skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Implausibility of the vibrational theory of olfaction

Journal Article · · Proceedings of the National Academy of Sciences of the United States of America
 [1];  [2];  [3];  [4];  [5];  [1];  [1];  [6];  [6];  [6];  [1];  [5];  [6];  [1];  [5];  [7]
  1. Univ. at Albany, State Univ. of New York, Albany, NY (United States)
  2. Yale Univ., New Haven, CT (United States); Brookhaven National Lab. (BNL), Upton, NY (United States)
  3. City Univ. of New York, Flushing, NY (United States)
  4. Duke Univ. Medical Center, Durham, NC (United States)
  5. Yale Univ., New Haven, CT (United States)
  6. Shanghai Jiaotong Univ. School of Medicine, Shanghai (China)
  7. Shanghai Jiaotong Univ. School of Medicine, Shanghai (China); Shanghai Jiao tong Univ. School of Medicine/Shanghai Institutes for Biological Sciences of Chinese Academy of Sciences, Shanghai (China)

The vibrational theory of olfaction assumes that electron transfer occurs across odorants at the active sites of odorant receptors (ORs), serving as a sensitive measure of odorant vibrational frequencies, ultimately leading to olfactory perception. A previous study reported that human subjects differentiated hydrogen/deuterium isotopomers (isomers with isotopic atoms) of the musk compound cyclopentadecanone as evidence supporting the theory. Here, we find no evidence for such differentiation at the molecular level. In fact, we find that the human musk-recognizing receptor, OR5AN1, identified using a heterologous OR expression system and robustly responding to cyclopentadecanone and muscone, fails to distinguish isotopomers of these compounds in vitro. Furthermore, the mouse (methylthio)methanethiol (MTMT)-recognizing receptor, MOR244-3, and other selected human and mouse ORs, responded similarly to normal, deuterated, and ¹³C isotopomers of their respective ligands, paralleling our results with the musk receptor OR5AN1. These findings suggest that the proposed vibration theory does not apply to the human musk receptor OR5AN1, mouse thiol receptor MOR244-3, or other ORs examined. Also, contrary to the vibration theory predictions, muscone-d₃₀ lacks the 1,380-1,550 cm⁻¹ IR bands claimed to be essential for musk odor. Furthermore, our theoretical analysis shows that the proposed electron transfer mechanism of the vibrational frequencies of odorants could be easily suppressed by quantum effects of non-odorant molecular vibrational modes. As a result, these and other concerns about electron transfer at ORs, together with our extensive experimental data, argue against the plausibility of the vibration theory.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC00112704
OSTI ID:
1213361
Report Number(s):
BNL-108186-2015-JA
Journal Information:
Proceedings of the National Academy of Sciences of the United States of America, Vol. 112, Issue 21; ISSN 0027-8424
Publisher:
National Academy of Sciences, Washington, DC (United States)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 75 works
Citation information provided by
Web of Science

References (81)

Olfactory discrimination ability of CD-1 mice for a large array of enantiomers journal January 2007
Physicochemical vs. Vibrational Descriptors for Prediction of Odor Receptor Responses journal October 2013
Temperature dependent activation energy for electron transfer between biological molecules journal June 1976
Molecular Vibration-Sensing Component in Human Olfaction journal January 2013
A Large-Scale Analysis of Odor Coding in the Olfactory Epithelium journal June 2011
Enzymatic Conversion of Odorants in Nasal Mucus Affects Olfactory Glomerular Activation Patterns and Odor Perception journal December 2010
Unraveling the Sense of Smell (Nobel Lecture) journal December 2005
Scents and Sensibility: A Molecular Logic of Olfactory Perception (Nobel Lecture) journal December 2005
Quantum origins of molecular recognition and olfaction in drosophila journal December 2012
Anosmia; or, Cases Illustrating the Physiology and Pathology of the Sense of Smell journal January 1870
Olfaction is a chemical sense, not a spectral sense journal July 2011
Odour and Molecular Vibration journal February 1966
Inelastic tunneling in long-distance biological electron transfer reactions journal September 1997
Odor Coding by a Mammalian Receptor Repertoire journal March 2009
Dependence of single-molecule junction conductance on molecular conformation journal August 2006
Electron transfer in proteins journal January 1995
Odorant–Receptor Interactions and Odor Percept: A Chemical Perspective journal June 2008
Unraveling the Sense of Smell (Nobel Lecture) journal September 2005
Closed-Form Expressions of Quantum Electron Transfer Rate Based on the Stationary-Phase Approximation journal September 2006
A psychophysical test of the vibration theory of olfaction journal March 2004
Investigation of odors in the fragrance industry journal December 2009
Odor coding by a mammalian receptor repertoire journal January 2009
The Nature of the Intermolecular Forces Operative in Biological Processes journal July 1940
RTP Family Members Induce Functional Expression of Mammalian Odorant Receptors journal November 2004
The scientific basis of odour journal July 1938
A Mass Transport Model of Olfaction journal March 1994
Temporal processing of olfactory stimuli during retronasal perception journal June 2009
Molecular vibration-sensing component in Drosophila melanogaster olfaction journal February 2011
The molecular basis for scent discrimination: Response to nitrobenzene-d5 of honey bees (Apis mellifera L.) conditioned with nitrobenzene journal April 1973
QM/MM Model of the Mouse Olfactory Receptor MOR244-3 Validated by Site-Directed Mutagenesis Experiments journal September 2014
Binding isotope effects: boon and bane journal October 2007
The effect of intramolecular quantum modes on free energy relationships for electron transfer reactions journal November 1975
Aldol Reactions of Formaldehyde in Non-aqueous Media. IV. The Mechanism of the Acid-catalyzed Reaction of 2-Butanone with Formaldehyde. journal January 1968
In Vivo Identification of Eugenol-Responsive and Muscone-Responsive Mouse Odorant Receptors journal November 2014
Odor and molecular vibration: Neural coding of olfactory information journal February 1977
Crucial role of copper in detection of metal-coordinating odorants journal February 2012
On the Theory of Electron‐Transfer Reactions. VI. Unified Treatment for Homogeneous and Electrode Reactions journal July 1965
Olfaction: the physics of how smell works? journal September 2011
Science is perception: what can our sense of smell tell us about ourselves and the world around us? journal August 2010
The Mouse Eugenol Odorant Receptor: Structural and Functional Plasticity of a Broadly Tuned Odorant Binding Pocket journal February 2011
Olfactory Discrimination Ability of Asian Elephants (Elephas maximus) for Structurally Related Odorants journal December 2012
Electron Transfer in Proteins journal June 1996
Deuteration of the melon fly attractant, cue-lure, and its effect on olfactory response and infra-red absorption journal December 1968
Genetic Elucidation of Human Hyperosmia to Isovaleric Acid journal October 2007
Deuterium isotope effects on noncovalent interactions between molecules journal February 1999
The Potential of Isotopomers as a Test for the Vibrational Theory of Olfactory Sense Recognition journal January 2013
Primary charge separation in mutant reaction centers of Rhodobacter capsulatus journal December 1993
Kinetics and Mechanism of the Oxidation of Substituted Benzaldehydes by Benzyltrimethylammonium Chlorobromate journal June 2000
Nature of biological electron transfer journal February 1992
Odorant Metabolism Catalyzed by Olfactory Mucosal Enzymes Influences Peripheral Olfactory Responses in Rats journal March 2013
A structure–odour relationship study using EVA descriptors and hierarchical clustering journal January 2004
A Spectroscopic Mechanism for Primary Olfactory Reception journal January 1996
Long-Range Electron Tunneling journal February 2014
Genetic variation in a human odorant receptor alters odour perception journal September 2007
Quantum Origins of Molecular Recognition and Olfaction in Drosophila text January 2012
Investigation of vibrational theory of olfaction with variously labelled benzaldehydes journal April 2001
Reply to Hettinger: Olfaction is a physical and a chemical sense in Drosophila journal July 2011
Dynamics of the dissipative two-state system journal January 1987
Spatial coding of enantiomers in the rat olfactory bulb journal April 2001
Odour and Molecular Vibration journal June 1961
Deuterium Isotope Effects on Hydrophobic Interactions:  The Importance of Dispersion Interactions in the Hydrophobic Phase journal November 2003
Vibrationally assisted electron transfer mechanism of olfaction: myth or reality? journal January 2012
Alarm pheromones: Utilization in evaluation of olfactory theories journal December 1971
Deuterium Isotope Effects on Drug Pharmacokinetics. I. System-Dependent Effects of Specific Deuteration with Aldehyde Oxidase Cleared Drugs journal December 2011
Evidence for a Chromatographic Model of Olfaction journal July 1970
Olfactory Receptor and Neural Pathway Responsible for Highly Selective Sensing of Musk Odors journal January 2014
Could Humans Recognize Odor by Phonon Assisted Tunneling? journal January 2007
Mild and Efficient H/D Exchange of Alkanes Based on CH Activation Catalyzed by Rhodium on Charcoal journal July 2008
Evaluating cell-surface expression and measuring activation of mammalian odorant receptors in heterologous cells journal August 2008
The Swipe Card Model of Odorant Recognition journal November 2012
Mechanism of Oxidation of Benzaldehyde by Polypyridyl Oxo Complexes of Ru(IV) journal May 2005
Scents and Sensibility: A Molecular Logic of Olfactory Perception (Nobel Lecture) journal September 2005
Selective oxidation of allylic alcohols with chromic acid journal May 1975
The Emperor's new theory journal April 2003
Odorant Receptor Map in the Mouse Olfactory Bulb: In Vivo Sensitivity and Specificity of Receptor-Defined Glomeruli journal December 2006
Mild and Efficient H/D Exchange of Alkanes Based on CH Activation Catalyzed by Rhodium on Charcoal journal July 2008
Theory of torsional non-Condon electron transfer: A generalized spin-boson Hamiltonian and its nonadiabatic limit solution journal January 2005
Dependence of Single Molecule Junction Conductance on Molecular Conformation text January 2006
Protein Dynamics Control the Kinetics of Initial Electron Transfer in Photosynthesis journal May 2007
Honeybees ( Apis mellifera ) learn to discriminate the smell of organic compounds from their respective deuterated isotopomers journal March 2014
100 Years of Baeyer–Villiger Oxidations journal April 1999

Cited By (25)

Laying a controversial smell theory to rest journal May 2015
Differential Expression of Mucins in Murine Olfactory Versus Respiratory Epithelium posted_content April 2019
Exploring the Mechanism of Olfactory Recognition at the Initial Stage by Modeling the Emission Spectrum of Electron Transfer posted_content May 2019
Carbon chain shape selectivity by the mouse olfactory receptor OR-I7 journal January 2018
Molecular recognition in olfaction journal May 2017
Differential Expression of Mucins in Murine Olfactory Versus Respiratory Epithelium journal July 2019
Is It Possible to Predict the Odor of a Molecule on the Basis of its Structure? journal June 2019
A Quantum Biomimetic Electronic Nose Sensor journal January 2018
Vibrational Signatures of Chirality Recognition Between α‐Pinene and Alcohols for Theory Benchmarking journal June 2019
An explicit electron-vibron model for olfactory inelastic electron transfer spectroscopy journal April 2019
Quantum effects in biology: golden rule in enzymes, olfaction, photosynthesis and magnetodetection journal May 2017
Unravelling the Olfactory Sense: From the Gene to Odor Perception journal December 2015
Molecular mechanism of activation of human musk receptors OR5AN1 and OR1A1 by ( R )-muscone and diverse other musk-smelling compounds journal April 2018
Differential Electrophysiological Responses to Odorant Isotopologues in Drosophilid Antennae journal May 2016
Odorant receptors of Drosophila are sensitive to the molecular volume of odorants journal April 2016
Neural map formation and sensory coding in the vomeronasal system journal September 2015
Fifty-five years of smelling sulfur journal April 2019
Smelling matter journal February 2016
Modular structure of human olfactory receptor codes reflects the bases of odor perception posted_content June 2019
Gated electron transport in rhodopsin and its relevance to GPCR activation posted_content May 2019
The role of metals in mammalian olfaction of low molecular weight organosulfur compounds journal January 2017
How Far Does a Receptor Influence Vibrational Properties of an Odorant? journal March 2016
Vibrational Signatures of Chirality Recognition Between α‐Pinene and Alcohols for Theory Benchmarking journal May 2019
Exploring the mechanism of olfactory recognition in the initial stage by modeling the emission spectrum of electron transfer journal January 2020
Receptor-transporting protein (RTP) family members play divergent roles in the functional expression of odorant receptors journal June 2017

Similar Records

Molecular mechanism of activation of human musk receptors OR5AN1 and OR1A1 by (R)-muscone and diverse other musk-smelling compounds
Journal Article · Mon Apr 09 00:00:00 EDT 2018 · Proceedings of the National Academy of Sciences of the United States of America · OSTI ID:1213361

The role of metals in mammalian olfaction of low molecular weight organosulfur compounds
Journal Article · Sun Jan 01 00:00:00 EST 2017 · Natural Product Reports · OSTI ID:1213361

Acute metal toxicology of olfaction in coho salmon: behavior, receptors, and odor-metal complexation
Journal Article · Tue Apr 01 00:00:00 EST 1986 · Bull. Environ. Contam. Toxicol.; (United States) · OSTI ID:1213361