Linked Life Data

15919674

Source:http://linkedlifedata.com/resource/pubmed/id/15919674

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
7
pubmed:dateCreated
2005-7-26
pubmed:abstractText
The ER body is an endoplasmic reticulum (ER)-derived organelle. Because ER bodies are induced by wounding and methyl jasmonate (MeJA) treatment in rosette leaves, they might be responsible for defense systems. Recently, we isolated nai1 mutants that have no ER body and showed that the levels of PYK10 and PBP1 (PYK10-binding protein 1: At3g16420) were decreased in nai1 mutants. PYK10 is a beta-glucosidase that is localized in ER bodies. PBP1 consists of two repeated regions, each of which is highly homologous to the alpha-chain of jacalin, a carbohydrate-binding protein (lectin) of Artocarpus integriforia. We show in this study that PYK10 has two forms, an active form and an inactive form. The amount of active form increased during incubation of root homogenate. On the other hand, PYK10 separated into soluble and insoluble forms. Active PYK10 molecules mainly occurred as the insoluble form and inactive PYK10 molecules remain soluble. This suggests that the activation of PYK10 needs polymerization. In homogenates of both a pbp1 mutant and the wild type, PYK10 becomes insoluble, while PYK10 activity in pbp1 is only half of that in the wild type. PBP1 has an ability to interact with PYK10. Nonetheless, PBP1 does not bind active PYK10. These results suggest that PBP1 has some effect on the activation of PYK10. In addition, PBP1 was found to have a different subcellular distribution from PYK10. PBP1 may act like a molecular chaperone that facilitates the correct polymerization of PYK10, when tissues are damaged and subcellular structures are destroyed by pests.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Jul
pubmed:issn
0032-0781
pubmed:author
pubmed:issnType
Print
pubmed:volume
46
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
1140-8
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed:year
2005
pubmed:articleTitle
Activation of an ER-body-localized beta-glucosidase via a cytosolic binding partner in damaged tissues of Arabidopsis thaliana.
pubmed:affiliation
Department of Botany, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto, 606-8502 Japan.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't