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. 1982 Jun 1;93(3):615–631. doi: 10.1083/jcb.93.3.615

Synthesis, transport, and utilization of specific flagellar proteins during flagellar regeneration in Chlamydomonas

PMCID: PMC2112125  PMID: 7118994

Abstract

We labeled gametes of Chlamydomonas with 10-min pulses of 35SO4(-2) before and at various times after deflagellation, and isolated whole cells and flagella immediately after the pulse. The labeled proteins were separated by one- or two-dimensional gel electrophoresis, and the amount of isotope incorporated into specific proteins was determined. Individual proteins were identified with particular structures by correlating missing axonemal polypeptides with ultrastructural defects in paralyzed mutants, or by polypeptide analysis of flagellar fractions. Synthesis of most flagellar proteins appeared to be coordinately induced after flagellar amputation. The rate of synthesis for most quantified proteins increased at least 4- to 10-fold after deflagellation. The kinetics of synthesis of proteins contained together within a structure (e.g., the radial spoke proteins [RSP] ) were frequently similar; however, the kinetics of synthesis of proteins contained in different structures (e.g., RSP vs. alpha- and beta- tubulins) were different. Most newly synthesized flagellar proteins were rapidly transported into the flagellum with kinetics reflecting the rate of growth of the organelle; exceptions included a central tubule complex protein (CT1) and an actinlike component, both of which appeared to be supplied almost entirely from pre-existing, unlabeled pools. Isotope dilution experiments showed that, for most quantified axonemal proteins, a minimum of 35-40% of the polypeptide chains used in assembling a new axoneme was synthesized during regeneration; these proteins appeared to have predeflagellation pools of approximately the same size relative to their stoichiometries in the axoneme. In contrast, CT1 and the actinlike protein had comparatively large pools.

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Selected References

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