𝔖 Bobbio Scriptorium
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The role of nickel in urea assimilation by algae

✍ Scribed by T. A. V. Rees; I. A. Bekheet

Book ID
104753588
Publisher
Springer-Verlag
Year
1982
Tongue
English
Weight
302 KB
Volume
156
Category
Article
ISSN
0032-0935

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✦ Synopsis

Nickel is required for urease synthesis by Phaeodactylum tricornutum and Tetraselmis subcordiformis and for growth on urea by Phaeodactylum. There is no requirement for nickel for urea amidolyase synthesis by Chlorella fusca var. vacuolata. Neither copper nor palladium can substitute for nickel but cobalt partially restored urease activity in Phaeodactylum. The addition of nickel to nickel-deficient cultures of Phaeodactylum or Tetraselmis resulted in a rapid increase of urease activity to 7-30 times the normal level; this increase was not inhibited by cycloheximide. It is concluded that nickel-deficient cells over-produce a non-functional urease protein and that either nickel or the functional urease enzyme participates in the regulation of the production of urease protein.

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