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Title: Maximal force characteristics of the Ca2+-powered actuator of vorticella convallaria
Authors: Ryu, S.
Lang, M.J.
Matsudaira, P. 
Issue Date: 5-Sep-2012
Citation: Ryu, S., Lang, M.J., Matsudaira, P. (2012-09-05). Maximal force characteristics of the Ca2+-powered actuator of vorticella convallaria. Biophysical Journal 103 (5) : 860-867. ScholarBank@NUS Repository.
Abstract: The millisecond stalk contraction of the sessile ciliate Vorticella convallaria is powered by energy from Ca2+ binding to generate contractile forces of ∼10 nN. Its contractile organelle, the spasmoneme, generates higher contractile force under increased stall resistances. By applying viscous drag force to contracting V. convallaria in a microfluidic channel, we observed that the mechanical force and work of the spasmoneme depended on the stalk length, i.e.; the maximum tension (150-350 nN) and work linearly depended on the stalk length (∼2.5 nN and ∼30 fJ per 1 μm of the stalk). This stalk-length dependency suggests that motor units of the spasmoneme may be organized in such a way that the mechanical force and work of each unit cumulate in series along the spasmoneme. © 2012 Biophysical Society.
Source Title: Biophysical Journal
ISSN: 00063495
DOI: 10.1016/j.bpj.2012.07.038
Appears in Collections:Staff Publications

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