Article (Scientific journals)
Raman characterization of the UV-protective pigment gloeocapsin and its role in the survival of cyanobacteria
Storme, Jean-Yves; Golubic, Stjepko; Wilmotte, Annick et al.
2015In Astrobiology, 15 (10)
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Keywords :
cyanobacteria; pigment; gleoecapsine; RAMAN microspectrometry; biosignatures
Abstract :
[en] Extracellular UV-screening pigments gloeocapsin and scytonemin present in the EPS envelopes of extremophile cyanobacteria of freshwater and marine environments were studied by Raman spectroscopy and compared to their intracellular photosynthetic pigments. This Raman spectral analysis of the extracellular pigment gloeocapsin showed that it shared Raman spectral signatures with parietin, a radiation-protective pigment known in lichens. The UV-light spectra also showed similarities. Gloeocapsin occurs in some cyanobacterial species, mostly with exclusion of scytonemin, indicating that these pigments have evolved in cyanobacteria as separate protective strategies. Both gloeocapsin and scytonemin are widely and species-specifically distributed in different cyanobacterial genera and families. The widespread occurrence of these pigments may suggest an early origin, while their detection by Raman Spectroscopy makes them potential biosignatures for cyanobacteria in the fossil record and demonstrates the usefulness of non-destructive Raman spectroscopy analyses for the search of complex organics, including possible photosynthetic pigments, if preservable in early Earth and extraterrestrial samples.
Research center :
CIP - Centre d'Ingénierie des Protéines - ULiège
Disciplines :
Earth sciences & physical geography
Biochemistry, biophysics & molecular biology
Microbiology
Author, co-author :
Storme, Jean-Yves ;  Université de Liège > Département de géologie > Paléobiogéologie - Paléobotanique - Paléopalynologie (PPP)
Golubic, Stjepko
Wilmotte, Annick  ;  Université de Liège > Département des sciences de la vie > Physiologie et génétique bactériennes
Kleinteich, Julia ;  Université de Liège > Département des sciences de la vie > Physiologie et génétique bactériennes
Velazquez, David
Javaux, Emmanuelle  ;  Université de Liège > Département de géologie > Paléobiogéologie - Paléobotanique - Paléopalynologie (PPP)
Language :
English
Title :
Raman characterization of the UV-protective pigment gloeocapsin and its role in the survival of cyanobacteria
Publication date :
2015
Journal title :
Astrobiology
ISSN :
1531-1074
eISSN :
1557-8070
Publisher :
Mary Ann Liebert, Inc., New Rochelle, United States - New York
Volume :
15
Issue :
10
Peer reviewed :
Peer Reviewed verified by ORBi
European Projects :
FP7 - 308074 - ELITE - Early Life Traces, Evolution, and Implications for Astrobiology
Funders :
F.R.S.-FNRS - Fonds de la Recherche Scientifique [BE]
UE - Union Européenne [BE]
BELSPO - SPP Politique scientifique - Service Public Fédéral de Programmation Politique scientifique
CE - Commission Européenne [BE]
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