Accession Number : AD0262091

Title :   THE MECHANISM OF PHOTOPHOSPHORYLATION IN CHLORO-PLASTS

Corporate Author : WEIZMANN INST OF SCIENCE REHOVOTH (ISRAEL)

Personal Author(s) : AVRON,M.

Report Date : 30 APR 1961

Pagination or Media Count : 1

Abstract : Utilizing O-18 labelled substrates, it was established that 1 atom of O enters from the water of the medium into each ATP molecule produced. In addition the location of the phosphate oxygens, the possibility of interfering side reactions and the source of the new bridging oxygen atom in the ATP molecule were determined. The inhibitory effect of UV irradiation on the Hill reaction and photophosphorylation was quantitatively determined. A positive correlation was established between the destruction of coenzyme Q sub 255 and the inactivation of the photosynthetic reactions brought about by UV irradiation. By taking advantage of the properties of a photophosphorylative system, ATP or ADP labelled at specific and different sites with P-32 was synthesized. By a modification, the method could be used for the synthesis of many other P-32 labelled compounds. Light activated Pi-ATP exchange was discovered to be present in chloroplasts. (Author)

Descriptors :   *ADENOSINE PHOSPHATES, *NUCLEOTIDES, *PHOSPHORYLATION, *PHOTOCHEMICAL REACTIONS, BIOCHEMISTRY, CHLOROPHYLLS, ENZYMES, EXCHANGE REACTIONS, LABELED SUBSTANCES, OXYGEN, PHOSPHORUS COMPOUNDS, SYNTHESIS, ULTRAVIOLET RADIATION

Distribution Statement : APPROVED FOR PUBLIC RELEASE