Linked Life Data

1692481

Source:http://linkedlifedata.com/resource/pubmed/id/1692481

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
9
pubmed:dateCreated
1990-6-19
pubmed:abstractText
This paper deals with stopped-flow studies on the kinetics of the regain of immunoreactivity toward five distinct monoclonal antibodies during the folding of the guanidine-unfolded beta 2 subunit of Escherichia coli tryptophan synthase and of two complementary proteolytic fragments of beta, F1 (N-terminal; Mw = 29,000) and F2 (C-terminal; Mw = 12,000). It is shown that, while selected as being "specific" for the native protein, these antibodies are all able to recognize early folding intermediates. The two antigenic determinants carried by the F2 domain and the antigenic site carried by the hinge peptide linking F1 and F2 are present so early during the folding process that their kinetics of appearance could not be followed. On the contrary, the rate constants of appearance of two "native-like" epitopes, carried by F1, could be determined during the folding of beta chains. The rate constant of appearance of the epitope to antibody 19 was found to be k = 0.065 s-1 at 12 degrees C. This value is very similar to that we reported previously for the appearance of an early epitope to the same antibody during the folding of acid-denatured beta chains. Thus, in spite of the important structural differences between guanidine-unfolded and acid-denatured beta chains, the same early folding events seem to be involved in the appearance of this epitope. The rate constant was found to be significantly smaller (k = 0.02 s-1 at 12 degrees C) for the appearance of the epitope to antibody 9. This shows that the regain of immunoreactivity is not concerted within the F1 domain.(ABSTRACT TRUNCATED AT 250 WORDS)
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Mar
pubmed:issn
0006-2960
pubmed:author
pubmed:issnType
Print
pubmed:day
6
pubmed:volume
29
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
2409-17
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed:year
1990
pubmed:articleTitle
Kinetic characterization of early immunoreactive intermediates during the refolding of guanidine-unfolded Escherichia coli tryptophan synthase beta 2 subunits.
pubmed:affiliation
Unité de Biochimie Cellulaire, CNRS UA 1129, Institut Pasteur, Paris, France.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't