Linked Life Data

2643389

Source:http://linkedlifedata.com/resource/pubmed/id/2643389

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
1
pubmed:dateCreated
1989-2-15
pubmed:abstractText
31P NMR studies were undertaken to determine how potassium ion increases the cofactor affinity of Escherichia coli D-serine dehydratase, a model pyridoxal 5'-phosphate requiring enzyme that converts the growth inhibitor D-serine to pyruvate and ammonia. Potassium ion was shown to promote the appearance of a second upfield shifted cofactor 31P resonance at 4.0 ppm (pH 7.8, 25 degrees C), that increased in area at the expense of the resonance at 4.4 ppm observed in the absence of K+. Na+ antagonized the K+ promoted appearance of the second resonance. These observations suggest that K+ and Na+ stabilize conformational states that differ with respect to O-P-O bond angle, conformation, and/or hydrogen bonding of the phosphate group. An analysis of the dependence of the relative intensities of the two resonances on the K+ concentration yielded a value of ca. 10 mM for the equilibrium constant for dissociation of K+ from D-serine dehydratase. The chemical shift difference between the two resonances indicated that the K+-stabilized and Na+-stabilized forms of the enzyme interconvert at a frequency less than 16 s-1 at pH 7.8, 25 degrees C.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Jan
pubmed:issn
0003-9861
pubmed:author
pubmed:issnType
Print
pubmed:volume
268
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
67-73
pubmed:dateRevised
2007-11-14
pubmed:meshHeading
pubmed:year
1989
pubmed:articleTitle
Effect of potassium ion on the phosphorus-31 nuclear magnetic resonance spectrum of the pyridoxal 5'-phosphate cofactor of Escherichia coli D-serine dehydratase.
pubmed:affiliation
Department of Biological Chemistry, University of Michigan, Ann Arbor 48109.
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, P.H.S.