Experientia

, Volume 38, Issue 2, pp 235–236 | Cite as

Tyrosine hydroxylase activity and tyrosine titers during cockroach metamorphosis

  • T. L. Hopkins
Specialia

Summary

Tyrosine hydroxylation (TH) to dopa in vivo in nymphs and pharate adults ofPeriplaneta americana was very low, but increased over 30-fold beginning at ecdysis. Free tyrosine increased in pharate, adults and peaked at ecdysis, whereas TH activity peaked 6 h later. Both TH activity and tyrosine titers declined the next 24 h as the cuticle tanned. TH appears to regulate tanning substrate biosynthesis in cockroaches.

Keywords

Tyrosine Tyrosine Hydroxylase Dopa Hydroxylase Activity Tyrosine Hydroxylase Activity 

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Copyright information

© Birkhäuser Verlag 1982

Authors and Affiliations

  • T. L. Hopkins
    • 1
  1. 1.Department of EntomologyKansas State UniversityManhattanUSA

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