The pleiotropic effects of ftn2 and ftn6 mutations in cyanobacterium Synechococcus sp. PCC 7942 : An ultrastructural studyстатья
Статья опубликована в высокорейтинговом журнале
Информация о цитировании статьи получена из
Web of Science,
Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 14 сентября 2013 г.
Аннотация:Two cell division mutants (Ftn2 and Ftn6) of the
cyanobacterium Synechococcus sp. PCC 7942 were studied
using scanning electron microscopy and transmission electron
microscopy methods. This included negative staining and
ultrathin section analysis. Different morphological and ultra-
structural features of mutant cells were identified. Ftn2 and
Ftn6 mutants exhibited particularly elongated cells character-
ized by significantly changed shape in comparison with the
wild type. There was irregular bending, curving, spiralization,
and bulges as well as cell branching. Elongated mutant cells
were able to initiate cytokinesis simultaneously in several
division sites which were localized irregularly along the cell.
Damaged rigidity of the cell wall was typical ofmany cells for
both mutants. Thylakoids of mutants showed modified ar-
rangement and ultrastructural organization. Carboxysome-
like structures without a shell and/or without accurate polyhe-
dral packing protein particles were often detected in the
mutants. However, in the case of Ftn2 and Ftn6, the average
number of carboxysomes per section was less than in the wild
type by a factor of 4 and 2, respectively. These multiple
morphological and ultrastructural changes in mutant cells
evinced pleiotropic responses which were induced by muta-
tions in cell division genes ftn2 and ftn6. Ultrastructural ab-
normalities of Ftn2 and Ftn6 mutants were consistent with
differences in their proteomes. These results could support the
significance of FTN2 and FTN6 proteins for both cyanobac-
terial cell division and cellular physiology.