A crosslinker based on a tethered electrophile for mapping kinase-substrate networks

Area of Science:

• Biochemistry
• Chemical Biology
• Molecular Biology

Background:

• Kinase signaling networks are vital for cellular processes, but many phosphorylation events lack identified kinases.
• Previous methods using dialdehyde-based probes showed limitations in crosslinked kinase-substrate product yield.

Purpose of the Study:

• To develop a more efficient method for covalently crosslinking peptide substrates to their phosphorylating kinases.
• To overcome the yield limitations observed with previous dialdehyde-based crosslinking probes.

Main Methods:

• Investigated the yield of a previously reported dialdehyde-based kinase-binding probe.
• Developed and tested a novel crosslinking scheme utilizing a kinase activity-based probe.

Main Results:

• Dialdehyde-based probes exhibited significant limitations in crosslinked kinase-substrate product yield.
• The newly developed kinase activity-based probe demonstrated increased efficiency and substrate specificity.
• Successful crosslinking was achieved even within complex cell lysate environments.

Conclusions:

• Kinase activity-based probes offer a superior strategy for identifying unknown kinases through covalent crosslinking.
• The developed method enhances efficiency and specificity in mapping kinase signaling pathways.
• This approach holds promise for advancing the understanding of kinase function in biological systems.