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Phenylalanine hydroxylase from the sponge Geodia cydonium: implication for allorecognition and evolution of aromatic amino acid hydroxylases.

Abstract：

:The prophenoloxidase activating system is a defense system, frequently reported both in protostomes and in deuterostomes. The final product of the phenoloxidase activity is melanin which is ubiquitously present throughout the metazoan kingdom. The melanin synthesis pathway starts with the amino acid [aa] phenylalanine which is converted to tyrosine by the phenylalanine hydroxylase [PAH]. We show that after allo-transplantation in the marine sponge Geodia cydonium PAH is upregulated in the grafts. Enzyme determination studies revealed that PAH activity increases by three-fold two d after transplantation and reaches its maximum after 3d (by 3.7-fold). This finding was supported by determining the steady-state level of the mRNA for PAH. Furthermore the cDNA, encoding this enzyme was isolated from G. cydonium. Its deduced aa sequence encodes a protein of 51 kDa. Alignment studies indicate that the sponge PAH shares the consensus pattern as well as one characteristic pterin-binding site with the biopterin-dependent aromatic amino acid hydroxylases. Phylogenetic analysis of sponge PAH shows that all metazoan PAH fall in one group with the sponge PAH as the oldest member. The related classes of enzymes, the tyrosine hydroxylases and the tryptophan hydroxylases are statistically significantly separated from PAH; the tyrosine hydroxylase diverged as the first class from the common ancestor, a process which was calculated to have occurred 500 million years ago. It is concluded that in the sponge model system G. cydonium allogeneic rejection involves an upregulation of PAH, an enzyme initiating the pathway to melanin synthesis.

journal_name

Dev Comp Immunol

journal_title

Developmental and comparative immunology

authors

Wiens M,Koziol C,Batel R,Müller WE

doi

10.1016/s0145-305x(98)00034-2

subject

Has Abstract

pub_date

1998-09-01 00:00:00

pages

469-78

issue

5-6

eissn

0145-305X

issn

1879-0089

pii

S0145-305X(98)00034-2

journal_volume

22

pub_type

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