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Titolo:
The maize tha4 gene functions in Sec-independent protein transport in chloroplasts and is related to hcf106, tatA, and tatB
Autore:
Walker, MB; Roy, LM; Coleman, E; Voelker, R; Barkan, A;
Indirizzi:
Univ Oregon, Inst Mol Biol, Eugene, OR 97403 USA Univ Oregon Eugene OR USA 97403 egon, Inst Mol Biol, Eugene, OR 97403 USA
Titolo Testata:
JOURNAL OF CELL BIOLOGY
fascicolo: 2, volume: 147, anno: 1999,
pagine: 267 - 275
SICI:
0021-9525(19991018)147:2<267:TMTGFI>2.0.ZU;2-0
Fonte:
ISI
Lingua:
ENG
Soggetto:
DELTA-PH PATHWAY; THYLAKOID MEMBRANES; SIGNAL PEPTIDE; EXPORT SYSTEM; TRANSLOCATION; BACTERIA; HOMOLOG;
Keywords:
protein export; thylakoid; Mutator; maize; Sec-independent;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
30
Recensione:
Indirizzi per estratti:
Indirizzo: Barkan, A Univ Oregon, Inst Mol Biol, 1370 Franklin Blvd,Klamath 297, Eugene, OR 97403 USA Univ Oregon 1370 Franklin Blvd,Klamath 297 Eugene OR USA 97403 A
Citazione:
M.B. Walker et al., "The maize tha4 gene functions in Sec-independent protein transport in chloroplasts and is related to hcf106, tatA, and tatB", J CELL BIOL, 147(2), 1999, pp. 267-275

Abstract

Proteins are translocated across the chloroplast thylakoid membrane by a variety of mechanisms. Some proteins engage a translocation machinery that is derived from the bacterial Sec export system and require an interaction with a chloroplast-localized SecA homologue. Other proteins engage a machinery that is SecA-independent, but requires a transmembrane pH gradient. Recently, a counterpart to this Delta pH mechanism was discovered in bacteria. Genetic studies revealed that one maize protein involved in this mechanism,HCF106, is related in both structure and function to the bacterial tatA and tatB gene products. We describe here the mutant phenotype and molecular cloning of a second maize gene that functions in the Delta pH mechanism. This gene, thylakoid assembly 4 (tha4), is required specifically for the translocation of proteins that engage the a pH pathway. The sequence of the tha4gene product resembles those of the maize hcf106 gene and the bacterial tatA and tatB genes. Sequence comparisons suggest that tha4 more closely resembles tatA, and hcf106 more closely resembles tatB. These findings support the notion that this sec-independent translocation mechanism has been highly conserved during the evolution of eucaryotic organelles from bacterial endosymbionts.

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Documento generato il 20/01/21 alle ore 06:29:35