NDLI: Carbonic Anhydrase in Calcified Endoskeleton: Novel Activity in Biocalcification in Alcyonarian

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Carbonic Anhydrase in Calcified Endoskeleton: Novel Activity in Biocalcification in Alcyonarian

Content Provider	Springer Nature Link
Author	Rahman, M. Azizur Oomori, Tamotsu Uehara, Tsuyoshi
Copyright Year	2007
Abstract	Carbonic anhydrase (CA) is a key enzyme in the chemical reaction of living organisms and has been found to be associated with calcification in a number of invertebrates including calcareous sponges, but until now no direct evidence has been advanced to show CA activity in alcyonarian corals. However, it is essential to understand the role of CA in the process of biocalcification in alcyonarian. Here we describe the novel activity of CA and its relationship to the formation of calcified hard tissues in alcyonarian coral, Lobophytum crassum. We find that two CA proteins, which were partially purified by electro-elution treatment, can control the morphology of CaCO3 crystals and one of them is potentially involved in the process of biocalcification. Previously, we isolated CA from the total extract of alcyonarian, and further, we report here a single protein, which has both calcium-binding and CA activities and is responsible for CaCO3 nucleation and crystal growth. This matrix protein inhibited the precipitation of CaCO3 from a saturated solution containing CaCl2 and NaHCO3, indicating that it can act as a negative regulator for calcification in the sclerites of alcyonarians. The effect of an inhibitor on the enzyme activity was also examined. These findings strongly support the idea that carbonic anhydrase domain in alcyonarian is involved in the calcification process. Our observations strongly suggest that the matrix protein in alcyonarian coral is not only a structural protein but also a catalyst.
Starting Page	31
Ending Page	38
Page Count	8
File Format	PDF
ISSN	14362228
Journal	Marine Biotechnology
Volume Number	10
Issue Number	1
e-ISSN	14362236
Language	English
Publisher	Springer-Verlag
Publisher Date	2007-09-22
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	alcyonarian coral biomineralization calcification calcite calcium carbonate carbonic anhydrase organic matrix protein sclerites Engineering Zoology Microbiology Freshwater & Marine Ecology
Content Type	Text
Resource Type	Article
Subject	Aquatic Science Biotechnology

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