Next Article in Journal
Next Article in Special Issue
Previous Article in Journal
Mar. Drugs 2010, 8(1), 106-121; doi:10.3390/md8010106
Article

Complementary UV-Absorption of Mycosporine-like Amino Acids and Scytonemin is Responsible for the UV-Insensitivity of Photosynthesis in Nostoc flagelliforme

1
, 2
, 1
 and 2,*
Received: 4 December 2009; in revised form: 5 January 2010 / Accepted: 19 January 2010 / Published: 20 January 2010
(This article belongs to the Special Issue Marine Photoprotective Compounds)
View Full-Text   |   Download PDF [219 KB, uploaded 20 January 2010]   |   Browse Figures
Abstract: Mycosporine-like amino acids (MAAs) and scytonemin are UV-screening compounds that have presumably appeared early in the history of life and are widespread in cyanobacteria. Natural colonies of the UV-insensitive Nostoc flagelliforme were found to be especially rich in MAAs (32.1 mg g DW-1), concentrated in the glycan sheath together with scytonemin. MAAs are present in the form of oligosaccharide-linked molecules. Photosystem II activity, measured using PAM fluorescence and oxygen evolution, was used as a most sensitive physiological parameter to analyse the effectiveness of UV-protection. Laboratory experiments were performed under controlled conditions with a simulated solar radiation specifically deprived of UV-wavebands with cut-off filters (295, 305, 320, 345 and 395 nm). The UV-insensitivity of N. flagelliforme was found to cover the whole UV-A (315–400 nm) and UV-B (280–320 nm) range and is almost certainly due to the complementary UV-absorption of MAAs and scytonemin. The experimental approach used is proposed to be suitable for the comparison of the UV-protection ability in organisms that differ in their complement of UV-sunscreen compounds. Furthermore, this study performed with a genuinely terrestrial organism points to the relevance of marine photoprotective compounds for life on Earth, especially for the colonization of terrestrial environments.
Keywords: mycosporine-like amino acids; Nostoc flagelliforme; scytonemin; photosynthesis; UV-radiation mycosporine-like amino acids; Nostoc flagelliforme; scytonemin; photosynthesis; UV-radiation
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Export to BibTeX |
EndNote


MDPI and ACS Style

Ferroni, L.; Klisch, M.; Pancaldi, S.; Häder, D.-P. Complementary UV-Absorption of Mycosporine-like Amino Acids and Scytonemin is Responsible for the UV-Insensitivity of Photosynthesis in Nostoc flagelliforme. Mar. Drugs 2010, 8, 106-121.

AMA Style

Ferroni L, Klisch M, Pancaldi S, Häder D-P. Complementary UV-Absorption of Mycosporine-like Amino Acids and Scytonemin is Responsible for the UV-Insensitivity of Photosynthesis in Nostoc flagelliforme. Marine Drugs. 2010; 8(1):106-121.

Chicago/Turabian Style

Ferroni, Lorenzo; Klisch, Manfred; Pancaldi, Simonetta; Häder, Donat-Peter. 2010. "Complementary UV-Absorption of Mycosporine-like Amino Acids and Scytonemin is Responsible for the UV-Insensitivity of Photosynthesis in Nostoc flagelliforme." Mar. Drugs 8, no. 1: 106-121.



Mar. Drugs EISSN 1660-3397 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert