Is ftsH the key to plastid longevity in sacoglossan slugs?
Is ftsH the key to plastid longevity in sacoglossan slugs?
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DOI：
10.1093/gbe/evt205
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发表时间：
2013
影响因子：
3.3
通讯作者：
Gould SB
中科院分区：
文献类型：
--
作者：
de Vries J;Habicht J;Woehle C;Huang C;Christa G;Wägele H;Nickelsen J;Martin WF;Gould SB
被囊舌海蛞蝓隔离的质体长期以来一直是一个谜。有些囊舌藻以管藻为食，并能将质体保留在其消化腺细胞的胞质溶胶中。在那里，被盗的质体（kleptoplasts）在某些情况下可以保持光合作用活性数月。纤质体寿命本身挑战了目前关于光系统周转的范式，因为纤质体光系统在没有核藻类基因的情况下仍然活跃。在高等植物中，核基因对于质体的维持是必不可少的，特别是对于光系统II的D1蛋白的持续修复。横向基因转移一直被怀疑是支撑蛞蝓kleptoplast寿命，但最近的转录组学和基因组学分析表明，没有藻类核基因的蛞蝓核表达。然而，纤质体基因组本身似乎在隔离状态下表达。在这里，我们提出的序列数据的叶绿体基因组的髋臼，食物来源的sacoglossan Elysia timida，它可以保持髋臼kleptoplasts在一个活跃的状态数月。这些数据揭示了什么可能是sacoglossan kleptoplast寿命的关键：在蛞蝓内保持光合作用活性数月的质体共享编码ftsH的特性，ftsH是一种D1质量控制蛋白酶，对光系统II修复至关重要。在陆生植物中，ftsH通常由细胞核编码，在轮藻门和胚藻门分裂时从质体基因组转移到细胞核中。原则上，一个可再生的供应ftsH可以拯救kleptoplasts从D1光损伤，从而影响质体寿命sacoglossan蛞蝓。
Plastids sequestered by sacoglossan sea slugs have long been a puzzle. Some sacoglossans feed on siphonaceous algae and can retain the plastids in the cytosol of their digestive gland cells. There, the stolen plastids (kleptoplasts) can remain photosynthetically active in some cases for months. Kleptoplast longevity itself challenges current paradigms concerning photosystem turnover, because kleptoplast photosystems remain active in the absence of nuclear algal genes. In higher plants, nuclear genes are essential for plastid maintenance, in particular, for the constant repair of the D1 protein of photosystem II. Lateral gene transfer was long suspected to underpin slug kleptoplast longevity, but recent transcriptomic and genomic analyses show that no algal nuclear genes are expressed from the slug nucleus. Kleptoplast genomes themselves, however, appear expressed in the sequestered state. Here we present sequence data for the chloroplast genome of Acetabularia acetabulum, the food source of the sacoglossan Elysia timida, which can maintain Acetabularia kleptoplasts in an active state for months. The data reveal what might be the key to sacoglossan kleptoplast longevity: plastids that remain photosynthetically active within slugs for periods of months share the property of encoding ftsH, a D1 quality control protease that is essential for photosystem II repair. In land plants, ftsH is always nuclear encoded, it was transferred to the nucleus from the plastid genome when Charophyta and Embryophyta split. A replenishable supply of ftsH could, in principle, rescue kleptoplasts from D1 photodamage, thereby influencing plastid longevity in sacoglossan slugs.
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DOI：
10.1016/j.jembe.2010.08.021
发表时间：
2010-11-15
影响因子：
2
作者：
Jesus, Bruno;Ventura, Patricia;Calado, Goncalo
通讯作者：
Calado, Goncalo
DOI：
10.1038/newbio236056a0
发表时间：
1972-01-01
期刊：
NATURE-NEW BIOLOGY
影响因子：
--
作者：
GILES, KL;SARAFIS, V
通讯作者：
SARAFIS, V
影响因子：
2
作者：
Habetha, M;Anton-Erxleben, F;Bosch, TCG
通讯作者：
Bosch, TCG
影响因子：
10.7
作者：
Bhattacharya D;Pelletreau KN;Price DC;Sarver KE;Rumpho ME
通讯作者：
Rumpho ME
影响因子：
1.2
作者：
Curtis, Nicholas E.;Massey, Steven E.;Pierce, Sidney K.
通讯作者：
Pierce, Sidney K.