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EUKARYOTIC CELL, Mar. 2008, p. 550553 Vol. 7, No. 3 1535-9778/08/$08.00 0 doi:10.1128/EC.00396-07
 

Summary: EUKARYOTIC CELL, Mar. 2008, p. 550553 Vol. 7, No. 3
1535-9778/08/$08.00 0 doi:10.1128/EC.00396-07
Copyright 2008, American Society for Microbiology. All Rights Reserved.
Evolutionary Dynamics of Light-Independent Protochlorophyllide
Oxidoreductase Genes in the Secondary Plastids of
Cryptophyte Algae
Anna Fong and John M. Archibald*
The Canadian Institute for Advanced Research, Integrated Microbial Biodiversity Program, Department of Biochemistry and
Molecular Biology, Dalhousie University, Halifax, Nova Scotia, Canada
Received 29 October 2007/Accepted 24 December 2007
Plastid genes encoding light-independent protochlorophyllide oxidoreductase (LIPOR) subunits were iso-
lated from cryptophyte algae, the first example of such genes in plastids of secondary endosymbiotic origin. The
presence of functional and nonfunctional copies of LIPOR genes in cryptophytes suggests that light-indepen-
dent chlorophyll biosynthesis is a nonessential pathway in these organisms.
The biosynthesis of chlorophyll is an indispensable process
in photosynthetic prokaryotes and eukaryotes. In plants and
algae, chlorophyll synthesis occurs in the plastid (chloroplast)
and involves two evolutionarily distinct enzymes, both of which
catalyze the reduction of protochlorophyllide to chlorophyllide
(30). Light-dependent protochlorophyllide oxidoreductase is

  

Source: Archibald, John - Department of Biochemistry and Molecular Biology, Dalhousie University

 

Collections: Biology and Medicine