Differential distribution of alpha-tubulin isotypes in Euplotes eurystomus determined by confocal immunofluorescence microscopy.

Abstract:

:Detergent permeabilized Euplotes eurystomus (a fresh water hypotrichous ciliate) was reacted with monoclonal and polyclonal antibodies specific for either detyrosinated or tyrosinated alpha-tubulin (Glu- or Tyr-tubulin). The isolated cytoskeleton-nuclear complex was examined by Western immunoblotting and by immunofluorescent and electron microscopic methods. Both Glu- and Tyr-tubulins were detected by immunoblot analysis. Immunofluorescent microscopy indicated that the alpha-tubulin isotypes are concentrated in different regions of permeabilized cells: Glu-tubulin is located primarily in cirri, membranelles, and surrounding the macro- and micronuclei. Tyr-tubulin is principally at the bases of cirri and membranelles. This differential distribution of alpha-tubulin isotypes is discussed in terms of current concepts concerning the correlation of tubulin post-translational modifications to microtubule stability. Confocal immunofluorescent imaging was of critical importance in clearly differentiating the Glu-tubulin isotype surrounding the macro- and micronuclei from a brilliantly fluorescent environment originating from cytoskeletal structures. In conjunction with conventional and stereo-electron microscopy, confocal optical microscopy provided convincing evidence for a "basket" of microtubules surrounding both nuclei.

journal_name

Biol Cell

journal_title

Biology of the cell

authors

Olins DE,Olins AL,Robert-Nicoud M,Jovin TM,Wehland J,Weber K

subject

Has Abstract

pub_date

1989-01-01 00:00:00

pages

235-46

issue

3

eissn

0248-4900

issn

1768-322X

pii

0248-4900(89)90176-7

journal_volume

66

pub_type

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