Linked Life Data

3166989

Source:http://linkedlifedata.com/resource/pubmed/id/3166989

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
12
pubmed:dateCreated
1988-11-18
pubmed:abstractText
Reported are the first examinations by 31P NMR of erythrocytes containing the non-heme iron O2-carrying protein hemerythrin (Hr). Intact coelomic erythrocytes from the sipunculids Phascolopsis gouldii and Themiste zostericola were shown by 31P NMR to contain O-phosphorylethanolamine and 2-aminoethylphosphonate as the major soluble phosphorus metabolites. This combination of major metabolites appears to be unique to sipunculan erythrocytes. Nucleoside triphosphates and mannose 1-phosphate were present in lower concentrations. The concentration of O-phosphorylethanolamine within P. gouldii erythrocytes was established to be greater than 20 mM. T. zostericola erythrocytes contained relatively high levels of 2-aminoethylphosphonate (on the order of 0.1 M) and lower levels of O-phosphorylethanolamine compared with those of P. gouldii. For P. gouldii and T. zostericola the intracellular pHs were determined to be 7.2 +/- 0.1 and 7.1 +/- 0.1, respectively, in air-equilibrated erythrocytes, and 6.5 +/- 0.1 in anaerobic P. gouldii erythrocytes. O-Phosphorylethanolamine was found to bind weakly to P. gouldii metHr (Kf approximately 7 M-1). This interaction is best characterized by either negative cooperativity or nonspecific binding. O-Phosphorylethanolamine strongly inhibits azide binding to the iron site of P. gouldii metHr at pH 7.2. The rate of azide binding decreases by approximately 85-fold in the presence of 0.33 M O-phosphorylethanolamine. However, neither O-phosphorylethanolamine nor 2-aminoethylphosphonate at 0.33 M was found to have any significant effect on O2 affinity of P. gouldii deoxyHr. Alternative functions for the two metabolites are suggested.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Jun
pubmed:issn
0006-2960
pubmed:author
pubmed:issnType
Print
pubmed:day
14
pubmed:volume
27
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
4458-65
pubmed:dateRevised
2007-11-14
pubmed:meshHeading
pubmed:year
1988
pubmed:articleTitle
31P NMR probes of sipunculan erythrocytes containing the O2-carrying protein hemerythrin.
pubmed:affiliation
Department of Chemistry, Iowa State University, Ames 50011.
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, P.H.S.