Regulation of the Juvenile Hormone Titer

Kort, C.A.D. de; Granger, Noelle A.

doi:10.1146/annurev.en.26.010181.000245

Cited by 185 publications

(48 citation statements)

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“…Indeed, in larval instars of Manduca sexta JH-I and JH-II have been shown to be the principal juvenile hormones (Peter et al, 1976;Schooley et al, 1976). A low molecular weight binding protein has been demonstrated in a number of other insect species, but data about the nature and titre of the circulating hormones are lacking (for review see; de Kort and Granger, 1981).…”

Section: Discussionmentioning

confidence: 99%

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Binding and degradation of juvenile hormone III by haemolymph proteins of the Colorado potato beetle: A re-examination

Kort

Peter

Koopmanschap

1983

Insect Biochemistry

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Binding and degradation of juvenile hormone III by haemolymph proteins of the Colorado potato beetle: A re-examination It has a lower affinity for racemic JH-I and it does not bind JH-III-diol or JH-III-acid. The binding protein does discriminate between the enantiomers of synthetic, racemic JH-III as was determined by stereochemical anaysis of the bound and the free JH-III. Incubation of racemic JH-III with crude haemolymph results in preferential formation of (1 OS)-JH-III-acid, the unnatural configuration. The JH-esterase present in L. decemlineata haemolymph is not enantioselective. It is concluded that the most important function of the binding protein is that of a specific carrier, protecting the natural hormone against degradation by esterases. The carrier does not protect JH-I as efficiently as the lower homologue. U n i v e r s i t ä t P o t s d a m

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Section: Discussionmentioning

confidence: 99%

“…In addition, during circulation in the haemolymph, JH may be degraded by carboxylesterases or bind to specific or unspecific proteins or to the body wall or tissue membranes (for review see: de Kort and Granger, 1981).…”

Section: Introductionmentioning

confidence: 99%

Binding and degradation of juvenile hormone III by haemolymph proteins of the Colorado potato beetle: A re-examination

Kort

Peter

Koopmanschap

1983

Insect Biochemistry

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“…most esterases, indicating that they may have extensive biological functions. Esterases have been extensively studied in insects, where they have been shown to be involved in various physiological processes, including as regulators of juvenile hormone levels (Kort and Granger, 1981), in reproduction (Mane et al, 1983), nervous system function, and in the development of resistance to insecticides (Fournier et al, 1993). In plants, the differential expression of isoesterases have been used as a bacterial infection marker following pathogenesis (Pereira et al, 2001).…”

Section: Evaluation Of Genetic Diversity Of Endophyte Isolates Based mentioning

confidence: 99%

Molecular characterization of endophytes isolated from Saccharum spp based on esterase and ribosomal DNA (ITS1-5.8S-ITS2) analyses

Leme¹,

Bevilaqua²,

Rhoden³

et al. 2013

Genet. Mol. Res.

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ABSTRACT. This study used esterases and ribosomal DNA (rDNA) markers to determine endophytic variability in order to better understand endophyte-host interactions. Polyacrylamide gel electrophoresis and esterase isoenzymes (EST; EC 3.1.1.3), with a-naphthyl acetate and β-naphthyl acetate as substrates, were used to assess relationships among endophytes. ITS1-5.8S-ITS2 sequencing data were used as rDNA markers. Thirty-two esterases were obtained from 37 isolates of Saccharum spp, which clustered into five endophyte groups. Esterase EST-06 was observed with the highest frequency, being present in 22 of the 37 isolates analyzed, followed by esterase EST-11, which was present in 20 isolates. The esterases EST-10 and EST-14 were present in 19 isolates and EST-09 was present in 18 isolates. The esterase EST-01 was unique to isolate 33 and can, therefore, be used as a marker for this isolate. None of the esterases identified were common to all isolates tested. Similarly, phylogenetic analysis, based on rDNA sequence data, classified the isolates into 5 genus groups: 1) Curvularia with a 100% bootstrap value (BP), 2) Alternaria with 100% BP, 3) Epicoccum with 60% BP, 4) Phoma with 89% BP, and 5) Saccharicola with 100% BP. This polyphyletic analysis based on several markers, therefore, proved to be a valuable approach in determining the relationship between variation in endophytes and their associated host plants. Furthermore, both the esterase and rDNA analyses obtained similar results and were equally effective in resolving relationships.

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“…The a-and b-esterases have been extensively studied in insects and are known to be involved in different physiological processes, such as regulation of juvenile hormone levels (Kort and Granger, 1981), reproduction (Richmond et al, 1980), functioning of the nervous system and development of resistance to insecticides (Guillemaud et al, 1997).…”

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confidence: 99%

Esterase profile in a pyrethroid-resistant Brazilian strain of the cattle tick Boophilus microplus (Acari, Ixodidae)

et al. 2005

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The cattle tick Boophilus microplus causes great damage in livestock and is considered one of the most important tropical ectoparasites. The traditional method of control is based on the intensive use of pesticides, however the indiscriminate use of these compounds over the years has led to the selection of resistant ticks. Hydrolases, particularly esterases (EST), have been reported to be associated with acaricide resistance in B. microplus. We compared the esterase profile of susceptible and cypermethrin-resistant strains of adult B. microplus and a pyrethroid susceptible reference strain (the Mozzo strain) using polyacrylamide gel electrophoresis and specific staining. The electrophoretic profiles of protein extracts revealed the presence of four regions with esterase activity in the cypermethrin-resistant strain and three of these regions in the susceptible strains. The bands were numbered EST-1 to EST-4 in sequence (starting from the anode) according to their decrease in negative charge. The EST-1A and EST-1B enzymes were detected only in the resistant strain. The inhibition studies with eserine sulfate, copper sulfate, p-p-chloromercuribenzoate (pCMB), malathion and phenylmethylsulfonyl fluoride (PMSF) indicated that the EST-1A and EST-1B enzymes belong to the acetylcholinesterase class and are probably associated with resistance to acaricides in this Brazilian resistant strain of B. microplus.

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Regulation of the Juvenile Hormone Titer

Cited by 185 publications

References 1 publication

Binding and degradation of juvenile hormone III by haemolymph proteins of the Colorado potato beetle: A re-examination

Binding and degradation of juvenile hormone III by haemolymph proteins of the Colorado potato beetle: A re-examination

Molecular characterization of endophytes isolated from Saccharum spp based on esterase and ribosomal DNA (ITS1-5.8S-ITS2) analyses

Esterase profile in a pyrethroid-resistant Brazilian strain of the cattle tick Boophilus microplus (Acari, Ixodidae)

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