Cyclic, pseudocyclic and noncyclic photophosphorylation: new links in the chain.

نویسنده

  • John F Allen
چکیده

Photosynthetic electron transport is coupled to ATP synthesis. This process - photosynthetic phosphorylation - proceeds by several alternative electron-transport pathways in isolated chloroplasts. The question: 'Which of these works in real life?' has long occupied students of photosynthesis. Recent results from structural biology and genomics suggest that the answer is 'All of them'. The interplay between the pathways might explain the flexibility of photosynthesis in meeting different metabolic demands for ATP.

برای دانلود رایگان متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

OXYGEN EVOLUTION IN PHOTOSYNTHESIS 683 Chloride Requirement for Oxygen Evolution in Photosynthesis

The role of chloride in photosynthetic oxygen evolution was reinvestigated by determining the effect of this ion on photochemical reactions of chloroplasts in which oxygen either is or is not produced. The chloroplasts used were isolated from normal spinach leaves. The level of chloride in the reaction mixture was controlled by washing the isolated chloroplasts and by avoiding a chloride contam...

متن کامل

Cyclic and Noncyclic Photophosphorylation in Isolated Guard Cell Chloroplasts from Vicia faba L.

High rates of both cyclic and noncyclic photophosphorylation were measured in chloroplast lamellae isolated from purified guard cell protoplasts from Vicia faba L. Typical rates of light-dependent incorporation of (32)P into ATP were 100 and 190 micromoles ATP per milligram chlorophyll per hour for noncyclic (water to ferricyanide) and cyclic (phenazine methosulfate) photophosphorylation, respe...

متن کامل

The light reactions of photosynthesis.

Historically, the role of light in photosynthesis has been ascribed either to a photolysis of carbon dioxide or to a photolysis of water and a resultant rearrangement of constituent atoms into molecules of oxygen and glucose (or formaldehyde). The discovery of photophosphorylation demonstrated that photosynthesis includes a light-induced phosphorus metabolism that precedes, and is independent f...

متن کامل

Coincidence Quasi-Best Proximity Points for Quasi-Cyclic-Noncyclic Mappings in Convex Metric Spaces

We introduce the notion of quasi-cyclic-noncyclic pair and its relevant new notion of coincidence quasi-best proximity points in a convex metric space. In this way we generalize the notion of coincidence-best proximity point already introduced by M. Gabeleh et al cite{Gabeleh}. It turns out that under some circumstances this new class of mappings contains the class of cyclic-noncyclic mappings ...

متن کامل

Photosynthesis by isolated chloroplasts. X. Dependence of carbon dioxide assimilation on the photochemical reactions of chloroplasts.

In addition to photosynthetic phosphorylation recent work has also provided direct experimental evidence (10-14) for the often asserted but never previously demonstrated capacity of isolated chloroplasts to assimilate CO2 photosynthetically to the level of carbohydrates. CO2 assimilation by isolated chloroplasts was found to be a dark process (15) dependent on a photochemically generated “assim...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

عنوان ژورنال:
  • Trends in plant science

دوره 8 1  شماره 

صفحات  -

تاریخ انتشار 2003