Linked Life Data

9326614

Source:http://linkedlifedata.com/resource/pubmed/id/9326614

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
21
pubmed:dateCreated
1997-11-24
pubmed:abstractText
The BCL-2 family of proteins is composed of both pro- and antiapoptotic regulators, although its most critical biochemical functions remain uncertain. The structural similarity between the BCL-XL monomer and several ion-pore-forming bacterial toxins has prompted electrophysiologic studies. Both BAX and BCL-2 insert into KCl-loaded vesicles in a pH-dependent fashion and demonstrate macroscopic ion efflux. Release is maximum at approximately pH 4.0 for both proteins; however, BAX demonstrates a broader pH range of activity. Both purified proteins also insert into planar lipid bilayers at pH 4.0. Single-channel recordings revealed a minimal channel conductance for BAX of 22 pS that evolved to channel currents with at least three subconductance levels. The final, apparently stable BAX channel had a conductance of 0.731 nS at pH 4. 0 that changed to 0.329 nS when shifted to pH 7.0 but remained mildly Cl- selective and predominantly open. When BAX-incorporated lipid vesicles were fused to planar lipid bilayers at pH 7.0, a Cl--selective (PK/PCl = 0.3) 1.5-nS channel displaying mild inward rectification was noted. In contrast, BCL-2 formed mildly K+-selective (PK/PCl = 3.9) channels with a most prominent initial conductance of 80 pS that increased to 1.90 nS. Fusion of BCL-2-incorporated lipid vesicles into planar bilayers at pH 7.0 also revealed mild K+ selectivity (PK/PCl = 2.4) with a maximum conductance of 1.08 nS. BAX and BCL-2 each form channels in artificial membranes that have distinct characteristics including ion selectivity, conductance, voltage dependence, and rectification. Thus, one role of these molecules may include pore activity at selected membrane sites.
pubmed:grant
pubmed:commentsCorrections
http://linkedlifedata.com/resource/pubmed/commentcorrection/9326614-1376171, http://linkedlifedata.com/resource/pubmed/commentcorrection/9326614-1384696, http://linkedlifedata.com/resource/pubmed/commentcorrection/9326614-1589020, http://linkedlifedata.com/resource/pubmed/commentcorrection/9326614-1847371, http://linkedlifedata.com/resource/pubmed/commentcorrection/9326614-2250705, http://linkedlifedata.com/resource/pubmed/commentcorrection/9326614-2447282, http://linkedlifedata.com/resource/pubmed/commentcorrection/9326614-7503812, http://linkedlifedata.com/resource/pubmed/commentcorrection/9326614-7521329, http://linkedlifedata.com/resource/pubmed/commentcorrection/9326614-7640294, http://linkedlifedata.com/resource/pubmed/commentcorrection/9326614-7644501, http://linkedlifedata.com/resource/pubmed/commentcorrection/9326614-8031826, http://linkedlifedata.com/resource/pubmed/commentcorrection/9326614-8183370, http://linkedlifedata.com/resource/pubmed/commentcorrection/9326614-8206964, http://linkedlifedata.com/resource/pubmed/commentcorrection/9326614-8244956, http://linkedlifedata.com/resource/pubmed/commentcorrection/9326614-8261449, http://linkedlifedata.com/resource/pubmed/commentcorrection/9326614-8358790, http://linkedlifedata.com/resource/pubmed/commentcorrection/9326614-8402648, http://linkedlifedata.com/resource/pubmed/commentcorrection/9326614-8496157, http://linkedlifedata.com/resource/pubmed/commentcorrection/9326614-8521816, http://linkedlifedata.com/resource/pubmed/commentcorrection/9326614-8528768, http://linkedlifedata.com/resource/pubmed/commentcorrection/9326614-8596636, http://linkedlifedata.com/resource/pubmed/commentcorrection/9326614-8617712, http://linkedlifedata.com/resource/pubmed/commentcorrection/9326614-8621473, http://linkedlifedata.com/resource/pubmed/commentcorrection/9326614-8637709, http://linkedlifedata.com/resource/pubmed/commentcorrection/9326614-8663439, http://linkedlifedata.com/resource/pubmed/commentcorrection/9326614-8666911, http://linkedlifedata.com/resource/pubmed/commentcorrection/9326614-8689682, http://linkedlifedata.com/resource/pubmed/commentcorrection/9326614-8692274, http://linkedlifedata.com/resource/pubmed/commentcorrection/9326614-8791486, http://linkedlifedata.com/resource/pubmed/commentcorrection/9326614-8861942, http://linkedlifedata.com/resource/pubmed/commentcorrection/9326614-8918887, http://linkedlifedata.com/resource/pubmed/commentcorrection/9326614-8962091, http://linkedlifedata.com/resource/pubmed/commentcorrection/9326614-9002522, http://linkedlifedata.com/resource/pubmed/commentcorrection/9326614-9020082, http://linkedlifedata.com/resource/pubmed/commentcorrection/9326614-9144199, http://linkedlifedata.com/resource/pubmed/commentcorrection/9326614-9219694, http://linkedlifedata.com/resource/pubmed/commentcorrection/9326614-9241272
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Oct
pubmed:issn
0027-8424
pubmed:author
pubmed:issnType
Print
pubmed:day
14
pubmed:volume
94
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
11357-62
pubmed:dateRevised
2009-11-18
pubmed:meshHeading
pubmed:year
1997
pubmed:articleTitle
Comparison of the ion channel characteristics of proapoptotic BAX and antiapoptotic BCL-2.
pubmed:affiliation
Department of Medicine, Washington University School of Medicine, 660 South Euclid, Box 8022, St. Louis, MO 63110, USA.
pubmed:publicationType
Journal Article, Comparative Study, Research Support, U.S. Gov't, P.H.S., Research Support, Non-U.S. Gov't