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Ejectisins: tough and tiny polypeptides are a major component of cryptophycean ejectisomes
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Ejectisins: tough and tiny polypeptides are a major component of cryptophycean ejectisomes
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Journal Article
Ejectisins: tough and tiny polypeptides are a major component of cryptophycean ejectisomes
2013
Overview
Fragments of discharged ejectisomes were isolated from two Cryptomonas and a Chroomonas species by detergent treatment followed by Percoll density gradient centrifugation. The fragments withstand high concentrated detergent solutions, reducing agents and freeze-thawing. Disintegration was achieved in 6 M guanidine hydrochloride. Reassembly into long, filamentous, ejectisome-like structures occurred after dialysis. Sodium dodecyl sulfate polyacrylamide gel electrophoresis revealed that the polypeptide patterns of isolated ejectisome fragments and of reconstituted ejectisome-like structures were dominated by polypeptides with relative molecular weights of approximately 6 kDa. The polypeptides were not glycosylated and did not cross-react with antisera directed against recombinant Reb polypeptides which constitute the R-bodies of Caedibacter taeniospiralis. A polyclonal antiserum directed against reconstituted, ejectisome-like filaments cross-reacted with the 6-kDa polypeptides and immunolabeled extruded ejectisome filaments. Twenty amino acid residues, obtained by N-terminal amino acid sequence analysis, matched to polypeptide sequences deduced from cDNA sequences of the cryptophyte Guillardia theta. The term “ejectisins” is introduced for the 6-kDa polypeptides which represent a major component of cryptophycean ejectisomes.
Publisher
Springer-Verlag,Springer Vienna,Springer Nature B.V
