scholarly journals Ecdysis triggering hormone ensures proper timing of juvenile hormone biosynthesis in pharate adult mosquitoes

2014 ◽  
Vol 54 ◽  
pp. 98-105 ◽  
Author(s):  
Maria Areiza ◽  
Marcela Nouzova ◽  
Crisalejandra Rivera-Perez ◽  
Fernando G. Noriega
Keyword(s):  
Juvenile Hormone ◽  
Juvenile Hormone Biosynthesis ◽  
Proper Timing ◽  
Hormone Biosynthesis ◽  
Ecdysis Triggering Hormone ◽  
Pharate Adult

scholarly journals ML-236B (Compactin) as an Inhibitor of Juvenile Hormone Biosynthesis

1983 ◽  
Vol 18 (1) ◽  
pp. 111-115 ◽  
Author(s):  
Kiyoshi HIRUMA ◽  
Shigemi YAGI ◽  
Akira ENDO
Keyword(s):  
Juvenile Hormone ◽  
Juvenile Hormone Biosynthesis ◽  
Hormone Biosynthesis

On the Specificity of Juvenile Hormone Biosynthesis in the Male Cecropia Moth

1981 ◽  
Vol 36 (7-8) ◽  
pp. 579-585 ◽  
Author(s):  
Martin G. Peter ◽  
Paul D. Shirk ◽  
Karl H. Dahm ◽  
Herbert Roller
Keyword(s):  
Juvenile Hormone ◽  
Enzyme System ◽  
Reaction Rates ◽  
Corpora Allata ◽  
Low Molecular Weight ◽  
Methyltransferase Activity ◽  
Accessory Sex Glands ◽  
Juvenile Hormone Biosynthesis ◽  
Hormone Biosynthesis ◽  
Natural Enantiomer

Abstract The accessory sex glands (ASG) of adult male Cecropia contain an enzyme that methylates juvenile hormone acids (JH-acids) in the presence of S-adenosyl-L-methionine (SAM). The methyltransferase is highly specific. The reaction rates decrease in the order JH-I-acid, JH-II-acid and JH-III-acid; in each case the natural enantiomer is esterified predominantly. Methyltrans­ ferase activity with the same substrate specificity was also demonstrated in adult female corpora allata (CA). Male CA have only marginal methyltransferase activity. The CA of male H. cecropia contain substantial amounts of JH-I-acid and JH-II-acid (minimum: 5 pmol/pair). When kept in organ culture, they release JH-acids into the medium. Radiolabeled propionate and mevalonate are incorporated efficiently into the carbon skeletons of the JH-acids. The enzyme system performing these transformations cannot be forced to produce JH-III-acid even in the presence of high mevalonate concentrations, though homomevalonate may enhance biosynthesis of JH-I-acid and JH-II-acid more than tenfold. It becomes evident that the regulation of JH titer balances with regard to the homologous structures during insect development is not merely a question of the availability of low molecular weight precursors, but in addition that of highly specific enzymes acting as regulatory entities in the later steps of the biosynthetic sequence.

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