Document Detail

The Effects of Cyanide and Azide on the Photoreduction of 3-Phosphoglycerate and Oxaloacetate by Wild Type and Two Reductive Pentose Phosphate Cycle Mutants of Chlamydomonas reinhardtii.
MedLine Citation:
PMID:  16662518     Owner:  NLM     Status:  PubMed-not-MEDLINE    
3-Phosphoglycerate- and oxaloacetate-dependent O(2) photoevolution by permeabilized cell preparations (Pressates), prepared from wild type (Wt) and two reductive pentose phosphate cycle mutants of Chlamydomonas reinhardtii showed different sensitivities to the inhibitors sodium cyanide and sodium azide. NaCN (1.5 millimolar) severely inhibits both CO(2)- and 3-phosphoglycerate-dependent O(2) photoevolution by the Wt Pressate, but does not inhibit 3-phosphoglycerate-dependent O(2) photoevolution by Pressates prepared from the mutants rcl-u-1-10-6C (which lacks ribulose, 1-5, bisphosphate carboxylase activity) and F60 (which lacks phosphoribulokinase activity). NaN(3) (0.5 millimolar) inhibits 3-phosphoglycerate-dependent O(2) photoevolution by the rcl-u-1-10-6C Pressate more severely than in the Pressates prepared from F60 and Wt. A higher concentration of NaN(3) (2.0 millimolar) severely inhibited oxaloacetate-dependent O(2) photoevolution by the rcl-u-1-10-6C, but not by the F60 Pressate. O(2) exchange-dependent upon methyl viologen was not strongly inhibited by 2 millimolar NaN(3) in either of the mutant Pressates. The data suggests that the mutational lesions which resulted in decreased ribulose-1,5-bisphosphate carboxylase and phosphoribulokinase activities effected changes in other photosynthetic reactions, either by direct interactions between component proteins or by causing changes in substrate or cofactor availability to the partial reactions.
W R Belknap; R K Togasaki
Related Documents :
15147198 - Insight into covalent flavinylation and catalysis from redox, spectral, and kinetic ana...
20060808 - An evolutionally conserved lys122 is essential for function in rhodospirillum rubrum bo...
9115248 - Residues essential for catalysis and stability of the active site of escherichia coli a...
16256968 - Functional requirements for the optimal catalytic configuration of the ache active center.
7756278 - Interdomain communication of t-cell cd4 studied by absorbance and fluorescence differen...
12482758 - Identification of a novel protein with guanylyl cyclase activity in arabidopsis thaliana.
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Plant physiology     Volume:  70     ISSN:  0032-0889     ISO Abbreviation:  Plant Physiol.     Publication Date:  1982 Aug 
Date Detail:
Created Date:  2010-06-29     Completed Date:  2010-06-29     Revised Date:  2010-09-14    
Medline Journal Info:
Nlm Unique ID:  0401224     Medline TA:  Plant Physiol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  469-75     Citation Subset:  -    
Department of Biology, Indiana University, Bloomington, Indiana 47401.
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms

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

Previous Document:  N Abundance of Nodules as an Indicator of N Metabolism in N(2)-Fixing Plants.
Next Document:  Metabolism and Translocation of Allantoin in Ureide-Producing Grain Legumes.