Chemical communication in arthropods

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In both [http://en.wikipedia.org/wiki/Arthropod arthropods] and [http://en.wikipedia.org/wiki/Vertebrate vertebrates] the detection of volatiles is completed by a complicated process which is mediated by soluble as well as transmembrane proteins <ref name="pelosi">DOI: 10.3389/fphys.2014.00320</ref>.
In both [http://en.wikipedia.org/wiki/Arthropod arthropods] and [http://en.wikipedia.org/wiki/Vertebrate vertebrates] the detection of volatiles is completed by a complicated process which is mediated by soluble as well as transmembrane proteins <ref name="pelosi">DOI: 10.3389/fphys.2014.00320</ref>.
It should be mentioned that the detection of [http://en.wikipedia.org/wiki/Pheromone pheromones] is also vital to microorganisms, as it regulates gene expression in what is termed [http://en.wikipedia.org/wiki/Quorum_sensing “quorum sensing”].
It should be mentioned that the detection of [http://en.wikipedia.org/wiki/Pheromone pheromones] is also vital to microorganisms, as it regulates gene expression in what is termed [http://en.wikipedia.org/wiki/Quorum_sensing “quorum sensing”].
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In arthropods, most of what is known on chemosensory communication is based on insects' research. The process begins when a volatile (mostly a small [http://en.wikipedia.org/wiki/Hydrophobe hydrophobic] molecule) enters the chemosensilla lymph of an insect, or the mucus of a vertebrate in the nasal cavity ([[fig 1]]). Both mediums are abundant in soluble proteins which binds to the hydrophobic molecules, solubilizes and carries it to the [http://en.wikipedia.org/wiki/Chemoreceptor chemoreceptors] on the dendritic membrane of the olfactory receptor neuron <ref name="kaupp" /><ref>Vogt RG (2005) Molecular basis of pheromone detection in insects. Comprehensive Insect Physiology, Biochemistry, Pharmacology and Molecular Biology, eds Gilbert LI, Iatro K, Gills S (Elsevier, London), Vol 3, pp 753–804.</ref>.The chemical signal is there by translated into an electrical signal which can cause an immediate response, or further elaborate with other signals in the insect's mushroom bodies or vertebrate's brain ([[fig 2]])<ref>doi: 10.3389/fncel.2012.00048</ref><ref>doi: 10.1146/annurev-ento-120811-153635</ref>.
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In arthropods, most of what is known on chemosensory communication is based on insects' research. The process begins when a volatile (mostly a small [http://en.wikipedia.org/wiki/Hydrophobe hydrophobic] molecule) enters the chemosensilla lymph of an insect, or the mucus of a vertebrate in the nasal cavity ([[fig 1]]). Both mediums are abundant in soluble proteins which binds to the hydrophobic molecules, solubilizes and carries it to the [http://en.wikipedia.org/wiki/Chemoreceptor chemoreceptors] on the dendritic membrane of the olfactory receptor neuron <ref name="kaupp" /><ref name="vogt">Vogt RG (2005) Molecular basis of pheromone detection in insects. Comprehensive Insect Physiology, Biochemistry, Pharmacology and Molecular Biology, eds Gilbert LI, Iatro K, Gills S (Elsevier, London), Vol 3, pp 753–804.</ref>.The chemical signal is there by translated into an electrical signal which can cause an immediate response, or further elaborate with other signals in the insect's mushroom bodies or vertebrate's brain ([[fig 2]])<ref>doi: 10.3389/fncel.2012.00048</ref><ref>doi: 10.1146/annurev-ento-120811-153635</ref>.
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*'''Receptors'''
*'''Receptors'''
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Most of the vertebrates' chemosensory receptors are metabotropic and belong to the [[G protein-coupled receptors]]. Once the volatile binds to the receptor it initiates intracellular signal transduction <ref>doi: 10.1016/S0167-4838(00)00167-9</ref>. On the other hand, arthropods' and insects' chemoreceptors are composed of two subunits: [http://en.wikipedia.org/wiki/Olfactory_receptor Receptor] and [http://en.wikipedia.org/wiki/Co-receptor Co-receptor] that upon interaction with the volatile or the complex of volatile-soluble protein, are activated and serve as an [http://en.wikipedia.org/wiki/Ion_channel ion channel]. The opening of the ion channel changes the [http://en.wikipedia.org/wiki/Membrane_potential membrane potential], and starts the inter-cellular signal transduction<ref>Vogt RG (2005) Molecular basis of pheromone detection in insects. Comprehensive Insect Physiology, Biochemistry, Pharmacology and Molecular Biology, eds Gilbert LI, Iatro K, Gills S (Elsevier, London), Vol 3, pp 753–804.</ref>.[[Image:Chemoreceptors-insects.jpg|thumb|center|upright=2.5|Figure 4: Types of insect receptors. Figure 1 from Kaupp (2010), used with permission of Prof. U. Benjamin Kaupp.]]
+
Most of the vertebrates' chemosensory receptors are metabotropic and belong to the [[G protein-coupled receptors]]. Once the volatile binds to the receptor it initiates intracellular signal transduction <ref>doi: 10.1016/S0167-4838(00)00167-9</ref>. On the other hand, arthropods' and insects' chemoreceptors are composed of two subunits: [http://en.wikipedia.org/wiki/Olfactory_receptor Receptor] and [http://en.wikipedia.org/wiki/Co-receptor Co-receptor] that upon interaction with the volatile or the complex of volatile-soluble protein, are activated and serve as an [http://en.wikipedia.org/wiki/Ion_channel ion channel]. The opening of the ion channel changes the [http://en.wikipedia.org/wiki/Membrane_potential membrane potential], and starts the inter-cellular signal transduction<ref name="vogt" />.[[Image:Chemoreceptors-insects.jpg|thumb|center|upright=2.5|Figure 4: Types of insect receptors. Figure 1 from Kaupp (2010), used with permission of Prof. U. Benjamin Kaupp.]]
*'''Soluble proteins'''
*'''Soluble proteins'''

Revision as of 14:00, 28 January 2015

Figure 1: Vertebrate (a), and insect (b) sensilla. Figure 1 from Kaupp (2010), used with permission of Prof. U. Benjamin Kaupp.
Figure 1: Vertebrate (a), and insect (b) sensilla. Figure 1 from Kaupp (2010), used with permission of Prof. U. Benjamin Kaupp.
Figure 2.(a) Schematic representation of the general structure of an insect olfactory hair; (b) The first molecular steps of the insect chemosensory signaling transduction pathway. Figure 1 from Sánchez-Gracia et al.(2009), used with permission of Prof. Sa´nchez-Gracia.
Figure 2.(a) Schematic representation of the general structure of an insect olfactory hair; (b) The first molecular steps of the insect chemosensory signaling transduction pathway. Figure 1 from Sánchez-Gracia et al.(2009)[1], used with permission of Prof. Sa´nchez-Gracia.
Figure 3. The evolution of the Chemosensory System. Blue boxes represent the aquatic lifestyle. Right: Presence or absence of the chemosensory gene families in extant species. Branch lengths are not to scale. Figure 7 from Vieira and Rozas (2011), used with permission of Prof Julio Rozas
Figure 3. The evolution of the Chemosensory System. Blue boxes represent the aquatic lifestyle. Right: Presence or absence of the chemosensory gene families in extant species. Branch lengths are not to scale. Figure 7 from Vieira and Rozas (2011), used with permission of Prof Julio Rozas [2]

Contents

The molecular basis of chemical communication

The sense of smell, Olfaction is a primary sense in nature. It plays a significant role in behaviors which are crucial for the organism survival: food searching, host and mating selection, and avoiding predators and pathogens [3].

In both arthropods and vertebrates the detection of volatiles is completed by a complicated process which is mediated by soluble as well as transmembrane proteins [4]. It should be mentioned that the detection of pheromones is also vital to microorganisms, as it regulates gene expression in what is termed “quorum sensing”. In arthropods, most of what is known on chemosensory communication is based on insects' research. The process begins when a volatile (mostly a small hydrophobic molecule) enters the chemosensilla lymph of an insect, or the mucus of a vertebrate in the nasal cavity (fig 1). Both mediums are abundant in soluble proteins which binds to the hydrophobic molecules, solubilizes and carries it to the chemoreceptors on the dendritic membrane of the olfactory receptor neuron [3][5].The chemical signal is there by translated into an electrical signal which can cause an immediate response, or further elaborate with other signals in the insect's mushroom bodies or vertebrate's brain (fig 2)[6][7].


What is the differences and similarities between Arthropods and Vertebrates?

Though functionally similar, receptors as well as soluble proteins are structurally and genetically unrelated in insects and vertebrates (see fig 3 for the putative evolution of proteins involved in chemosensory system).

  • Receptors
Most of the vertebrates' chemosensory receptors are metabotropic and belong to the G protein-coupled receptors. Once the volatile binds to the receptor it initiates intracellular signal transduction [8]. On the other hand, arthropods' and insects' chemoreceptors are composed of two subunits: Receptor and Co-receptor that upon interaction with the volatile or the complex of volatile-soluble protein, are activated and serve as an ion channel. The opening of the ion channel changes the membrane potential, and starts the inter-cellular signal transduction[5].
Figure 4: Types of insect receptors. Figure 1 from Kaupp (2010), used with permission of Prof. U. Benjamin Kaupp.
Figure 4: Types of insect receptors. Figure 1 from Kaupp (2010), used with permission of Prof. U. Benjamin Kaupp.
  • Soluble proteins

These proteins which are concentrated in the sensillar lymph, solubilize and carry the volatile molecules to the receptor. There are two main known types of soluble proteins that are involved in arthropods' chemical communication: Odorant binding proteins –OBPs,Chemosensory protein-CSP (fig 5). Though bearing the same name and participating in the same function, OBP of vertebrates and arthropods are two distinct families with completely different structure and origin[4]. Arthropods' OBP are composed of alpha helices, while vertebrates' OBP belong to the Lipocalins super family and have a beta-barrel structure (for structure comparison, see table 1 and fig 5). Recently, another family of protein has been suggested to play a role in ant chemical communication, Niemann-Pick type C2 protein-NPC2 [9].

Figure 5. (a) An example for vertebrate's OBP-a pig OBP, PDB:1e06; (b) An example for insect's OBP- Bombyx mori PBP, PDB:1dqe; (c) An example for insect's CSP-Mamestra brassicae CSP2 PDB:1n8u
Figure 5. (a) An example for vertebrate's OBP-a pig OBP, PDB:1e06; (b) An example for insect's OBP- Bombyx mori PBP, PDB:1dqe; (c) An example for insect's CSP-Mamestra brassicae CSP2 PDB:1n8u
Table 1. Summation of the main structure properties of soluble proteins types
Table 1. Summation of the main structure properties of soluble proteins types

Types of Soluble proteins in arthropods

PDB ID 1OOH

Drag the structure with the mouse to rotate

See also

References

  1. ↑ Sanchez-Gracia A, Vieira FG, Rozas J. Molecular evolution of the major chemosensory gene families in insects. Heredity (Edinb). 2009 Sep;103(3):208-16. doi: 10.1038/hdy.2009.55. Epub 2009 May, 13. PMID:19436326 doi:http://dx.doi.org/10.1038/hdy.2009.55
  2. ↑ Vieira FG, Rozas J. Comparative genomics of the odorant-binding and chemosensory protein gene families across the Arthropoda: origin and evolutionary history of the chemosensory system. Genome Biol Evol. 2011;3:476-90. doi: 10.1093/gbe/evr033. Epub 2011 Apr 28. PMID:21527792 doi:http://dx.doi.org/10.1093/gbe/evr033
  3. ↑ 3.0 3.1 Kaupp UB. Olfactory signalling in vertebrates and insects: differences and commonalities. Nat Rev Neurosci. 2010 Mar;11(3):188-200. doi: 10.1038/nrn2789. Epub 2010 Feb 10. PMID:20145624 doi:http://dx.doi.org/10.1038/nrn2789
  4. ↑ 4.0 4.1 Pelosi P, Iovinella I, Felicioli A, Dani FR. Soluble proteins of chemical communication: an overview across arthropods. Front Physiol. 2014 Aug 27;5:320. doi: 10.3389/fphys.2014.00320. eCollection, 2014. PMID:25221516 doi:http://dx.doi.org/10.3389/fphys.2014.00320
  5. ↑ 5.0 5.1 Vogt RG (2005) Molecular basis of pheromone detection in insects. Comprehensive Insect Physiology, Biochemistry, Pharmacology and Molecular Biology, eds Gilbert LI, Iatro K, Gills S (Elsevier, London), Vol 3, pp 753–804.
  6. ↑ Wicher D. Functional and evolutionary aspects of chemoreceptors. Front Cell Neurosci. 2012 Oct 26;6:48. doi: 10.3389/fncel.2012.00048. eCollection, 2012. PMID:23112762 doi:http://dx.doi.org/10.3389/fncel.2012.00048
  7. ↑ Leal WS. Odorant reception in insects: roles of receptors, binding proteins, and degrading enzymes. Annu Rev Entomol. 2013;58:373-91. doi: 10.1146/annurev-ento-120811-153635. Epub, 2012 Sep 27. PMID:23020622 doi:http://dx.doi.org/10.1146/annurev-ento-120811-153635
  8. ↑ doi: https://dx.doi.org/10.1016/S0167-4838(00)00167-9
  9. ↑ 9.0 9.1 Ishida Y, Tsuchiya W, Fujii T, Fujimoto Z, Miyazawa M, Ishibashi J, Matsuyama S, Ishikawa Y, Yamazaki T. Niemann-Pick type C2 protein mediating chemical communication in the worker ant. Proc Natl Acad Sci U S A. 2014 Mar 11;111(10):3847-52. doi:, 10.1073/pnas.1323928111. Epub 2014 Feb 24. PMID:24567405 doi:http://dx.doi.org/10.1073/pnas.1323928111
  10. ↑ Ha TS, Smith DP. A pheromone receptor mediates 11-cis-vaccenyl acetate-induced responses in Drosophila. J Neurosci. 2006 Aug 23;26(34):8727-33. PMID:16928861 doi:10.1523/JNEUROSCI.0876-06.2006
  11. ↑ doi: https://dx.doi.org/m10.1016/j.cell.2008.04.046
  12. ↑ Campanacci V, Lartigue A, Hallberg BM, Jones TA, Giudici-Orticoni MT, Tegoni M, Cambillau C. Moth chemosensory protein exhibits drastic conformational changes and cooperativity on ligand binding. Proc Natl Acad Sci U S A. 2003 Apr 29;100(9):5069-74. Epub 2003 Apr 15. PMID:12697900 doi:10.1073/pnas.0836654100
  13. ↑ Vanier MT, Millat G. Structure and function of the NPC2 protein. Biochim Biophys Acta. 2004 Oct 11;1685(1-3):14-21. PMID:15465422 doi:http://dx.doi.org/10.1016/j.bbalip.2004.08.007
  14. ↑ doi: https://dx.doi.org/10.1074/jbc.M703848200.STRUCTURAL
  15. ↑ Fuqua C, Parsek MR, Greenberg EP. Regulation of gene expression by cell-to-cell communication: acyl-homoserine lactone quorum sensing. Annu Rev Genet. 2001;35:439-68. PMID:11700290 doi:http://dx.doi.org/10.1146/annurev.genet.35.102401.090913

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