Journal
BIOCONJUGATE CHEMISTRY
Volume 13, Issue 3, Pages 693-698Publisher
AMER CHEMICAL SOC
DOI: 10.1021/bc015570i
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The preparation of several transition metal-carbonyl tracers of biotin and avidin is described. Multiple labeling of avidin was achieved by acylation of some of its amine-bearing residues with N-succinimidyl 4-pentynoate (dicobalt hexacarbonyl). By varying the initial amount of this complex, protein conjugates with the extent of derivatization of up to 13 were obtained. Biotin was labeled with one (eta(5)-cyclopentadienyl)manganese tricarbonyl moiety by reaction of biotin hydrazide, whereas multiple labeling was reached by successive conjugation of biotin and N-succinimidyl 4-pentynoate (dicobalt hexacarbonyl) or (eta(5)-cyclopentadienyl)iron dicarbonyl (eta(1)-N-maleimidato) to poly-L-lysine or fourth generation Starburst dendrimer. All the conjugates displayed a good to excellent bioaffinity toward their respective counterparts, as measured by competitive enzymatic assays.
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