Journal
SCIENTIFIC REPORTS
Volume 6, Issue -, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/srep35015
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Funding
- CSIR-CCMB
- Council of Scientific and Industrial Research (India)
- University Grants Commission (India)
- J.C. Bose Fellowship (Department of Science and Technology, Govt. of India)
- Ramalingaswami Fellowship (Department of Biotechnology, Govt. of India)
- Multi-Scale Simulation and Modeling project-MSM [CSC0129]
- Sharon D Lund foundation grant
- Swedish Cancer Society
- Medical Faculty (Lund University)
- Soderberg Foundation
- Segerfalk Foundation
- Maggie Stephens Foundation
- Gunnar Nilsson Cancer Foundation
- Inga-Britt and Arne Lundberg Foundation
- HJ Forssman Foundation for Medical Research
- Royal Physiographic Society
- Provost office, Nanyang Technological University, Singapore
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Bovine alpha-lactalbumin (BLA) forms cytotoxic complexes with oleic acid (OA) that perturbs tumor cell membranes, but molecular determinants of these membrane-interactions remain poorly understood. Here, we aim to obtain molecular insights into the interaction of BLA/BLA-OA complex with model membranes. We characterized the folding state of BLA-OA complex using tryptophan fluorescence and resolved residue-specific interactions of BLA with OA using molecular dynamics simulation. We integrated membrane-binding data using a voltage-sensitive probe and molecular dynamics (MD) to demonstrate the preferential interaction of the BLA-OA complex with negatively charged membranes. We identified amino acid residues of BLA and BLA-OA complex as determinants of these membrane interactions using MD, functionally corroborated by uptake of the corresponding alpha-LA peptides across tumor cell membranes. The results suggest that the alpha-LA component of these cytotoxic complexes confers specificity for tumor cell membranes through protein interactions that are maintained even in the lipid complex, in the presence of OA.
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