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Predicate | Object |
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rdf:type | |
lifeskim:mentions | |
pubmed:issue |
1
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pubmed:dateCreated |
1989-10-20
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pubmed:abstractText |
The effects of poly(L-aspartic acid) (PLAA) on microtubule assembly and microtubule-associated protein (MAP) 2-actin interaction were examined in vitro. PLAA inhibited assembly of rat brain microtubules and induced rapid disassembly of already formed microtubules. Inhibition was stronger by PLAA with a high molecular weight than that by low molecular weight. The ratios of 47 kDa PLAA to microtubule proteins causing 50% inhibition of the assembly and disassembly were 0.015 and 0.04 (w/w), respectively. Both MAP 1 and MAP 2 were bound to a PLAA-Sepharose 4B affinity column, while tubulin was not retained by the column. PLAA caused selective dissociation of MAP 1 and MAP 2 from microtubules polymerized by taxol. It is therefore concluded that PLAA interacts specifically with MAPs. PLAA also inhibited the MAP 2 induced cross-linking of actin filaments, showing an almost complete inhibition at a PLAA to MAP 2 ratio of 1:5,000 (w/w). Binding experiments of PLAA with digested MAP 2 by chymotrypsin using affinity chromatography and sedimentation experiments showed that PLAA was preferentially bound to a 35 kDa fragment which includes the microtubule- and actin-binding domain of the MAP 2 molecule. These results suggest that PLAA suppressed the functions of MAP 2 through a domain which is located in the 35 kDa fragment.
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pubmed:language |
eng
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pubmed:journal | |
pubmed:citationSubset |
IM
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pubmed:chemical |
http://linkedlifedata.com/resource/pubmed/chemical/Actins,
http://linkedlifedata.com/resource/pubmed/chemical/Chymotrypsin,
http://linkedlifedata.com/resource/pubmed/chemical/Microtubule-Associated Proteins,
http://linkedlifedata.com/resource/pubmed/chemical/Peptide Fragments,
http://linkedlifedata.com/resource/pubmed/chemical/Peptides,
http://linkedlifedata.com/resource/pubmed/chemical/Tubulin,
http://linkedlifedata.com/resource/pubmed/chemical/polyaspartate
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pubmed:status |
MEDLINE
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pubmed:month |
Jul
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pubmed:issn |
0021-924X
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pubmed:author | |
pubmed:issnType |
Print
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pubmed:volume |
106
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pubmed:owner |
NLM
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pubmed:authorsComplete |
Y
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pubmed:pagination |
93-7
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pubmed:dateRevised |
2008-11-21
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pubmed:meshHeading |
pubmed-meshheading:2777757-Actins,
pubmed-meshheading:2777757-Animals,
pubmed-meshheading:2777757-Brain,
pubmed-meshheading:2777757-Chemical Phenomena,
pubmed-meshheading:2777757-Chemistry,
pubmed-meshheading:2777757-Chymotrypsin,
pubmed-meshheading:2777757-Microtubule-Associated Proteins,
pubmed-meshheading:2777757-Microtubules,
pubmed-meshheading:2777757-Peptide Fragments,
pubmed-meshheading:2777757-Peptides,
pubmed-meshheading:2777757-Protein Binding,
pubmed-meshheading:2777757-Rats,
pubmed-meshheading:2777757-Tubulin
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pubmed:year |
1989
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pubmed:articleTitle |
Inhibitory effects of poly(L-aspartic acid) on the assembly of brain microtubules and the interaction of microtubule-associated protein 2 with F-actin in vitro.
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pubmed:affiliation |
Department of Functional Polymer Science, Faculty of Textile Science and Technology, Shinshu University, Nagano.
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pubmed:publicationType |
Journal Article
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