo DC1, Tallapragada K, Jain R, Chewning J, Mazurov AA, Speake JD, Hauser TA, Toler S.
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The pharmacokinetic and safety profiles of clinical drug candidates are greatly influenced by their requisite physicochemical properties. In particular, it has been shown that 2D molecular descriptors such as fraction of Sp3 carbon atoms (Fsp3) and number of stereo centers correlate with clinical success. Using the proteomic off-target hit rate of nicotinic ligands, we found that shape-based 3D descriptors such as the radius of gyration and shadow indices discriminate off-target promiscuity better than do Fsp3 and the number of stereo centers. We have deduced the relevant descriptor values required for a ligand to be nonpromiscuous. Investigating the MDL Drug Data Report (MDDR) database as compounds move from the preclinical stage toward the market, we have found that these shape-based 3D descriptors predict clinical success of compounds at preclinical and phase1 stages vs compounds withdrawn from the market better than do Fsp3 and LogD. Further, these computed 3D molecular descriptors correlate well with experimentally observed solubility, which is among well-known physicochemical properties that drive clinical success. We also found that about 84% of launched drugs satisfy either Shadow index or Fsp3 criteria, whereas withdrawn and discontinued compounds fail to meet the same criteria. Our studies suggest that spherical compounds (rather than their elongated counterparts) with a minimal number of aromatic rings may exhibit a high propensity to advance from clinical trials to market.
Grigori S. | Certified Physics and Math Teacher G.S.Certified Physics and Math Teacher G.S.

The configuration (or 3D shape of molecules) is defined by the potential energy of interaction between atoms of the molecules. This configuration shows (for example) can a particular molecule be broken down into smaller compounds or elements. In other words, defines its chemical reactivity - something that all pharmaceutical recerachers have to deal with. The balanced configuration relates to the minimum of the potential energy of the molecules. The same atoms with different configuration will (very likely) create unstable molecules.