Linked Life Data

3311049

Source:http://linkedlifedata.com/resource/pubmed/id/3311049

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
19
pubmed:dateCreated
1987-11-4
pubmed:abstractText
An aminopeptidase and four hemoglobin-degrading acid proteases have been isolated from cloned strains of chloroquine-sensitive and chloroquine-resistant Plasmodium falciparum. Amino-peptidases from both strains showed similar properties including molecular weights of 63,000 and non-competitive inhibition by chloroquine; Ki = 535 and 410 microM for enzymes from the sensitive and resistant strains respectively. The acid proteases from the chloroquine-sensitive strain included a low molecular weight enzyme in the soluble fraction (protease S), an enzyme weakly associated with membrane (protease M2), and two enzymes strongly associated with membrane (proteases M3 and M4). The acid proteases from the chloroquine-resistant strain included protease S, protease M2, a second enzyme weakly associated with membrane (protease M1), and protease M3. All of the acid proteases were inhibited by ferriprotoporphyrin IX and by the chloroquine-ferriprotoporphyrin IX complex, I50 = 5-25 microM. The data were consistent with a model for chloroquine action wherein chloroquine acts to divert ferriprotoporphyrin IX from sequestration into malarial pigment, leaving ferriprotoporphyrin IX (or its chloroquine complex) to interfere with digestion of host cytosol by inhibiting hemoglobin-degrading proteases. However, the similarities among the proteases from chloroquine-sensitive and chloroquine-resistant strains of parasites suggest that chloroquine resistance does not result from changes in parasite proteases.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Oct
pubmed:issn
0006-2952
pubmed:author
pubmed:issnType
Print
pubmed:day
1
pubmed:volume
36
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
3285-91
pubmed:dateRevised
2009-11-19
pubmed:meshHeading
pubmed:year
1987
pubmed:articleTitle
Comparison of proteases from chloroquine-sensitive and chloroquine-resistant strains of Plasmodium falciparum.
pubmed:affiliation
Department of Biochemistry, University of New Mexico, School of Medicine, Albuquerque 87131.
pubmed:publicationType
Journal Article, Comparative Study, Research Support, U.S. Gov't, P.H.S.