Document Detail


Properties of synthesis of chlorophyll a from chlorophyll b in cucumber etioplasts.
MedLine Citation:
PMID:  8071325     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Chlorophyll a accumulated when chlorophyllide b was incubated with isolated cucumber etioplasts in the dark. When [14C]chlorophyllide b was used as the substrate for chlorophyll synthesis, [14C]chlorophyll a was formed, showing that chlorophyll a was synthesized from the exogenously added chlorophyllide b, not by light-independent reduction of endogenous protochlorophyllide. The reaction studied showed an optimal pH of 7.5 and required both the soluble and membrane fractions of etioplasts together with ATP. Time course experiments showed that chlorophyll a began to accumulate later than chlorophyll b. Chlorophyllide b esterified with geranylgeraniol accumulated first, but there was little accumulation of chlorophyll a with an unhydrogenated prenyl side chain. No chlorophyllide a was detected during incubation. These observations indicate that esterified chlorophyll b was converted to chlorophyll a. This conversion would play an important role in the use of chlorophyll b for the synthesis of chlorophyll a in the reconstruction of photosystems.
Authors:
H Ito; S Takaichi; H Tsuji; A Tanaka
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  The Journal of biological chemistry     Volume:  269     ISSN:  0021-9258     ISO Abbreviation:  J. Biol. Chem.     Publication Date:  1994 Sep 
Date Detail:
Created Date:  1994-09-29     Completed Date:  1994-09-29     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  2985121R     Medline TA:  J Biol Chem     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  22034-8     Citation Subset:  IM    
Affiliation:
Department of Botany, Faculty of Science, Kyoto University, Japan.
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MeSH Terms
Descriptor/Qualifier:
Chlorophyll / metabolism*
Chlorophyllides / metabolism
Organelles / metabolism*
Vegetables / metabolism*
Chemical
Reg. No./Substance:
0/Chlorophyllides; 1406-65-1/Chlorophyll; 14428-12-7/chlorophyllide b; 479-61-8/chlorophyll a; 519-62-0/chlorophyll b

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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