Photolyase/Cryptochrom-Homologe aus Synechocystis sp. PCC 6803 und Arabidopsis thaliana: Funktion, Lokalisation und biochemische Eigenschaften
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Philipps-Universität Marburg
Abstract
Cryptochromes (CRY) are blue/UV-A photoreceptors related to the DNA-repair
enzyme DNA-photolyase.
So far, they have been found in plants, animals and humans.
However, their evolutionary origin is unclear. Sequence comparisons indicated
that cryptochromes may have arisen twice during evolution, the plant
photoreceptors from the class I CPD DNA-photolyases, and the animal
cryptochromes from (6-4) photolyases (Kobayashi et al., 2000).
Here we show that the Synechocystis gene sll1629 encodes a cryptochrome type
photoreceptor.
Thus, cryptochromes already exist in cyanobacteria. Closely related to sll1629
is the Arabidopsis gene At5g24850. Its encoded protein carries a dual transit
sequence and is targeted to chloroplasts and mitochondria. Thus, CRYs may have
been transferred to plants from the photosynthetic endosymbiont. However,
Arabidopsis CRY1 and CRY2 are only distantly related to sll1629 but more
closely to sequences in ? -proteobacteria, which indicates that plants may
have received the cryptochromes by a dual horizontal gene transfer.
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This item has been published with the following license: In Copyright