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Synthesis of diadenosine 5′,5‴‐P 1 ,P 4 ‐tetraphosphate by organellar and cytoplasmic phenylalanyl‐tRNA synthetases of Euglena gracilis
Author(s) -
Krauspe R.,
Parthier B.,
Wasternack C.
Publication year - 1988
Publication title -
febs letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.593
H-Index - 257
eISSN - 1873-3468
pISSN - 0014-5793
DOI - 10.1016/0014-5793(88)81278-x
Subject(s) - euglena gracilis , chloroplast , cytoplasm , transfer rna , biochemistry , enzyme , biology , glycogen phosphorylase , chemistry , stereochemistry , rna , gene
Purified phenylalanyl‐tRNA synthetases present in chloroplasts, mitochondria and cytoplasm of green and bleached Euglena gracilis strains, respectively, are able to synthesize diadenosine 5′,5‴‐P 1 ,P 4 ‐tetraphosphate (Ap 4 A). Ap 4 A synthesis is strictly dependent on zinc ions. This is the first evidence that chloroplasts should be able to synthesize Ap 4 A. Synthesis of Ap 4 A by phenylalanyl‐tRNA synthetases of the three compartments of a plant cell or by other enzymes such as Ap 4 A phosphorylase is discussed.