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Photosome membranes merge and organize tending towards rhombohedral symmetry when light is emitted.

Abstract：

:Polynoid worm elytra emit light when mechanically or electrically stimulated. Specialized cells, the photocytes, contain light emitting machineries, the photosomes. Successive stimulations induce light intensity variations and show a coupling within and between photosomes. Here, we describe, using electron tomography of cryo-substituted elytra and freeze-fracturing, the structural transition associated to light emission: undulating tubules come closer, organize and their number forming photosomes increases. Two repeating undulating tubules in opposite phase compose the photosome. Undulations are located on three hexagonal layers that regularly repeat and are equally displaced, in x y and z. The tubule membranes within layers merge giving rise to rings that tend to obey to quasi-rhombohedral symmetry. Merging may result either from close-association, hemifusion (one leaflet fusion) or from fusion (two leaflets fusion). Although the resolution of tomograms is not sufficient to distinguish these three cases, freeze-fracturing shows that hemifusion is a frequent process that leads to an reversible anastomosed membrane complex favoring communications, appearing as a major coupling factor of photosome light emission.

journal_name

J Struct Biol

journal_title

Journal of structural biology

authors

Ouldali M,Maury V,Nicolas G,Lepault J

doi

10.1016/j.jsb.2017.12.001

subject

Has Abstract

pub_date

2018-04-01 00:00:00

pages

35-41

issue

1

eissn

1047-8477

issn

1095-8657

pii

S1047-8477(17)30213-7

journal_volume

202

pub_type

杂志文章

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