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Cell-free synthesis of myelin basic proteins in normal and dysmyelinating mutant mice.

Abstract：

:Total polyribosomes were isolated from the brains of 16-20 day C57BL/6 mice, four neurological mutants (qk/qk, shi/shi, mld/mld, and jp/Y), and four heterozygote or littermate controls (qk/+, shil/+, mld, and jp littermates) and translated in a homologous, cell-free system. No differences were observed among the nine genotypes in either the yield of polysomes (32.2 +/- 0.6 A260/g brain) or in the incorporation of [35S]methionine into trichloroacetic acid-precipitable protein. However, when the four myelin basic proteins (BPs) were isolated from the translation mixtures little incorporation of [35S]methionine into the BPs was noted in those assays directed by polysomes from mld/mld or from shi/shi animals. Compared with C57BL/6 polysomes, mld littermate and shi/+ polysomes incorporated approximately half the levels of label into the four BPs while qk/+ and qk/qk incorporated normal and close-to-normal levels. Polysomes from jp littermates and jp/Y brains synthesized 66% and less than 15% of the levels of the 14K BP compared with C57BL/6 polysomes. Incorporation of label into the other three BPs was normal with jp littermate polysomes and about half the control levels with jp/Y polysomes. The data indicate that shi/shi and mld/mld mutants either produce altered BPs not recognized by our antibody or synthesize very low levels of BP. The data provide additional support for the notion that the qk/qk mutant synthesizes much higher levels of MBP than are incorporated into myelin. They also indicate that in the jimpy mutant the synthesis of the four BPs is affected to differing extents; thus, the mutant cannot be easily characterized as either an "assembly" or "synthesis" defect.

journal_name

J Neurochem

journal_title

Journal of neurochemistry

authors

Campagnoni AT,Campagnoni CW,Bourre JM,Jacque C,Baumann N

doi

10.1111/j.1471-4159.1984.tb02744.x

subject

Has Abstract

pub_date

1984-03-01 00:00:00

pages

733-9

issue

3

eissn

0022-3042

issn

1471-4159

journal_volume

42

pub_type

杂志文章

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