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Mechanisms of Olfaction in Insects - ResearchSpace@Auckland ...

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Identification <strong>of</strong> putative odorant receptors from Epiphyas postvittana 104<br />

Table 4.6 summarises the properties <strong>of</strong> the E. postvittana ORs, with the predicted<br />

cod<strong>in</strong>g region length available for each OR, its closest B. mori homologue based on<br />

pairwise distance matrix calculated <strong>in</strong> ClustalX and the method(s) that identified each<br />

OR. TMPRED was used for predict<strong>in</strong>g the topology <strong>of</strong> the ORs for which more than<br />

350 am<strong>in</strong>o acids <strong>of</strong> the predicted cod<strong>in</strong>g regions were available. Of these, EpOR2, 32,<br />

34 and 47 were predicted to have <strong>in</strong>tracellular N-term<strong>in</strong>us (shaded <strong>in</strong> orange and<br />

purple on Figure 4.4). EpOR1 and EpOR6 share the most am<strong>in</strong>o acid identity with<br />

BmOR1, a PR <strong>of</strong> B. mori. EpOR1 has been demonstrated to be a receptor for plant<br />

volatiles <strong>in</strong> Chapter 2; hence EpOR6 (shaded <strong>in</strong> yellow on Figure 4.4) is predicted to<br />

be a candidate PR <strong>of</strong> E. postvittana.<br />

Table 4.6: E. postvittana putative OR repertoire to date. The ORs were identified<br />

either by Sanger sequenc<strong>in</strong>g (S), 454 transcriptome sequenc<strong>in</strong>g (T) or low coverage<br />

whole genome sequenc<strong>in</strong>g (G). The B. mori homologues <strong>of</strong> the correspond<strong>in</strong>g E.<br />

postvittana ORs are given, together with the percentage am<strong>in</strong>o acid identity shared<br />

between the homologues. This data is based on the <strong>in</strong>complete sequences <strong>of</strong> the<br />

putative E. postvittana ORs and can change as the full length sequences become<br />

available.<br />

Putative<br />

OR<br />

Length<br />

(am<strong>in</strong>o<br />

acids)<br />

Closest B. mori OR<br />

identified with the<br />

available length<br />

% am<strong>in</strong>o acid identity with<br />

B. mori ORs with the<br />

current sequence length<br />

Method<br />

EpOR1* 415 BmOR1 38 S, T, G<br />

EpOR2* 474 BmOR2 88 S, T, G<br />

EpOR3* 410 BmOR49J 65 S, T, G<br />

EpOR4 268 BmOR56 60 G<br />

EpOR5 304 BmOR68 22 G<br />

EpOR6 241 BmOR1 17 T, G<br />

EpOR7 308 BmOR4 26 T, G<br />

EpOR8 324 BmOR8 71 G<br />

EpOR9 225 BmOR4 14 G<br />

EpOR10 349 BmOR27 22 G<br />

EpOR11 113 BmOR26 19 G<br />

EpOR12 293 BmOR15 45 G<br />

EpOR13 271 BmOR13 52 T, G<br />

EpOR14 118 BmOR14 20 T, G<br />

EpOR15 319 BmOR13 20 T, G<br />

EpOR16 206 BmOR41 23 G<br />

EpOR17 243 BmOR49 60 G

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