1. In vitro poly(ADP-ribosyl)ation of seminal ribonuclease
- Author
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Enzo Leone, Farina B, Hisanori Suzuki, Piera Quesada, H., Suzuki, P., Quesada, Farina, Benedetta, and E., Leone
- Subjects
Male ,Poly Adenosine Diphosphate Ribose ,RNase P ,Peptide ,Biochemistry ,Serine ,Ribonucleases ,Species Specificity ,Affinity chromatography ,Semen ,Aspartic acid ,Animals ,Trypsin ,Amino Acid Sequence ,Ribonuclease ,Molecular Biology ,Peptide sequence ,chemistry.chemical_classification ,biology ,Nucleoside Diphosphate Sugars ,Cell Biology ,Peptide Fragments ,Kinetics ,chemistry ,Glycine ,biology.protein ,Cattle - Abstract
The site of in vitro ADP-ribosylation of seminal ribonuclease was determined. Seminal enzyme was found to be a good receptor of [14C]ADP-ribose residues under the reaction conditions used. The recovery of [14C]ADP-ribosylated RNase was about 65% after purification. After tryptic digestion of modified enzyme, a fraction containing [14C]ADP-ribosylated peptides was separated from the others by ion-exchange chromatography on M82 resin. Radioactive peptides were then purified by affinity chromatography on anti-poly(ADP-ribose)IgG-Sepharose. High performance liquid chromatography of a mixture obtained after pronase digestion of purified ADP-ribosylated peptides revealed only one radioactive peptide whose amino acid composition corresponded to a peptide that has equimolar quantities of aspartic acid, serine, and glycine. Carboxypeptidase Y digestion of this peptide showed that its amino acid sequence was Asp-Ser-Gly. Only position 14-16 of seminal RNase corresponded to this sequence. The chemical stability of the ADP-ribose/enzyme linkage indicated that aspartic acid 14 is the modification site in seminal RNase.
- Published
- 1986