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2017 ; 9
(2
): ä Nephropedia Template TP
gab.com Text
Twit Text FOAVip
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English Wikipedia
Microscopic Characterization of the Brazilian Giant Samba Virus
#MMPMID28216551
Schrad JR
; Young EJ
; Abrahão JS
; Cortines JR
; Parent KN
Viruses
2017[Feb]; 9
(2
): ä PMID28216551
show ga
Prior to the discovery of the mimivirus in 2003, viruses were thought to be
physically small and genetically simple. Mimivirus, with its ~750-nm particle
size and its ~1.2-Mbp genome, shattered these notions and changed what it meant
to be a virus. Since this discovery, the isolation and characterization of giant
viruses has exploded. One of the more recently discovered giant viruses, Samba
virus, is a Mimivirus that was isolated from the Rio Negro in the Brazilian
Amazon. Initial characterization of Samba has revealed some structural
information, although the preparation techniques used are prone to the generation
of structural artifacts. To generate more native-like structural information for
Samba, we analyzed the virus through cryo-electron microscopy, cryo-electron
tomography, scanning electron microscopy, and fluorescence microscopy. These
microscopy techniques demonstrated that Samba particles have a capsid diameter of
~527 nm and a fiber length of ~155 nm, making Samba the largest Mimivirus yet
characterized. We also compared Samba to a fiberless mimivirus variant. Samba
particles, unlike those of mimivirus, do not appear to be rigid, and
quasi-icosahedral, although the two viruses share many common features, including
a multi-layered capsid and an asymmetric nucleocapsid, which may be common
amongst the Mimiviruses.