A new member of the PBAN family in Spodoptera littoralis: molecular cloning and immunovisualisation in scotophase hemolymph.
In this article, we report evidence suggesting that the immunoreactive factor previously detected in Spodoptera littoralis scotophase hemolymph is PBAN, which supports a humoral route of the hormone to the pheromone gland. Western blot after native-PAGE of prepurified scotophase hemolymph extracts yielded an immunoreactive band with the same mobility as S. littoralis Br-SOG factor and the expected mobility for a noctuid PBAN. This band was not detected in photophase hemolymph extract. The identity of S. littoralis Br-SOG factor as PBAN was obtained from cDNA cloning using RT-PCR strategy. This allowed us to deduce the amino acid sequence of Spl-PBAN, which is highly homologous to other known PBANs. Moreover, we found that the PBAN encoding cDNA also encoded four other putative amidated peptides (Spl-DH homologue, Spl-alpha-NP, Spl-beta-NP and Spl-gamma-NP) that are identical or highly conserved among noctuids, and two non amidated peptides of unknown function. This cDNA organization is common to all known cDNAs encoding PBANs, leading to the release of different peptides after putative enzymatic cleavage of the preprohormone.
Department of Biological Organic Chemistry, IIQAB, CSIC, Jordi Girona 18-26, E-08034 Barcelona, Spain.
Francesc
F
Iglesias
Pilar
P
Marco
Marie-Christine
MC
François
Francisco
F
Camps
Gemma
G
Fabriàs
Emmanuelle
E
Jacquin-Joly
D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D003001:Cloning, Molecular; D018076:DNA, Complementary / Q000235:genetics; D005260:Female; D006458:Hemolymph / Q000378:metabolism; D007150:Immunohistochemistry; D008969:Molecular Sequence Data; D009479:Neuropeptides / Q000235:genetics* / Q000378:metabolism*; D017386:Sequence Homology, Amino Acid; D012724:Sex Attractants / Q000378:metabolism; D013045:Species Specificity; D018411:Spodoptera / Q000235:genetics* / Q000378:metabolism*
D018076:DNA, Complementary; D009479:Neuropeptides; D012724:Sex Attractants; C079709:pheromone biosynthesis activating neuropeptide, Helicoverpa zea