Detection of protoporphyrin IX in envelope membranes of pea chloroplasts.
Envelope membranes were prepared from mature pea chloroplasts. The tetrapyrrole contents of envelope membranes were analysed. The envelope membranes of pea chloroplasts contained substantial amounts of protoporphyrin IX and trace amounts of Mg-protoporphyrin IX and its monoester in addition to protochlorophyllide. The protoporphyrin IX content of envelope membranes was 89.25 pmol (mg protein)(-1). Its content in pea envelope membrane was higher than that of protochlorophyllide. The proportion of monovinyl and divinyl forms of protochlorophyllide present in pea chloroplast envelope membrane was 3:7. The significance of the presence of protoporphyrin IX in the envelope membrane is discussed in relation to plastidic Chl biosynthesis.
Mohapatra
Anasuya
A
School of Life Sciences, Jawaharlal Nehru University, New Delhi 110067, India.
Tripathy
Baishnab C
BC
D002736:Chloroplasts / Q000737:chemistry*; D007425:Intracellular Membranes / Q000737:chemistry*; D018532:Pisum sativum / Q000737:chemistry*; D010860:Pigments, Biological / Q000032:analysis; D010936:Plant Extracts / Q000737:chemistry; D011524:Protoporphyrins / Q000032:analysis*; D011758:Pyrroles / Q000032:analysis; D013050:Spectrometry, Fluorescence; D045725:Tetrapyrroles
D010860:Pigments, Biological; D010936:Plant Extracts; D011524:Protoporphyrins; D011758:Pyrroles; D045725:Tetrapyrroles; C028025:protoporphyrin IX