Determination of the carbohydrate-binding properties of peanut agglutinin by ultraviolet difference spectroscopy

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TypeArticle
ISSN1083-351X
AbstractThe anti-T lectin from peanuts was purified on a new affinity matrix, and the number of carbohydrate binding sites was determined by equilibrium dialysis with [14C]lactose to be four per tetramer. Methyl-alpha- and methyl-beta-D-galactopyranoside and lactose were found to perturb the UV spectrum of the lectin in the aromatic region and their association constants were determined by UV difference spectroscopy to be 1.8, 1.0, and 1.3 X 10(3) M⁻¹, respectively, at 25 degrees C. Thermodynamic parameters were also obtained for the two galactosides from measurements at several temperatures. For the alpha anomer, delta H degrees = -42 kJ mol⁻¹ and delta S degrees = -78 J K⁻¹ mol⁻¹; for the beta anomer, ∆ H degrees = -43 kJ mol⁻¹, and ∆S degrees = -86 J K⁻¹ mol⁻¹. Analysis of the lectin for metal atoms disclosed 0.98 mol of Ca²⁺ and 0.78 mol of Mg²⁺ subunit, while manganese was present in trace amounts only. The results of the present study indicate that recent improvements in instrumentation should make UV difference spectroscopy more widely applicable to studies of protein-ligand interactions.
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Linkhttp://www.jbc.org/content/255/19/9205.abstract
LanguageEnglish
AffiliationNational Research Council Canada
Peer reviewedYes
NPARC number23001360
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Record identifier54bcac8b-d96c-46a7-8688-6199829eaae6
Record created2017-01-23
Record modified2017-01-23
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