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@ARTICLE{Obermann:329083,
author = {Obermann, H. and Mandelkow, E. M. and Lange, G. and
Mandelkow, E.},
title = {{M}icrotubule oscillations. {R}ole of nucleation and
microtubule number concentration},
journal = {The journal of biological chemistry},
volume = {265},
number = {8},
issn = {0021-9258},
address = {Bethesda, Md.},
publisher = {Soc.},
reportid = {PUBDB-2017-05721},
pages = {4382-4388},
year = {1990},
note = {HASYLAB},
abstract = {Microtubules are capable of performing synchronized
oscillations of assembly and disassembly which has been
explained by reaction mechanisms involving tubulin subunits,
oligomers, microtubules, and GTP. Here we address the
question of how microtubule nucleation or their number
concentration affects the oscillations. Assembly itself
requires a critical protein concentration (Cc), but
oscillations require in addition a critical microtubule
number concentration (CMT). In spontaneous assembly this can
be achieved with protein concentrations Cos well above the
critical concentration Cc because this enhances the
efficiency of nucleation. Seeding with microtubules can
either generate oscillations or suppress them, depending on
how the seeds alter the effective microtubule number
concentration. The relative influence of microtubule number
and total protein concentrations can be varied by the rate
at which assembly conditions are induced (e.g. by a
temperature rise): Fast T-jumps induce oscillations because
of efficient nucleation, slow ones do not. Oscillations
become damped for several reasons. One is the consumption of
GTP, the second is a decrease in microtubule number, and the
third is that the ratio of microtubules in the two phases
(growth-competent and shrinkage-competent) approach a steady
state value. This ratio can be perturbed, and the
oscillations restarted, by a cold shock, addition of seeds,
addition of GTP, or fragmentation. Each of these is
equivalent to a change in the effective microtubule number
concentration.},
keywords = {Macromolecular Substances (NLM Chemicals) / Microtubule
Proteins (NLM Chemicals) / Tubulin (NLM Chemicals) /
Guanosine Diphosphate (NLM Chemicals) / Guanosine
Triphosphate (NLM Chemicals)},
cin = {DESY(-2012)},
ddc = {570},
cid = {$I:(DE-H253)DESY_-2012_-20170516$},
pnm = {899 - ohne Topic (POF3-899)},
pid = {G:(DE-HGF)POF3-899},
experiment = {EXP:(DE-MLZ)NOSPEC-20140101},
typ = {PUB:(DE-HGF)16},
pubmed = {pmid:2307670},
url = {https://bib-pubdb1.desy.de/record/329083},
}