Conformation transitions of eukaryotic polyribosomes during multi-round translation.

Abstract:

:Using sedimentation and cryo electron tomography techniques, the conformations of eukaryotic polyribosomes formed in a long-term cell-free translation system were analyzed over all the active system lifetime (20-30 translation rounds during 6-8 h in wheat germ extract at 25°C). Three distinct types of the conformations were observed: (i) circular polyribosomes, varying from ring-shaped forms to circles collapsed into double rows, (ii) linear polyribosomes, tending to acquire planar zigzag-like forms and (iii) densely packed 3D helices. At the start, during the first two rounds of translation mostly the circular (ring-shaped and double-row) polyribosomes and the linear (free-shaped and zigzag-like) polyribosomes were formed ('juvenile phase'). The progressive loading of the polyribosomes with translating ribosomes induced the opening of the circular polyribosomes and the transformation of a major part of the linear polyribosomes into the dense 3D helices ('transitional phase'). After 2 h from the beginning (about 8-10 rounds of translation) this compact form of polyribosomes became predominant, whereas the circular and linear polyribosome fractions together contained less than half of polysomal ribosomes ('steady-state phase'). The latter proportions did not change for several hours. Functional tests showed a reduced translational activity in the fraction of the 3D helical polyribosomes.

journal_name

Nucleic Acids Res

journal_title

Nucleic acids research

authors

Afonina ZA,Myasnikov AG,Shirokov VA,Klaholz BP,Spirin AS

doi

10.1093/nar/gku1270

subject

Has Abstract

pub_date

2015-01-01 00:00:00

pages

618-28

issue

1

eissn

0305-1048

issn

1362-4962

pii

gku1270

journal_volume

43

pub_type

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