Linked Life Data

20077462

Source:http://linkedlifedata.com/resource/pubmed/id/20077462

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
2
pubmed:dateCreated
2010-2-3
pubmed:abstractText
Sigma-2 (sigma(2)) binding sites are an emerging target for anti-neoplastic agents due to the strong apoptotic effect exhibited by sigma(2) agonists in vitro and the overexpression of these sites in tumor cells. Nonetheless, no sigma(2) receptor protein has been identified. Affinity chromatography using the high-affinity sigma(2) ligand PB28 and human SK-N-SH neuroblastoma cells was previously utilized to identify sigma(2) ligand binding proteins, specifically histones H1, H2A, H2B, and H3.3a. To rationalize this finding, homology modeling and automated docking studies were employed to probe intermolecular interactions between PB28 and human nucleosomal proteins. These studies predicted interaction of PB28 with the H2A/H2B dimer at a series of sites previously found to be implicated in chromatin compaction and nucleosomal assembly. To experimentally verify this prediction, a competitive binding assay was performed on the reconstituted H2A/H2B dimer using [(3)H]PB28 as radioligand, and an IC(50) value of 0.50 nM was determined for PB28 binding. In addition, [(3)H]PB28 was found to accumulate with up to a fivefold excess in nuclear fractions over cytosolic fractions of SK-N-SH and MCF7 cells, indicating that PB28 is capable of entering the nucleus to interact with histone proteins. In conjunction with computational results, these data suggest that PB28 may exert its cytotoxic effect through direct interaction with nuclear material.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Feb
pubmed:issn
1860-7187
pubmed:author
pubmed:issnType
Electronic
pubmed:day
1
pubmed:volume
5
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
268-73
pubmed:meshHeading
pubmed:year
2010
pubmed:articleTitle
Interaction of the sigma(2) receptor ligand PB28 with the human nucleosome: computational and experimental probes of interaction with the H2A/H2B dimer.
pubmed:affiliation
Dipartimento Farmacochimico, Università degli Studi di Bari, Via Orabona 4, 70125 Bari, Italy. abate@farmchim.uniba.it
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't, Research Support, N.I.H., Extramural