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pubmed-article:8579359pubmed:abstractTextIn previous studies mono-3,5-dibromosalicyl-fumarate was used to introduce an intramolecular crosslink (pseudo-crosslink) in the beta cleft between hemoglobin beta subunits. Sedimentation velocity analysis indicated that the product had a mean molecular weight indicating a tetramer with low dissociability. The product had a P50 higher than that of native hemoglobin and a plasma retention time in the rat of about 3 h, i.e., four times longer than untreated hemoglobin. However, the product contained a fraction which was rapidly eliminated in the urine and which had a short plasma half-time of about 20 min, indicating the presence of a dissociable fraction. We have attempted to further enhance the tetrameric stability of hemoglobin and prevent urine elimination by positioning a longer chain carboxylic acid than fumaric acid into the beta cleft. We reason that a longer molecule would allow for greater stabilizing interactions across the beta cleft. In the present study human and bovine hemoglobins were reacted with mono-3-5-dibromosalicyl muconate. Muconic acid is two carbons longer than fumaric acid. The products were acylated at the beta 82 (human) and beta 81 (bovine) lysines of the beta-cleft and had a low degree of dissociability. For reasons not presently understood, urine excretion was high and plasma half-time was not increased above that of untreated hemoglobin. In conclusion, it appears that only covalently crosslinked hemoglobins which are completely nondissociable tetramers escape filtration; tetramers with any degree of dissociability into dimers are filterable.lld:pubmed
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pubmed-article:8579359pubmed:pagination119-25lld:pubmed
pubmed-article:8579359pubmed:dateRevised2007-11-14lld:pubmed
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pubmed-article:8579359pubmed:articleTitleStabilization of the tetrameric structure of human and bovine hemoglobins by pseudocrosslinking with muconic acid.lld:pubmed
pubmed-article:8579359pubmed:affiliationDepartment of Biochemistry, School of Medicine, University of Maryland at Baltimore 21201, USA.lld:pubmed
pubmed-article:8579359pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:8579359pubmed:publicationTypeResearch Support, U.S. Gov't, P.H.S.lld:pubmed
pubmed-article:8579359pubmed:publicationTypeResearch Support, Non-U.S. Gov'tlld:pubmed
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