suctorian feeding tentacle

cellstructuremech:suctorian_feeding_tentacle · Appendage · Appendage · Proposed

A tubular cell projection of suctorian ciliates that captures prey at its tip and conveys prey cytoplasm into the cell body. [DOI:10.1083/jcb.25.3.459]

Has part: microtubule (GO:0005874)

UniProt location names: UniProt Consortium, CC BY 4.0. Reference label and route sources.

Components

Component	Type	Part of / acts on	Grounding	Genes	Stoichiometry	Essential	Role
Tubulin	Protein	part of	`InterPro:IPR000217`			UNKNOWN	Builds the microtubule framework. `DOI:10.1016/j.cub.2026.05.071` Figure 5: tubulin immunostaining.
centrin-like proteins	Protein	part of	Reviewed label only (reviewed name; no accession asserted)			UNKNOWN	Localize to the basal collar and tip. `DOI:10.1016/j.cub.2026.05.071` Figure 5: anti-centrin localization.

Taxonomic distribution

NCBITaxon:39462 Suctoria — COMMON: Rudzinska introduces tentacles as the suctorian feeding apparatus. [DOI:10.1083/jcb.25.3.459]

Canonical examples

NCBITaxon:2585839 Prodiscophrya collini — Studied as Podophrya collini; current name verified against NCBI Taxonomy. [DOI:10.1016/j.cub.2026.05.071]
NCBITaxon:1173374 Tokophrya infusionum — Tentacle ultrastructure and feeding were examined by electron microscopy. [DOI:10.1083/jcb.25.3.459]

Functions

prey capture and cytoplasm ingestion — Attaches to prey and channels its cytoplasm into the predator.
- DOI:10.1083/jcb.25.3.459

Mechanism graphs

Transcription and translation support tentacle regeneration (ASSEMBLY)

Regeneration in Prodiscophrya collini.

Subject	Predicate	Object	Evidence
mechanical tentacle removal	triggers	tentacle regeneration	`DOI:10.1016/j.cub.2026.05.071` Figure 4F.
DNA-templated transcription	supports	tentacle regeneration	`DOI:10.1016/j.cub.2026.05.071` Figure 4H.
translation	supports	tentacle regeneration	`DOI:10.1016/j.cub.2026.05.071` Figure 4G.
tentacle regeneration	produces	suctorian feeding tentacle	`DOI:10.1016/j.cub.2026.05.071` Figure 4F.
Tubulin	polymerizes_into	microtubule	`GO:0005874`
microtubule	forms_scaffold_of	suctorian feeding tentacle	`DOI:10.1016/j.cub.2026.05.071` Figure 5.
centrin-like proteins	localizes_to	suctorian feeding tentacle	`DOI:10.1016/j.cub.2026.05.071` Figure 5.

Discussions

CURATION_TODO (OPEN): Resolve the localized centrin-like proteins to exact families. Sequence correspondence and assembly essentiality remain unestablished.
INTERPRETATION (RESOLVED): Require localization before promoting whole-cell proteomics hits to components. Differential abundance in whole cells does not establish tentacle membership.
INTERPRETATION (RESOLVED): Keep the whole feeding projection distinct from its extrusomes and other protist appendages. The record denotes the tubular feeding apparatus, not its dense secretory bodies. Functional analogy alone does not identify it with a dinoflagellate peduncle or haptonema.

Evidence

DOI:10.1083/jcb.25.3.459 Rudzinska 1965; abstract read at PubMed.
DOI:10.1016/j.cub.2026.05.071 Xu et al. 2026; author-hosted PDF read visually, especially Figures 4-5.

Curation history

2026-10-03T10:18:34Z codex · CREATED_RECORD — Scaffolded by scripts/new_record.py
2026-10-03T10:20:40Z codex · EXPANDED_RECORD — Added sourced composition, two authority-verified examples, suctorian scope, feeding function, a pharmacologically supported regeneration graph, and explicit molecular-grounding and structure-boundary decisions.

Source: data/structures/appendage/suctorian_feeding_tentacle.yaml