Journal Article

ATP-dependent Clp Proteases in Photosynthetic Organisms— A Cut Above the Rest!

ADRIAN K. CLARKE

in Annals of Botany

Published on behalf of The Annals of Botany Company

Volume 83, issue 6, pages 593-599
Published in print June 1999 | ISSN: 0305-7364
Published online June 1999 | e-ISSN: 1095-8290 | DOI: http://dx.doi.org/10.1006/anbo.1999.0878
ATP-dependent Clp Proteases in Photosynthetic Organisms— A Cut Above the Rest!

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Proteases are critical regulatory factors for many metabolic cellular processes as well as being vital for degrading proteins damaged during environmental stresses. Many of those responsible for targeted protein degradation require the hydrolysis of ATP, and one class that has attracted much attention recently are the Clp proteases. They are among the best characterized proteases to date, and were the first shown to rely on an ATPase regulatory subunit possessing molecular chaperone activity, which functions both within the proteolytic complex and independently. A range of Clp proteins has been identified from many different bacteria and eukaryotes, with by far the greatest number and diversity of forms in oxygenic photobionts such as cyanobacteria and higher plants. Functionally, Clp proteins have also evolved into one of the more critical proteolytic enzymes within photobionts, and it is now somewhat of a paradox that we currently know least about Clp protease functions in the photosynthetic organisms, where they have their most important roles. This discrepancy is now being addressed, with studies on Clp protein in cyanobacteria and, in an increasing number, in higher plants.Copyright 1999 Annals of Botany Company

Keywords: Chloroplasts, Clp proteins, cyanobacteria, molecular chaperones, proteolysis.

Journal Article.  7 words. 

Subjects: Ecology and Conservation ; Evolutionary Biology ; Plant Sciences and Forestry

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