Is carbonic anhydrase activity of photosystem II required for its maximum electron transport rate?
نویسندگان
چکیده
منابع مشابه
Extrinsic photosystem II carbonic anhydrase in maize mesophyll chloroplasts.
One form of carbonic anhydrase (CA) has been observed in maize (Zea mays) thylakoids and photosystem II (PSII)-enriched membranes. Here, we show that an antibody produced against a thylakoid lumen-targeted CA found in Chlamydomonas reinhardtii reacts with a single 33-kD polypeptide in maize thylakoids. With immunoblot analysis, we found that this single polypeptide could be identified only in m...
متن کاملTransport Activity of the Sodium Bicarbonate Cotransporter NBCe1 Is Enhanced by Different Isoforms of Carbonic Anhydrase
Transport metabolons have been discussed between carbonic anhydrase II (CAII) and several membrane transporters. We have now studied different CA isoforms, expressed in Xenopus oocytes alone and together with the electrogenic sodium bicarbonate cotransporter 1 (NBCe1), to determine their catalytic activity and their ability to enhance NBCe1 transport activity. pH measurements in intact oocytes ...
متن کاملCrystal structure and functional characterization of photosystem II-associated carbonic anhydrase CAH3 in Chlamydomonas reinhardtii.
In oxygenic photosynthesis, light energy is stored in the form of chemical energy by converting CO2 and water into carbohydrates. The light-driven oxidation of water that provides the electrons and protons for the subsequent CO2 fixation takes place in photosystem II (PSII). Recent studies show that in higher plants, HCO3 (-) increases PSII activity by acting as a mobile acceptor of the protons...
متن کاملCarbonic anhydrase inhibitors in corneal endothelial transport.
PURPOSE Carbonic anhydrases play a central buffering role in current models of fluid transport in corneal endothelium, but in humans, clinical use of carbonic anhydrase inhibitors (CAIs) for the management of glaucoma does not cause corneal swelling. This study compares species differences in response to CAIs in human versus bovine corneal endothelial transport. METHODS Short-circuit current ...
متن کاملReport Number 568 Maximum Rate Analysis of Erythrocyte Carbonic Anhydrase in Hypercapnic Guinea Pigs
Studies have been made of the activity and concentration of erythrocyte carbonic anhydrase in guinea pigs exposed for up to seven days to atmospheres containing 15% CO2. Data are presented which indicate that adaptive processes tend to reduce the activity per mole of enzyme when the enzyme concentration is increased by such processes as hemoconcentration, i.e., during the first 24-48 hours of C...
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ژورنال
عنوان ژورنال: Biochimica et Biophysica Acta (BBA) - Bioenergetics
سال: 2018
ISSN: 0005-2728
DOI: 10.1016/j.bbabio.2018.01.009