NDLI: Chloroplasts of the green alga Chlamydomonas reinhardtii possess at least four distinct stromal processing proteases

Content Provider	Springer Nature Link
Author	Rüfenacht, Andrea Boschetti, Arminjo
Copyright Year	2000
Abstract	The majority of the proteins in the chloroplast are encoded in the nucleus and synthesised in the cytoplasm as precursors with N-terminal extensions. These targeting sequences guide the precursor proteins into the chloroplast where they are immediately cleaved off by a stromal processing protease (SPP). It is commonly assumed that in higher plant chloroplasts one general SPP processes almost all imported precursor proteins. In the green alga Chlamydomonas, however, there exist several different SPPs which process the various Chlamydomonas precursor proteins. The seven precursor proteins investigated here, which were all correctly imported into isolated chloroplasts, could be divided into two groups: Four precursor proteins were cleaved correctly when processed in vitro with an extract of stromal proteins. Four different SPPs were found in Chlamydomonas chloroplasts to be responsible for the processing of this class of precursors and these four activities were separated chromatographically, characterised and further distinguished by their sensitivity to different inhibitors. The three precursors of the second group were degraded completely by unidentified enzyme(s) present in the stromal extract. Degradation of these precursors was dependent on their conformational integrity as well as on the redox state in the stroma.
Starting Page	249
Ending Page	258
Page Count	10
File Format	PDF
ISSN	01668595
Journal	Photosynthesis Research
Volume Number	63
Issue Number	3
e-ISSN	15735079
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2000-01-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Plant Physiology
Content Type	Text
Resource Type	Article
Subject	Cell Biology Plant Science Medicine Biochemistry

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