Detection of an L-amino acid dehydrogenase activity in Synechocystis sp. PCC 6803

Schriek S, Kahmann U, Staiger D, Pistorius EK, Michel K-P (2009)
Journal of Experimental Botany 60(3): 1035-1046.

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Abstract
The protein Slr0782 from Synechocystis sp. PCC 6803, which has similarity to L-amino acid oxidase from Synechococcus elongatus PCC 6301 and PCC 7942, has been characterized in part. Immunoblot blot analysis showed that Slr0782 is mainly thylakoid membrane-associated. Moreover, expression of slr0782 mRNA and Slr0782 protein were analyzed and an activity assay was developed. Utilizing toluene-permeabilized cells, an L-arginine-stimulated O2 uptake became detectable in Synechocystis sp. PCC 6803. Besides oxidizing the basic L-amino acids L-arginine, L-lysine, L-ornithine, and L-histidine, a number of other L-amino acids were also substrates, while D-amino acids were not. The best substrate was L-cysteine, and the second best was L-arginine. The L-arginine-stimulated O2 uptake was inhibited by cations. The inhibition by o-phenanthroline and salicylhydroxamic acid suggested the presence of a transition metal besides FAD in the enzyme. Moreover, it is shown that inhibitors of the respiratory electron transport chain, such as KCN and 2,5-dibromo-3-methyl-6-isopropyl-p-benzoquinone, also inhibited the L-arginine-stimulated O2 uptake, suggesting that Slr0782 functions as an L-arginine dehydrogenase, mediating electron transfer from L-arginine into the respiratory electron transport chain utilizing O2 as electron acceptor via cytochrome oxidase. The results imply that Slr0782 is an additional substrate dehydrogenase being able to interact with the electron transport chain of the thylakoid membrane.
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Schriek S, Kahmann U, Staiger D, Pistorius EK, Michel K-P. Detection of an L-amino acid dehydrogenase activity in Synechocystis sp. PCC 6803. Journal of Experimental Botany. 2009;60(3):1035-1046.
Schriek, S., Kahmann, U., Staiger, D., Pistorius, E. K., & Michel, K. - P. (2009). Detection of an L-amino acid dehydrogenase activity in Synechocystis sp. PCC 6803. Journal of Experimental Botany, 60(3), 1035-1046.
Schriek, S., Kahmann, U., Staiger, D., Pistorius, E. K., and Michel, K. - P. (2009). Detection of an L-amino acid dehydrogenase activity in Synechocystis sp. PCC 6803. Journal of Experimental Botany 60, 1035-1046.
Schriek, S., et al., 2009. Detection of an L-amino acid dehydrogenase activity in Synechocystis sp. PCC 6803. Journal of Experimental Botany, 60(3), p 1035-1046.
S. Schriek, et al., “Detection of an L-amino acid dehydrogenase activity in Synechocystis sp. PCC 6803”, Journal of Experimental Botany, vol. 60, 2009, pp. 1035-1046.
Schriek, S., Kahmann, U., Staiger, D., Pistorius, E.K., Michel, K.-P.: Detection of an L-amino acid dehydrogenase activity in Synechocystis sp. PCC 6803. Journal of Experimental Botany. 60, 1035-1046 (2009).
Schriek, Sarah, Kahmann, Uwe, Staiger, Dorothee, Pistorius, Elfriede K., and Michel, Klaus-Peter. “Detection of an L-amino acid dehydrogenase activity in Synechocystis sp. PCC 6803”. Journal of Experimental Botany 60.3 (2009): 1035-1046.
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New insights into the function of the iron deficiency-induced protein C from Synechococcus elongatus PCC 7942.
Pietsch D, Bernat G, Kahmann U, Staiger D, Pistorius EK, Michel KP., Photosyn. Res. 108(2-3), 2011
PMID: 21607697

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