How human serum albumin recognizes DNA and RNA

How human serum albumin recognizes DNA and RNA AbstractWe show here for the first time that HSA possesses two nucleic acid-(NA) binding sites and we estimated the relative contributions of the nucleotide links of (pN)n to their total affinity for these binding sites with higher and lower affinity for NAs. The minimal ligands of these binding sites are orthophosphate (Kd=3.0 and 20.0 mm), various dNMPs (5.6–400 μm and 0.063–18 mm) and different rNMPs (4.9–30 μm and 14–250 μm). Maximal contribution to the total affinity of all NAs to the first and second sites was observed for one nucleotide and was remarkably lower for three additional nucleotide units of (pN)n (n=1–4) with a significant decrease in the contribution at n=5–6, and at n≥7–8 all dependencies reached plateaus. For d(pA)n and r(pA)n a relatively gradual decrease in the contribution to the affinity at n=1–6 was observed, while several d(pN)n, demonstrated a sharp increase in the contribution at n=2–4. Finally, all (pN)n>10 demonstrated high affinity for the first (1.4–150 nm) and the second (80–2400 nm) sites of HSA. Double-stranded NAs showed significantly lower affinity comparing with single-stranded ligands. The thermodynamic parameters characterizing the specific contribution of every nucleotide link of all (pN)1−9 (ΔG°) to their total affinity for HSA were estimated. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Biological Chemistry de Gruyter

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Publisher
De Gruyter
Copyright
©2018 Walter de Gruyter GmbH, Berlin/Boston
ISSN
1437-4315
eISSN
1437-4315
D.O.I.
10.1515/hsz-2017-0243
Publisher site
See Article on Publisher Site

Abstract

AbstractWe show here for the first time that HSA possesses two nucleic acid-(NA) binding sites and we estimated the relative contributions of the nucleotide links of (pN)n to their total affinity for these binding sites with higher and lower affinity for NAs. The minimal ligands of these binding sites are orthophosphate (Kd=3.0 and 20.0 mm), various dNMPs (5.6–400 μm and 0.063–18 mm) and different rNMPs (4.9–30 μm and 14–250 μm). Maximal contribution to the total affinity of all NAs to the first and second sites was observed for one nucleotide and was remarkably lower for three additional nucleotide units of (pN)n (n=1–4) with a significant decrease in the contribution at n=5–6, and at n≥7–8 all dependencies reached plateaus. For d(pA)n and r(pA)n a relatively gradual decrease in the contribution to the affinity at n=1–6 was observed, while several d(pN)n, demonstrated a sharp increase in the contribution at n=2–4. Finally, all (pN)n>10 demonstrated high affinity for the first (1.4–150 nm) and the second (80–2400 nm) sites of HSA. Double-stranded NAs showed significantly lower affinity comparing with single-stranded ligands. The thermodynamic parameters characterizing the specific contribution of every nucleotide link of all (pN)1−9 (ΔG°) to their total affinity for HSA were estimated.

Journal

Biological Chemistryde Gruyter

Published: Mar 28, 2018

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