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Arabidopsis nuclear-encoded plastid transit peptides contain multiple sequence subgroups with distinctive chloroplast-targeting sequence motifs

Title
Arabidopsis nuclear-encoded plastid transit peptides contain multiple sequence subgroups with distinctive chloroplast-targeting sequence motifs
Authors
Lee, DWKim, JKLee, SChoi, SKim, SHwang, I
POSTECH Authors
Choi, SKim, SHwang, I
Date Issued
Jan-2008
Publisher
AMER SOC PLANT BIOLOGISTS
Abstract
The N-terminal transit peptides of nuclear-encoded plastid proteins are necessary and sufficient for their import into plastids, but the information encoded by these transit peptides remains elusive, as they have a high sequence diversity and lack consensus sequences or common sequence motifs. Here, we investigated the sequence information contained in transit peptides. Hierarchical clustering on transit peptides of 208 plastid proteins showed that the transit peptide sequences are grouped to multiple sequence subgroups. We selected representative proteins from seven of these multiple subgroups and confirmed that their transit peptide sequences are highly dissimilar. Protein import experiments revealed that each protein contained transit peptide-specific sequence motifs critical for protein import into chloroplasts. Bioinformatics analysis identified sequence motifs that were conserved among members of the identified subgroups. The sequence motifs identified by the two independent approaches were nearly identical or significantly overlapped. Furthermore, the accuracy of predicting a chloroplast protein was greatly increased by grouping the transit peptides into multiple sequence subgroups. Based on these data, we propose that the transit peptides are composed of multiple sequence subgroups that contain distinctive sequence motifs for chloroplast targeting.
Keywords
AMINO-ACID-SEQUENCE; PROTEIN IMPORT; SUBCELLULAR-LOCALIZATION; MEMBRANE-PROTEIN; CENTRAL VACUOLE; GOLGI NETWORK; SMALL-SUBUNIT; PREDICTION; TRANSPORT; IDENTIFICATION
URI
http://oasis.postech.ac.kr/handle/2014.oak/28136
DOI
10.1105/TPC.108.0605
ISSN
1040-4651
Article Type
Article
Citation
PLANT CELL, vol. 20, no. 6, page. 1603 - 1622, 2008-01
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 KIM, SANGUK
Dept of Life Sciences
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