A novel species of the marine cyanobacterium Acaryochloris with a unique pigment content and lifestyle
All characterized members of the ubiquitous genus Acaryochloris share the unique property of containing large amounts of chlorophyll (Chl) d , a pigment exhibiting a red absorption maximum strongly shifted towards infrared compared to Chl a . Chl d is the major pigment in these organisms and is nota...
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Published in | Scientific reports Vol. 8; no. 1; pp. 9142 - 13 |
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Main Authors | , , , , , , , , , , , , , , |
Format | Journal Article |
Language | English |
Published |
London
Nature Publishing Group UK
14.06.2018
Nature Publishing Group |
Subjects | |
Online Access | Get full text |
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Summary: | All characterized members of the ubiquitous genus
Acaryochloris
share the unique property of containing large amounts of chlorophyll (Chl)
d
, a pigment exhibiting a red absorption maximum strongly shifted towards infrared compared to Chl
a
. Chl
d
is the major pigment in these organisms and is notably bound to antenna proteins structurally similar to those of
Prochloron
,
Prochlorothrix
and
Prochlorococcus
, the only three cyanobacteria known so far to contain mono- or divinyl-Chl
a
and
b
as major pigments and to lack phycobilisomes. Here, we describe RCC1774, a strain isolated from the foreshore near Roscoff (France). It is phylogenetically related to members of the
Acaryochloris
genus but completely lacks Chl
d
. Instead, it possesses monovinyl-Chl
a
and
b
at a
b/a
molar ratio of 0.16, similar to that in
Prochloron
and
Prochlorothrix
. It differs from the latter by the presence of phycocyanin and a vestigial allophycocyanin energetically coupled to photosystems. Genome sequencing confirmed the presence of phycobiliprotein and Chl
b
synthesis genes. Based on its phylogeny, ultrastructural characteristics and unique pigment suite, we describe RCC1774 as a novel species that we name
Acaryochloris thomasi
. Its very unusual pigment content compared to other
Acaryochloris
spp. is likely related to its specific lifestyle. |
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Bibliography: | ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
ISSN: | 2045-2322 2045-2322 |
DOI: | 10.1038/s41598-018-27542-7 |