PMID: 2497447Mar 1, 1989Paper

Melanogenesis in the pigment cells of Rana esculenta L. liver: evidence for tyrosinase-like activity in the melanosome protein fraction

Pigment Cell Research
R CiceroG Pintucci

Abstract

This work demonstrates the presence of a tyrosinase-like activity in the pigment cells of frog Rana esculenta L. liver. The activity was evidenced in the protein melanosome fraction extracted with differential centrifugation methods. The study of this activity, carried out with spectrophotometric methods, indicates 1) the system presents the characteristics of an allosteric enzyme; 2) the grade of cooperativity shows oscillations going from negative cooperativity toward the substrate, evident in the warmest months of the year, to an absence of cooperativity in the coldest months of the year; and 3) the levels of activity of the system also vary according to season, with the highest levels appearing in the coldest months of the year. Given that this extracutaneous system of pigment cells, different from melanocytes, is able to carry out melanogenesis, we suggest its inclusion in the classification of pigment cells.

References

Feb 2, 1979·Science·J T BagnaraJ D Taylor
Jan 1, 1988·Pigment Cell Research·G Sichel
Jan 1, 1982·Comparative Biochemistry and Physiology. A, Comparative Physiology·R CiceroG Sichel

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Citations

Jan 1, 1992·Biulleten' eksperimental'noĭ biologii i meditsiny·M M Kalashnikova
Jul 1, 1990·In Vitro Cellular & Developmental Biology : Journal of the Tissue Culture Association·G PintucciR Cicero
Jun 25, 1998·In Vitro Cellular & Developmental Biology. Animal·G GuidaR Cicero
Jan 1, 1990·Comparative Biochemistry and Physiology. B, Comparative Biochemistry·R CiceroG Pintucci
Oct 1, 1992·Comparative Biochemistry and Physiology. B, Comparative Biochemistry·U Schraermeyer
Feb 12, 2002·Pigment Cell Research·Anna GalloneRosa Cicero
Mar 1, 1990·Pigment Cell Research·C CorsaroG Sichel
Dec 1, 2012·Biochemistry and Cell Biology = Biochimie Et Biologie Cellulaire·Marcella ArciuliAnna Gallone
Dec 23, 2008·Comparative Biochemistry and Physiology. Part B, Biochemistry & Molecular Biology·Paola T ZannaGabriella Guida
Oct 28, 2008·Comparative Biochemistry and Physiology. Part B, Biochemistry & Molecular Biology·I MaidaR Cicero
Jun 2, 2007·The Anatomical Record : Advances in Integrative Anatomy and Evolutionary Biology·Rodrigo ZieriClassius de Oliveira
Feb 1, 2014·The Anatomical Record : Advances in Integrative Anatomy and Evolutionary Biology·Lia Raquel De Souza SantosClassius De Oliveira
Jul 12, 2002·Microscopy Research and Technique·Giovanni SichelConcetta Corsaro

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