Plastids form a major proteinaceous compartment in plant and algal cells. For example, chloroplasts contain 2000 to 2500 proteins  and account for 75% to 80% of the total nitrogen in a leaf . Also, the dry weight of a chloroplast is 50% to 60% protein . It is well known that the concentrations of apparently all proteins in plant cells result from both synthesis and degradation of the individual proteins . Thus, plastid proteins, like those in other compartments of eukaryotic cells, are continually synthesized and subsequently degraded by a variety of proteases. Also, many plastid proteins are first synthesized as precursor molecules that are then processed to mature forms by proteases in the organelle (e.g., Ref. ).
|Original language||English (US)|
|Title of host publication||Handbook of Photosynthesis, Second Edition|
|Number of pages||12|
|State||Published - Jan 1 2005|
ASJC Scopus subject areas
- Agricultural and Biological Sciences(all)