SECA IS PLASTID-ENCODED IN A RED ALGA - IMPLICATIONS FOR THE EVOLUTION OF PLASTID GENOMES AND THE THYLAKOID PROTEIN IMPORT APPARATUS

被引：41
|
作者：
VALENTIN, K [1 ]
机构：
[1] UNIV WASHINGTON,DEPT BOT KB-15,SEATTLE,WA 98195
来源：
MOLECULAR & GENERAL GENETICS | 1993年 / 236卷 / 2-3期
关键词：
CHROMOPHYTA; PLASTID GENOME EVOLUTION; PROTEIN TRANSLOCATION; RHODOPHYTA; SECA; SECY;
D O I：
10.1007/BF00277119
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：
Partial sequence analysis of the plastid DNA (ptDNA) from a red alga, Antithamnion sp., revealed the presence of a homologue to the Escherichia coli secA gene as well as two open reading frames (ORF 510, ORF 179). In addition a secY homologue has been detected on the plastid genome by heterologous hybridization. None of these genes has been found in completely sequenced chlorophytic plastid genomes. SecA and sec Y gene copies were also detected in the ptDNA of a chromophytic alga, indicating that secAY may be ubiquitous in rhodophytes and chromophytes. The significance of these findings for the evolution of plastid genomes and the thylakoid protein import mechanism is discussed.
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页码：245 / 250
页数：6
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