Lipinski's Rule of Five 826713 225664859 2008-07-14T20:17:23Z 72.72.7.3 /* The rule */ '''Lipinski's Rule of Five<ref>Lipinski CA,Lombardo F,Dominy BW and Feeney PJ.Experimental and computational approaches to estimate solubility and permeability in drug discovery and development settings.Adv Drug Del Rev,1997,23:3-25.</ref>''' is a [[rule of thumb]] to evaluate [[druglikeness]], or determine if a [[chemical compound]] with a certain [[pharmacology|pharmacological]] or [[biological activity]] has properties that would make it a likely [[oral activity|orally active]] [[drug]] in humans. The rule was formulated by [[Christopher A. Lipinski]] in 1997, based on the observation that most [[medication]] drugs are relatively small and [[lipophilicity|lipophilic]] [[molecule]]s.<ref>C. A. Lipinski, F. Lombardo, B. W. Dominy, P. J. Feeney, ''Experimental and computational approaches to estimate solubility and permeability in drug discovery and development settings'', Adv. Drug Del. Rev., '''2001''', ''46'', 3-26. ({{DOI|10.1016/S0169-409X(00)00129-0}})</ref> The rule describes [[molecular property|molecular properties]] important for a drug's [[pharmacokinetics]] in the human body, including their [[absorption (pharmacokinetics)|absorption]], [[distribution (pharmacology)|distribution]], [[metabolism]], and [[excretion]] ("[[ADME]]"). However, the rule does not predict if a compound is pharmacologically active. The rule is important for [[drug development]] where a pharmacologically active [[Drug discovery hit to lead|lead structure]] is optimized step-wise for increased activity and selectivity, as well as drug-like properties as described by Lipinski's rule. The modification of the molecular structure often leads to drugs with higher molecular weight, more rings, more rotatable [[chemical bond|bonds]], and a higher lipophilicity.<ref>T. I. Oprea, A. M. Davis, S. J. Teague, P. D. Leeson, ''Is There a Difference between Leads and Drugs? A Historical Perspective'', J. Chem. Inf. Comput. Sci., '''2001''', ''41'', 1308-1315.</ref> == The rule == Lipinski's Rule of Five states that, in general, an orally active drug has no more than one violation of the following criteria: * Not more than 5 [[hydrogen bond]] donors ([[nitrogen]] or [[oxygen]] [[atoms]] with one or more [[hydrogen]] [[atoms]]) * Not more than 10 [[hydrogen bond]] acceptors ([[nitrogen]] or [[oxygen]] [[atoms]]) * A [[molecular weight]] under 500 g/mol * A [[partition coefficient]] log ''P'' less than 5 Note that all numbers are multiples of five, which is the origin of the rule's name. == Improvements == To evaluate [[druglikeness]] better, the rules have spawned many extensions, for example one from a 1999 paper by Ghose et al.:<ref>Arup K. Ghose, Vellarkad N. Viswanadhan, and John J. Wendoloski, ''A Knowledge-Based Approach in Designing Combinatorial or Medicinal Chemistry Libraries for Drug Discovery'', J. Combin. Chem., '''1999''', ''1'', 55-68. ({{DOI|10.1021/cc9800071}})</ref> * Partition coefficient log ''P'' in -0.4 to +5.6 range * [[Molar refractivity]] from 40 to 130 * Molecular weight from 160 to 480 * Number of heavy atoms from 20 to 70 Over the past decade Lipinski's profiling tool for [[druglikeness]] has led to further investigations by scientists to extend profiling tools to lead-like properties of compounds in the hope that a better starting point in early discovery can save time and cost. == See also == * [[QSAR]], quantitative structure-activity relationship * [[Polar surface area]] * [[Biopharmaceutics Classification System]] * [[Chemical property]] * [[Molecular property]] * [[Physical property]] * [[Chemical structure]] == References == {{reflist}} == External links == * [http://www.molinspiration.com/cgi-bin/properties Interactive Rule of Five calculator] * [http://www.chemaxon.com/demosite/marvin/index.html Free online calculations of Hydrogen bond donor/acceptor, mass and logP] using ChemAxon's Marvin and Calculator Plugins - requires Java [[Category:Medicinal chemistry]] [[Category:Pharmacology]] [[Category:Cheminformatics]] [[Category:Drug discovery]] [[ca:Regla del Cinc de Lipinski]] [[de:Rule of Five]] [[ja:リピンスキーの法則]] [[zh:里宾斯基五规则]] [[it:Regola di Lipinski]]