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- W2012965539 abstract "Temperature-dependent dissociation of porcine luteinizing hormone (pLH) and of two of its glycoforms was studied by a combination of SDS-PAGE and micro-scale size-exclusion HPLC in parallel with the study of co-operative folding by high-sensitivity differential scanning calorimetry (HS-DSC). The transition temperature of dissociation of pLH at pH 7.0 as quantified by SDS-PAGE, HPLC and residual activity in radioreceptor assay was found to match exactly the transition temperature of its unfolding as measured by HS-DSC. Free alpha- and beta-subunits did not exhibit any unfolding transition in the same conditions. The microcalorimetric data for two pLH isoforms exhibiting different glycosylations were identical to those of a preparation of non-separated isoforms. It is concluded that: (a) free subunits exhibit no co-operative folding (i.e. no stable three-dimensional structure) and co-operative folding occurs only in alphabeta heterodimers; (b) the co-operative folding is responsible for the stability of the association of subunits; and (c) the heterogeneity of carbohydrate chains does not affect the stability of folding and association of subunits. The fastening of the seat-belt of the beta-subunit embracing the alpha-subunit by the Cysbeta26-beta110 disulfide bridge had been postulated to play a role in the preservation of the dimeric structure of gonadotropins. The present work shows that dissociation of subunits is directly related to their loss of common co-operative folding." @default.
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- W2012965539 date "2001-05-01" @default.
- W2012965539 modified "2023-09-27" @default.
- W2012965539 title "Conformational stability and in vitro bioactivity of porcine luteinizing hormone" @default.
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- W2012965539 doi "https://doi.org/10.1016/s0303-7207(01)00447-6" @default.
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