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231225s2020 xx |||||o 00| ||eng c |
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|a 10.1021/acs.langmuir.0c00770
|2 doi
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|a pubmed24n1032.xml
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|a (NLM)32390436
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|a DE-627
|b ger
|c DE-627
|e rakwb
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|a eng
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|a Li, Lei
|e verfasserin
|4 aut
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|a Characterization of the Spatial Organization of Raf Isoforms Interacting with K-Ras4B in the Lipid Membrane
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|c 2020
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|a Text
|b txt
|2 rdacontent
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|a ƒaComputermedien
|b c
|2 rdamedia
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|a ƒa Online-Ressource
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|a Date Completed 21.06.2021
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|a Date Revised 21.06.2021
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|a published: Print-Electronic
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|a Citation Status MEDLINE
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|a Activation of Raf kinases by the membrane-anchored protein K-Ras4B is a key step of cellular signal regulation. As a predominant variant of the Ras family, K-Ras4B has been considered to be a major drug target in cancer therapy. Therefore, an integrated study of Raf interaction with membrane-associated K-Ras4B is essential. While the Ras-binding domain (RBD) of Raf contains the main binding interface to K-Ras4B, its cysteine-rich domain (CRD) is thought to be responsible for its association with the membrane interface. We applied time-lapse tapping-mode atomic force microscopy to visualize and characterize the interaction of these binding motifs of A-, B-, and C-Raf isoforms with K-Ras4B in a raft-like anionic model biomembrane. However, we found that the RBDs of the Raf isomers are readily recruited to K-Ras4B nanoclusters in the lipid membrane, with different efficiencies. Unexpectedly and different from A-Raf-RBD, B- and C-Raf-RBD are able to bind markedly also directly to the lipid membrane. We also found that Raf-RBD-CRD is readily recruited to the K-Ras4B forming nanoclusters in the fluid membrane phase, with the CRD domains binding to the lipid interface. The K-Ras4B-nanoclusters are likely to enhance Raf binding and activate signaling by enriching the Raf proteins and facilitating formation of Raf dimers. Interestingly, A-, B-, and C-Raf-RBD-CRD are also able to bind directly to the heterogeneous membrane surrounding the K-Ras4B nanoclusters, which could potentially enhance the overall affinity to K-Ras4B in a Raf-isoform-dependent manner. Overall, these results provide new insights into the spatial organization of the membrane-associated Raf-Ras signaling module for the various Raf isoforms, which is important for understanding the activation of Raf kinases and required for the development of drugs against cancers through targeting Raf-Ras interactions
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|a Journal Article
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|a Research Support, Non-U.S. Gov't
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|a Lipids
|2 NLM
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|a Protein Isoforms
|2 NLM
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|a Möbitz, Simone
|e verfasserin
|4 aut
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|a Winter, Roland
|e verfasserin
|4 aut
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|i Enthalten in
|t Langmuir : the ACS journal of surfaces and colloids
|d 1992
|g 36(2020), 21 vom: 02. Juni, Seite 5944-5953
|w (DE-627)NLM098181009
|x 1520-5827
|7 nnns
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|g volume:36
|g year:2020
|g number:21
|g day:02
|g month:06
|g pages:5944-5953
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|u http://dx.doi.org/10.1021/acs.langmuir.0c00770
|3 Volltext
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