CHLOROPLAST IMPORT AND SEQUENTIAL MATURATION OF PEA CARBONIC-ANHYDRASE - THE ROLES OF VARIOUS PARTS OF THE TRANSIT PEPTIDE

被引:12
作者
FORSMAN, C [1 ]
PILON, M [1 ]
机构
[1] UNIV UTRECHT,DEPT MOLEC CELL BIOL,3584 CH UTRECHT,NETHERLANDS
关键词
CARBONIC ANHYDRASE; CHLOROPLAST; TRANSIT PEPTIDE; PROCESSING;
D O I
10.1016/0014-5793(94)01391-D
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
Chloroplast pea carbonic anhydrase is synthesised in the cytosol with an unusually long bipartite N-terminal extension of the mature sequence previously proposed to serve as a transit peptide. Studies of import into pea chloroplasts show that the N-terminal 69 amino acids of the previously proposed transit peptide is sufficient for translocation and localisation to the stroma, while the acidic C-terminal part does not seem to have any function in these processes. Processing of the in vitro imported precursors is shown to be at a new cleavage site located in the middle of the actual transit peptide. The results indicate that maturation occurs in more than one step. The time-course does not seem to be dependent on the age of the chloroplast but on the age of the translocated precursor.
引用
收藏
页码:39 / 42
页数:4
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