Biotransformation of mycosporine like amino acids (MAAs) in the toxic dinoflagellate Alexandrium tamarense

Callone, Alan I.; Carignan, Mario O.; Montoya, Nora G.; Carreto, José I.

doi:10.1016/j.jphotobiol.2006.03.001

Cited by 44 publications

(69 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The response kinetics of Prorocentrum micans to PAR and PAR+UVR were confirmed, and were similar to those reported for other groups of dinoflagellates (Carreto et al 1990, Taira et al 2004a, Callone et al 2006. Under the PAR conditions, two patterns of the responses in the cellular contents of individual MAAs with and without delayed initial responses were characterized in this organism.…”

Section: Response Of Maa Synthesis To Uvrsupporting

confidence: 83%

“…Under the PAR conditions, two patterns of the responses in the cellular contents of individual MAAs with and without delayed initial responses were characterized in this organism. Shinorine and mycosporine-glycine were the most abundant MAAs and their response determined the overall MAA pattern, which was also observed in another study (Callone et al 2006). Under PAR+UVR conditions, the response time seems to vary among dinoflagellates (Callone et al 2006, present study).…”

Section: Response Of Maa Synthesis To Uvrsupporting

confidence: 83%

“…Mycosporine-glycine belongs to the former, with a maximum absorbance in ultraviolet radiation B (UVB), whereas other more common compounds, including shinorine, porphyra-334, and palythine, belong to the latter and absorb maximally at ultraviolet radiation A (UVA) wavelengths. In phytoplankton, MAAs are inducible by photosynthetically active radiation (PAR) (Carreto et al 1989, Callone et al 2006 and UVR (Neale et al 1998, Shick 2004 as effective sunscreens (Garcia-Pichel 1994). MAA induction reveals that there is wavelength dependence (Hannach & Sigleo 1998) and a dose response (Riegger & Robinson 1997).…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Absorption of Low-Dose Ultraviolet Radiation by Mycosporine-like Amino Acids Induced by the Dinoflagellate <i>Prorocentrum micans</i>

Inamura

Katayama

Taguchi

2017

Plankton Benthos Res

View full text Add to dashboard Cite

Marine dinoflagellates synthesize ultraviolet absorbing compounds, such as mycosporine-like amino acids (MAAs), at high ultraviolet radiation (UVR) to protect from UVR damage. Short-term responses (360 min) of MAAs and absorption of UVR between 310 nm to 360 nm (a ) to UVR were examined in the dinoflagellate Prorocentrum micans to confirm reproducibility even at relatively low doses of UVR (UVB: 0.76 W m −2 in 320-340 nm) and (UVA: 0.84 W m −2 in 340-400 nm). By using a low dose of UVR there was no apparent bleaching of cells and it was possible to normalize MAA concentration with chlorophyll a concentration (Chl a). At the beginning of the exposure experiment, MAAs primarily consisted of shinorine (58.5%), palythine (30.2%), mycosporine-glycine (7.0%), palythene (2.6%), and porphyra-334 (1.7%). Net change in the Chl a specific MAA concentration (δMAAs) was estimated as the difference in Chl a specific MAA concentrations between the experiments with photosynthetically active radiation (PAR in 400-700 nm) and PAR+UVR (320-700 nm). The responses to either PAR or PAR+UVR were composed of two phases: the first was shorter than approximately 90 min, and the second included the subsequent phases. The initial temporal change during the first phase in δMAAs ( ). Although the temporal increase in δMAAs was limited, a possible main route of MAA transformation had mycosporine-glycine and porphyra-334 as the primary precursors of a sequential series of conversions, by which the cells accumulated shinorine and palythene, possibly at the expense of palythine. The increased MAAs enhanced a . The cells appear to achieve MAA transformation with an increase in total MAAs to protect from UVR damage.

show abstract

Section: Response Of Maa Synthesis To Uvrsupporting

confidence: 83%

Section: Response Of Maa Synthesis To Uvrsupporting

confidence: 83%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Absorption of Low-Dose Ultraviolet Radiation by Mycosporine-like Amino Acids Induced by the Dinoflagellate <i>Prorocentrum micans</i>

Inamura

Katayama

Taguchi

2017

Plankton Benthos Res

View full text Add to dashboard Cite

show abstract

“…Laurion & Roy, 2009) and the production of UV-absorbing substances, such as mycosporine-like amino acids (MAAs; e.g. Hernando et al, 2002;Callone et al, 2006;Ingalls et al, 2010), which act as UV 'sunscreens'. For instance, gene regulation of the key enzyme of the flavonoid biosynthetic pathway, chalcone synthase, has been demonstrated to be directly regulated by UV-A (320-400 nm) and blue light (Strid et al, 1994).…”

Section: Introductionmentioning

confidence: 99%

Effects of UV radiation on five marine microphytobenthic Wadden sea diatoms isolated from the Solthörn tidal flat (Lower Saxony, southern North Sea) – Part I: growth and antioxidative defence strategies

Scholz¹,

Rúa²,

Liebezeit³

2014

European Journal of Phycology

View full text Add to dashboard Cite

“…The most studied of these compounds are mycosporinelike amino acids (MAAs), which have been found in many marine and freshwater algae (Karentz et al, 1991;Banaszak, 2003). MAAs have been shown to be an effective protection mechanism (Neale et al, 1998a), and their synthesis was reported for both, natural populations and cultures of phytoplankton (Helbling et al, 1996, Zudaire & Roy, 2001Hernando et al, 2002;Callone et al, 2006). However, the synthesis of MAAs is not a general response, and several species do not show an increase in the content of these compounds even after several weeks of exposure to increased UVR (Villafañe et al, 2000).…”

Section: Introductionmentioning

confidence: 99%

Non enzymatic antioxidant photoprotection against potential UVBR induced damage in an Antarctic diatom (Thalassiosira sp.)

Hernando

Malanga

Puntarulo

et al. 2011

lajar

View full text Add to dashboard Cite

ABSTRACT. In January 1999, unialgal cultures of the diatom Thalassiosira sp., solate from natural phytoplankton assemblages from Potter Cove, Antarctica, were exposed to solar ultraviolet radiation (UVR, 280-400 nm) in order to study the long-term acclimation of this species. Ultraviolet radiation B (UVBR, 280-315 nm) inhibited the growth rate during the first and second days of exposure. No UVBR inhibition was observed on the third day. The initial content of α-tocopherol (13 pmol (10 4 cell)) showed a marked decrease during the exponential growth phase (4 pmol (10 4 cell -1 ) by day 3). The initial content of β-carotene (3 pmol (10 4 cell) -1 ) did not show significant differences over time in cells exposed to UVBR. Two mycosporine-like amino acids (MAAs) were identified: porphyra-334 and shinorine. Cellular concentrations of MAAs increased significantly on days 2 and 3, and exposure of the algae to UVBR significantly enhanced this value. The relative importance of MAAs concentration was significant (P < 0.05) in relation to the α-tocopherol content. A positive correlation was shown between cellular MAAs concentration and growth rate. Our results suggest that photoprotection against UV-induced damage is characterized by short-term consumption of α-tocopherol and longer-term synthesis of MAAs. The UVBR damage/repair ratio during long-term exposure involves the combined action of several endogenous factors within the cell, with MAAs synthesis being the most effective factor related to photoprotection. Keywords: β-carotene, α-tocopherol, growth rate, diatoms, MAAs, photoprotection, Antarctica.Fotoprotección antioxidante no-enzimática contra el potencial daño inducido por UVBR en una diatomea antártica (Thalassiosira sp.) RESUMEN. Durante enero 1999, cultivos unialgales de una diatomea Thalassiosira sp., aislada de poblaciones fitoplanctónicas naturales de Caleta Carlos Potter, Antártida, fueron expuestos a radiación solar ultravioleta (UVR, 280-400 nm) con el objetivo de estudiar su aclimatación a largo plazo. La radiación ultravioleta B (UVBR, 280-315 nm) inhibió la tasa de crecimiento durante el primer y segundo día de exposición. No se observó inhibición por UVBR durante el tercer día. El contenido inicial de α-tocopherol (13 pmol (10 4 cel) -1 ) mostró una marcada disminución durante la fase de crecimiento exponencial (4 pmol (10 4 cel) -1 al día 3). El contenido inicial de β-caroteno (3 pmol (10 4 cel)) no mostró diferencias significativas entre días en células expuestas a UVBR. Se identificaron dos aminoácidos parecidos a micosporina (MAAs), porfira-334 y shinorina. Las concentraciones celulares de MAAs mostraron aumentos significativos en los días 2 y 3, que resultaron mayores cuando las algas fueron expuestas a UVBR. La importancia relativa de la concentración de MAAs fue significativa (P < 0.05) en relación al contenido de α-tocopherol. Se encontró una relación positiva entre la concentración celular de MAAs y la tasa de crecimiento. Estos resultados sugieren que la fotoprotección contra el daño inducido...

show abstract

Biotransformation of mycosporine like amino acids (MAAs) in the toxic dinoflagellate Alexandrium tamarense

Cited by 44 publications

References 29 publications

Absorption of Low-Dose Ultraviolet Radiation by Mycosporine-like Amino Acids Induced by the Dinoflagellate <i>Prorocentrum micans</i>

Absorption of Low-Dose Ultraviolet Radiation by Mycosporine-like Amino Acids Induced by the Dinoflagellate <i>Prorocentrum micans</i>

Effects of UV radiation on five marine microphytobenthic Wadden sea diatoms isolated from the Solthörn tidal flat (Lower Saxony, southern North Sea) – Part I: growth and antioxidative defence strategies

Non enzymatic antioxidant photoprotection against potential UVBR induced damage in an Antarctic diatom (Thalassiosira sp.)

Contact Info

Product

Resources

About