Linked Life Data

10743611

Source:http://linkedlifedata.com/resource/pubmed/id/10743611

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
1
pubmed:dateCreated
2000-5-10
pubmed:databankReference
pubmed:abstractText
Complex II of adult Ascaris suum muscle exhibits high fumarate reductase (FRD) activity and plays a key role in anaerobic electron-transport during adaptation to their microaerobic habitat. In contrast, larval (L2) complex II shows a much lower FRD activity than the adult enzyme, and functions as succinate dehydrogenase (SDH) in aerobic respiration. We have reported the stage-specific isoforms of complex II in A. suum mitochondria, and showed that at least the flavoprotein subunit (Fp) and the small subunit of cytochrome b (cybS) of the larval complex II differ from those of adult. In the present study, complete cDNAs for the iron-sulfur subunit (Ip) of complex II, which with Fp forms the catalytic portion of complex II, have been cloned and sequenced from anaerobic adult A. suum, and the free-living nematode, Caenorhabditis elegans. The amino acid sequences of the Ip subunits of these two nematodes are similar, particularly around the three cysteine-rich regions that are thought to comprise the iron-sulfur clusters of the enzyme. The Ip from A. suum larvae was also characterized because Northern hybridization showed that the adult Ip is also expressed in L2. The Ip of larval complex II was recognized by the antibody against adult Ip, and was indistinguishable from the adult Ip by peptide mapping. The N-terminal 42 amino acid sequence of Ip in the larval complex II purified by DEAE-cellulofine column chromatography was identical to that of the mature form of the adult Ip. Furthermore, the amino acid composition of larval Ip determined by micro-analysis on a PVDF membrane is almost the same as that of adult Ip. These results, together with the fact, that homology probing by RT-PCR, using degenerated primers, failed to find a larval-specific Ip, suggest that the two different stage-specific forms of the A. suum complex II share a common Ip subunit, even though the adult enzyme functions as a FRD, while larval enzyme acts as an SDH.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Feb
pubmed:issn
0166-6851
pubmed:author
pubmed:issnType
Print
pubmed:day
25
pubmed:volume
106
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
63-76
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed-meshheading:10743611-Amino Acid Sequence, pubmed-meshheading:10743611-Animals, pubmed-meshheading:10743611-Ascaris suum, pubmed-meshheading:10743611-Base Sequence, pubmed-meshheading:10743611-Blotting, Northern, pubmed-meshheading:10743611-Blotting, Western, pubmed-meshheading:10743611-Caenorhabditis elegans, pubmed-meshheading:10743611-Chromatography, Ion Exchange, pubmed-meshheading:10743611-Cloning, Molecular, pubmed-meshheading:10743611-DNA, Complementary, pubmed-meshheading:10743611-Electron Transport Complex II, pubmed-meshheading:10743611-Iron-Sulfur Proteins, pubmed-meshheading:10743611-Isoenzymes, pubmed-meshheading:10743611-Larva, pubmed-meshheading:10743611-Molecular Sequence Data, pubmed-meshheading:10743611-Multienzyme Complexes, pubmed-meshheading:10743611-Oxidoreductases, pubmed-meshheading:10743611-RNA, Helminth, pubmed-meshheading:10743611-Sequence Alignment, pubmed-meshheading:10743611-Sequence Homology, Amino Acid, pubmed-meshheading:10743611-Succinate Dehydrogenase
pubmed:year
2000
pubmed:articleTitle
Stage-specific isoforms of Ascaris suum complex. II: The fumarate reductase of the parasitic adult and the succinate dehydrogenase of free-living larvae share a common iron-sulfur subunit.
pubmed:affiliation
Department of Biomedical Chemistry, Graduate School of Medicine, University of Tokyo, Japan.
pubmed:publicationType
Journal Article, Comparative Study, Research Support, Non-U.S. Gov't