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Plant Signal Behav. 2012 Dec;7(12):1724-6. doi: 10.4161/psb.22452. Epub 2012 Oct 16.

Interactions among tobacco sieve element occlusion (SEO) proteins.

Author information

1
Fraunhofer Institute for Molecular Biology and Applied Ecology, Münster, Germany.

Abstract

Angiosperms transport their photoassimilates through sieve tubes, which comprise longitudinally-connected sieve elements. In dicots and also some monocots, the sieve elements contain parietal structural proteins known as phloem proteins or P-proteins. Following injury, P proteins disperse and accumulate as viscous plugs at the sieve plates to prevent the loss of valuable transport sugars. Tobacco (Nicotiana tabacum) P-proteins are multimeric complexes comprising subunits encoded by members of the SEO (sieve element occlusion) gene family. The existence of multiple subunits suggests that P-protein assembly involves interactions between SEO proteins, but this process is largely uncharacterized and it is unclear whether the different subunits perform unique roles or are redundant. We therefore extended our analysis of the tobacco P-proteins NtSEO1 and NtSEO2 to investigate potential interactions between them, and found that both proteins can form homomeric and heteromeric complexes in planta.

KEYWORDS:

BiFC; P-protein; forisome; interaction; phloem; sieve element occlusion; wound response

PMID:
23072990
PMCID:
PMC3578920
DOI:
10.4161/psb.22452
[Indexed for MEDLINE]
Free PMC Article
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