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| Content Provider | PubMed Central |
|---|---|
| Author | Stemler, Alan Murphy, Judith B. |
| Abstract | We tested a number of inhibitory monovalent anions for their primary site of action on photosystem II(PSII) in chloroplasts. We find that the inhibitory effects of F−, HCO2 −, NO2 −, NO3 −, and CH3CO2 − are all reversed by addition of a high concentration of HCO3 −. This class of anions competitively inhibits H14CO3 − binding to PSII. All of those anions tested reduced H14CO3 − binding more in the light than in the dark. We conclude that the primary inhibitory site of action of a number of monovalent anions is at the HCO3 − binding site(s) on the PSII complex. The carbonic anhydrase inhibitor gold cyanide, and also azide, inhibit PSII but at a site other than the HCO3 − binding site. We suggest that the unique ability of HCO3 − to reverse the effects of inhibitory anions reflects its singular ability to act as a proton donor/acceptor at the anion binding site. A similar role has been proposed for non-substrate-bound HCO3 − on carbonic anhydrase by Yeagle et al. (1975 Proc Natl Acad Sci USA 72: 454-458). |
| Starting Page | 974 |
| File Format | |
| ISSN | 15322548 |
| e-ISSN | 15322548 |
| Journal | Plant Physiology |
| Issue Number | 4 |
| Volume Number | 77 |
| Language | English |
| Publisher Date | 1985-04-01 |
| Access Restriction | Open |
| Subject Keyword | Research in Higher Education |
| Content Type | Text |
| Resource Type | Article |
| Subject | Genetics Physiology Plant Science |
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