Elastic proteins in the flight muscle of Manduca sexta

Chen Ching Yuan, Weikang Ma, Peter Schemmel, Yu Shu Cheng, Jiangmin Liu, George Tsaprailis, Samuel Feldman, Agnes Ayme Southgate, Thomas C. Irving

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

The flight muscles (DLM1) of the Hawkmoth, Manduca sexta are synchronous, requiring a neural spike for each contraction. Stress/strain curves of skinned DLM1 showed hysteresis indicating the presence of titin-like elastic proteins. Projectin and kettin are titin-like proteins previously identified in Lethocerus and Drosophila flight muscles. Analysis of Manduca muscles with 1% SDS-agarose gels and western blots showed two bands near 1 MDa that cross-reacted with antibodies to Drosophila projectin. Antibodies to Drosophila kettin cross-reacted to bands at ∼500 and ∼700 kDa, but also to bands at ∼1.6 and ∼2.1 MDa, that had not been previously observed in insect flight muscles. Mass spectrometry identified the 2.1 MDa protein as a product of the Sallimus (sls) gene. Analysis of the gene sequence showed that all 4 putative Sallimus and kettin isoforms could be explained as products of alternative splicing of the single sls gene. Both projectin and sallimus isoforms were expressed to higher levels in ventrally located DLM1 subunits, primarily responsible for active work production, as compared to dorsally located subunits, which may act as damped springs. The different expression levels of the 2 projectin isoforms and 4 sallimus/kettin isoforms may be adaptations to the specific requirements of individual muscle subunits.

Original languageEnglish (US)
Pages (from-to)16-27
Number of pages12
JournalArchives of Biochemistry and Biophysics
Volume568
DOIs
StatePublished - Feb 15 2015

Fingerprint

Manduca
Muscle
Protein Isoforms
Muscles
Connectin
Drosophila
Genes
Proteins
Antibodies
Alternative Splicing
Stress-strain curves
Sepharose
Mass spectrometry
Sequence Analysis
Insects
Hysteresis
Mass Spectrometry
Western Blotting
Gels
projectin

Keywords

  • Elastic proteins
  • Insect flight muscle
  • Passive tension

ASJC Scopus subject areas

  • Biochemistry
  • Biophysics
  • Molecular Biology

Cite this

Yuan, C. C., Ma, W., Schemmel, P., Cheng, Y. S., Liu, J., Tsaprailis, G., ... Irving, T. C. (2015). Elastic proteins in the flight muscle of Manduca sexta. Archives of Biochemistry and Biophysics, 568, 16-27. https://doi.org/10.1016/j.abb.2014.12.033

Elastic proteins in the flight muscle of Manduca sexta. / Yuan, Chen Ching; Ma, Weikang; Schemmel, Peter; Cheng, Yu Shu; Liu, Jiangmin; Tsaprailis, George; Feldman, Samuel; Ayme Southgate, Agnes; Irving, Thomas C.

In: Archives of Biochemistry and Biophysics, Vol. 568, 15.02.2015, p. 16-27.

Research output: Contribution to journalArticle

Yuan, CC, Ma, W, Schemmel, P, Cheng, YS, Liu, J, Tsaprailis, G, Feldman, S, Ayme Southgate, A & Irving, TC 2015, 'Elastic proteins in the flight muscle of Manduca sexta', Archives of Biochemistry and Biophysics, vol. 568, pp. 16-27. https://doi.org/10.1016/j.abb.2014.12.033
Yuan, Chen Ching ; Ma, Weikang ; Schemmel, Peter ; Cheng, Yu Shu ; Liu, Jiangmin ; Tsaprailis, George ; Feldman, Samuel ; Ayme Southgate, Agnes ; Irving, Thomas C. / Elastic proteins in the flight muscle of Manduca sexta. In: Archives of Biochemistry and Biophysics. 2015 ; Vol. 568. pp. 16-27.
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