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Title: Location of intrinsic and inducible phenoloxidase activity in molluscan hemocyanin
Authors: Siddiqui, Nurul Islam ×
Akosung, Roland Forben
Gielens, Constant #
Issue Date: Jan-2006
Publisher: Academic press inc elsevier science
Series Title: Biochemical and Biophysical Research Communications vol:348 issue:3 pages:1138-1144
Abstract: The phenoloxidase (PO) activity of the hemocyanins (Hcs) from two molluscan species, the gastropod Helix pomatia (Hp) and the cephalopod Sepia officinalis (So), was studied. With catechol as substrate the Hcs showed a weak o-diPO activity, which was moderately enhanced on limited proteolysis with subtilisin. The sites in the Hc molecules mainly responsible for this activity were identified. The highest intrinsic o-diPO activity and also by far the highest level of induction were found in the functional units (FUs) Hp f and So g, isolated from Hp beta-Hc and So Hc (subunit 2), respectively. The results thus support the earlier conclusion, made on the basis of sequence homology between molluscan Hcs, that Hp f and So g are functional and structural analogues. The subtilisin treatment of Hp f also induced monoPO activity, considered to be at the origin of browning of the sample. (c) 2006 Elsevier Inc. All rights reserved.
URI: 
ISSN: 0006-291X
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Biochemistry, Molecular and Structural Biology Section
× corresponding author
# (joint) last author

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