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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Mulligan, R. M. Houtz, R. L. Tolbert, N. E. |
| Description | Author Affiliation: Mulligan RM ( Department of Biological Sciences, Stanford University, CA 94305.); |
| Abstract | Trypsin rapidly inactivated the catalytic activities of spinach ribulose bisphosphate carboxylase/oxygenase [3-phospho-D-glycerate carboxy-lyase (dimerizing), EC 4.1.1.39], but the stoichiometry of binding of the reaction-intermediate analogue carboxyarabinitol bisphosphate was only slightly reduced after proteolysis. Electrophoretic analysis indicated that several forms of the large subunit were generated during proteolysis but that the small subunit was resistant. Three tryptic peptides were isolated and characterized after digestion of the activated enzyme; the tryptic-sensitive sites were identified at Lys-8, Lys-14, and Lys-466 of the large subunit. Tryptic digestion of the enzyme complexed with the reaction-intermediate analogue released only two peptides by hydrolysis at Lys-8 and at Lys-14. The loss of susceptibility of Lys-466 to trypsin may be the result of a conformational change that limits the accessibility of the carboxyl-terminal region after binding of the reaction-intermediate analogue. Analysis of the amino-terminal tryptic peptide by composition and fast atom bombardment mass spectrometry demonstrated that the actual amino-terminal residue is proline at position 3 of the DNA-deduced sequence and that this proline is blocked with an N-acetyl moiety. Thus, posttranslational processing of the chloroplast-encoded large subunit of the enzyme must occur to remove Met-1 and Ser-2 and to acetylate the amino terminus. |
| ISSN | 00278424 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 5 |
| Volume Number | 85 |
| Language | English |
| Publisher | National Academy of Sciences |
| Publisher Date | 1988-04-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Ribulose-Bisphosphate Carboxylase Physiology Acetylation Mass Spectrometry Peptide Mapping Plants Proline Analogs & Derivatives Structure-Activity Relationship Trypsin Pharmacology Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, Non-P.H.S. Research Support, U.S. Gov't, P.H.S. Multidisciplinary |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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