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Titolo:
PROTEIN IMPORT INTO CHLOROPLASTS
Autore:
LUBECK J; HEINS L; SOLL J;
Indirizzi:
CHRISTIAN ALBRECHTS UNIV KIEL,INST BOT,GUTENBERGSTR 76-78 D-24098 KIEL GERMANY CHRISTIAN ALBRECHTS UNIV KIEL,INST BOT D-24098 KIEL GERMANY
Titolo Testata:
Physiologia Plantarum
fascicolo: 1, volume: 100, anno: 1997,
pagine: 53 - 64
SICI:
0031-9317(1997)100:1<53:PIIC>2.0.ZU;2-M
Fonte:
ISI
Lingua:
ENG
Soggetto:
OUTER ENVELOPE MEMBRANE; HEAT-SHOCK PROTEIN; CYANOBACTERIUM SYNECHOCOCCUS PCC7942; MITOCHONDRIAL INTERMEMBRANE SPACE; LENGTH CDNA CLONE; PRECURSOR PROTEINS; TRANSIT PEPTIDE; PHOSPHATE TRANSLOCATOR; THYLAKOID MEMBRANES; PEA-CHLOROPLASTS;
Keywords:
CHLOROPLASTS; ENVELOPE MEMBRANES; IMPORT APPARATUS; PROTEIN TRANSPORT; SORTING; TARGETING;
Tipo documento:
Review
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
131
Recensione:
Indirizzi per estratti:
Citazione:
J. Lubeck et al., "PROTEIN IMPORT INTO CHLOROPLASTS", Physiologia Plantarum, 100(1), 1997, pp. 53-64

Abstract

Most chloroplastic proteins are encoded in the nucleus, synthesized on cytosolic ribosomes and subsequently imported into the organelle, Ingeneral, proteins destined for the chloroplast are synthesized as precursor proteins with a cleavable N-terminal presequence that mediates routing to the inside of the chloroplast. These precursor proteins have to be targeted to the correct organellar membrane surface after their release from the ribosome and furthermore they have to be maintainedin a conformation suitable for translocation across the two envelope membranes. Recognition and import of most chloroplastic precursor proteins are accomplished by a jointly used translocation apparatus. Different but complementary studies of several groups converged recently inthe identification of the outer envelope proteins OEP86, OEP75, OEP70(a Hsp70-related protein), OEP34, and of the inner envelope protein IEP110 as components of this translocation machinery. None of these proteins, except for OEP70, shows any homology to components of other protein translocases. The plastid import machinery thus seems to be an original development in evolution. Following translocation into the organelle, chloroplastic proteins are sorted to their suborganellar destination, i.e., the inner envelope membrane, the thylakoid membrane, and the thylakoid lumen. This structural and evolutionary complexity of chloroplasts is reflected by a variety of routing mechanisms by which proteins reach their final location once inside the organelle. This review will focus on recent advances in the identification of components of the chloroplastic protein import machinery, and new insights into the pathways of inter and intraorganellar sorting.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 29/03/20 alle ore 09:08:16