Document Detail

Effects of temperature and urea concentration on the chemical modification and ionization behavior of tyrosyl and iodoamino acid residues of porcine thyroglobulin.
MedLine Citation:
PMID:  639754     Owner:  NLM     Status:  MEDLINE    
Acetylation of porcine thyroglobulin with N-acetyl imidazole was performed at various temperatures in the presence of urea. In the medium without urea, the number of O-acetylated iodoamino acid residues formed was constantly 15 above 10 degrees C (originating from all diiodotyrosyl and a few of monoiodotyrosyl residues), while the number of O-acetyl tyrosyl residues increased gradually from 15 at 0 degrees C to a maximum of 70 at 70 degrees C. All (about 25) iodoamino acid residues were acetylated at 20 degrees C in 2 M urea, while the presence of 8 M urea was necessary to acetylate all tyrosyl residues at 20 degrees C. Experiments on the nitration of thyroglobulin with tetranitromethane showed that diiodotyrosyl and thyroxyl residues were easily nitrated even at low temperatures and the low ratio of the reagent to the protein, while tyrosyl residues consisted of three groups: the first group (about 14%) which was very easily nitrated even at 0 degrees C and the low ratio of the reagent to the protein, the second group (about 45%) which was nitrated depending on temperature and the molar ratio of the reagent, the remaining which was definitely unreactive even under extreme conditions. In addition, the ionization of tyrosyl and iodoamino acid residues was studied by spectrophotometric titration at various temperatures in the presence and absence of 8 M urea. It was found that diiodotyrosyl and thyroxyl residues did not change very much with respect to ionization behaviour by the addition of urea, in contrast to clear dependence of tyrosyl residues on urea. Based on these observations, the location of these residues and the structural change of the protein with temperature are discussed.
E Itagaki; T Hosoya
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Endocrinologia japonica     Volume:  25     ISSN:  0013-7219     ISO Abbreviation:  Endocrinol. Jpn.     Publication Date:  1978 Feb 
Date Detail:
Created Date:  1978-06-28     Completed Date:  1978-06-28     Revised Date:  2003-11-14    
Medline Journal Info:
Nlm Unique ID:  0376546     Medline TA:  Endocrinol Jpn     Country:  JAPAN    
Other Details:
Languages:  eng     Pagination:  43-53     Citation Subset:  IM    
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MeSH Terms
Amino Acids / analysis*
Diiodotyrosine / analysis
Iodine / analysis
Thyroglobulin / analysis*
Urea / pharmacology*
Reg. No./Substance:
0/Amino Acids; 57-13-6/Urea; 66-02-4/Diiodotyrosine; 7553-56-2/Iodine; 9010-34-8/Thyroglobulin

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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