Chloroplast membrane transport: Interplay of prokaryotic and eukaryotic traits

被引:41
作者
Vothknecht, UC [1 ]
Soll, H [1 ]
机构
[1] LMU Munchen, Inst Bot, Dept Biol 1, D-80638 Munich, Germany
关键词
thylakoid formation; metabolite transport; Tic and Toc; vesicle transport;
D O I
10.1016/j.gene.2005.04.021
中图分类号
Q3 [遗传学];
学科分类号
071007 ; 090102 ;
摘要
Chloroplasts are specific plant organelles of prokaryotic origin. They are separated from the surrounding cell by a double membrane, which represents an effective barrier for the transport of metabolites and proteins. Specific transporters in the inner envelope membrane have been described, which facilitate the exchange of metabolites. In contrast, the outer envelope has been viewed for a long time as a molecular sieve that offers a mere size constriction to the passage of molecules. This view has been challenged lately, and a number of specific and regulated pore proteins of the outer envelope (OEPs) have been identified. These pores seem to have originated by adaptation of outer membrane proteins of the cyanobacterial ancestor of the chloroplast. In a similar fashion, the transport of proteins across the two envelope membranes is achieved by two hetero-oligomeric protein complexes called Toc (translocon in the outer envelope of chloroplasts) and Tic (translocon in the inner envelope of chloroplasts). The phylogenetic provenance of the translocon components is less clear, but at least the channel protein of the Toc translocon is of cyanobacterial origin. Characteristic of cyanobacteria and chloroplasts is furthermore a specialized internal membrane system, the thylakoids, on which the components of the photosynthetic machinery are located. Despite the importance of this membrane, very little is known about its phylogenetic origin or the manner of its synthesis. Vipp1 appears to be a ubiquitous component of thylakoid formation, while in chloroplasts of land plants, additionally a vesicle transport system of eukaryotic origin might be involved in this process. (c) 2005 Elsevier B.V. All rights reserved.
引用
收藏
页码:99 / 109
页数:11
相关论文
共 70 条
[51]   The evolutionary origin of the protein-translocating channel of chloroplastic envelope membranes: Identification of a cyanobacterial homolog [J].
Reumann, S ;
Davila-Aponte, J ;
Keegstra, K .
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, 1999, 96 (02) :784-789
[52]   A chloroplast processing enzyme functions as the general stromal processing peptidase [J].
Richter, S ;
Lamppa, GK .
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, 1998, 95 (13) :7463-7468
[53]   The outer envelope protein OEP24 from pea chloroplasts can functionally replace the mitochondrial VDAC in yeast [J].
Röhl, T ;
Motzkus, M ;
Soll, J .
FEBS LETTERS, 1999, 460 (03) :491-494
[54]   Characterization of the translocon of the outer envelope of chloroplasts [J].
Schleiff, E ;
Soll, J ;
Küchler, M ;
Kühlbrandt, W ;
Harrer, R .
JOURNAL OF CELL BIOLOGY, 2003, 160 (04) :541-551
[55]   IDENTIFICATION OF INTERMEDIATES IN THE PATHWAY OF PROTEIN IMPORT INTO CHLOROPLASTS AND THEIR LOCALIZATION TO ENVELOPE CONTACT SITES [J].
SCHNELL, DJ ;
BLOBEL, G .
JOURNAL OF CELL BIOLOGY, 1993, 120 (01) :103-115
[56]   A consensus nomenclature for the protein-import components of the chloroplast envelope [J].
Schnell, DJ ;
Blobel, G ;
Keegstra, K ;
Kessler, F ;
Ko, K ;
Soll, J .
TRENDS IN CELL BIOLOGY, 1997, 7 (08) :303-304
[57]   Toc64, a new component of the protein translocon of chloroplasts [J].
Sohrt, K ;
Soll, J .
JOURNAL OF CELL BIOLOGY, 2000, 148 (06) :1213-1221
[58]   Protein import into chloroplasts [J].
Soll, J ;
Schleiff, E .
NATURE REVIEWS MOLECULAR CELL BIOLOGY, 2004, 5 (03) :198-208
[59]   Tic40, a new "old" subunit of the chloroplast protein import translocon [J].
Stahl, T ;
Glockmann, C ;
Soll, J ;
Heins, L .
JOURNAL OF BIOLOGICAL CHEMISTRY, 1999, 274 (52) :37467-37472
[60]   Toc34 is a preprotein receptor regulated by GTP and phosphorylation [J].
Sveshnikova, N ;
Soll, J ;
Schleiff, E .
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, 2000, 97 (09) :4973-4978