Abstract
Serum albumin (SA) is a prevalent carrier protein in blood. SA carries a diverse range of nutrients, drugs, and metal ions. It has wide clinical and biochemical applications. In veterinary use, human serum albumin (HSA) was administered to increase albumin level and osmotic pressure in critically ill dogs and cats, but this therapy is very expensive and under debate. Using other albumins is one of the alternatives for a cross-species usage. Thus, understanding structural dynamics of albumins from other animals becomes essential. In this work, feline serum albumin (FSA) is computationally studied in comparison with bovine (BSA), canine (CSA), and human (HSA) serum albumins from a previous work for the first time. FSA shares high sequence identity to CSA, but its dynamics resembles HSA and BSA. Like other albumins, the different movement of domains I and III is a signature of each albumin. FSA shows similar size of Sudlow site I to BSA and HSA, whereas its Sudlow site II is smaller. This permits the different drug-binding affinity of FSA at Sudlow site II. Furthermore, C34 in FSA is more flexible than HSA due to no interaction with Y84 that anchors C34 on a protein surface. An increased flexibility of C34 thiol group can easily trigger undesired thiolation or dimerization. Although FSA shares similar dynamics to HSA, its different ligand-binding affinity can be a key weakness to serve as a HSA substitute in cross-species animals.
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Abbreviations
- FSA:
-
Feline serum albumin
- BSA:
-
Bovine serum albumin
- CSA:
-
Canine serum albumin
- HSA:
-
Human serum albumin
- MD:
-
Molecular dynamics
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We would like to thank Kasetsart University Research and Development Institute (KURDI) and National Nanotechnology Center (NANOTEC, Grant no. P1751330) for financial support.
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Pongprayoon, P., Japrung, D. Revealing the structural dynamics of feline serum albumin. Struct Chem 32, 69–77 (2021). https://doi.org/10.1007/s11224-020-01619-4
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DOI: https://doi.org/10.1007/s11224-020-01619-4