Src

Src is a non-receptor tyrosine kinase that plays a critical role in the regulation of cellular processes, including proliferation, differentiation, and survival. It is a member of the Src family kinases (SFKs), which are involved in the signaling pathways of various cellular receptors.

Structure

Src is composed of several domains that contribute to its function:

• SH3 domain: This domain binds to proline-rich sequences and is involved in protein-protein interactions.
• SH2 domain: This domain binds to phosphorylated tyrosine residues, allowing Src to interact with other phosphorylated proteins.
• Kinase domain: The catalytic domain responsible for the transfer of a phosphate group from ATP to a tyrosine residue on a substrate protein.
• Regulatory tail: The C-terminal tail contains a tyrosine residue that, when phosphorylated, inhibits Src activity.

Function

Src is involved in the regulation of several cellular processes:

• Cell growth and division: Src promotes cell cycle progression by phosphorylating key proteins involved in the cell cycle.
• Cell adhesion and migration: Src modulates the dynamics of the cytoskeleton and cell adhesion molecules, influencing cell movement.
• Signal transduction: Src is activated by various cell surface receptors, including growth factor receptors, integrins, and G-protein coupled receptors.

Regulation

Src activity is tightly regulated by phosphorylation:

• Activation: Dephosphorylation of the C-terminal tyrosine residue (Tyr527) leads to Src activation.
• Inhibition: Phosphorylation of Tyr527 by C-terminal Src kinase (Csk) inhibits Src activity.

Clinical Significance

Src has been implicated in several diseases, particularly cancer:

• Oncogenesis: Overexpression or constitutive activation of Src is associated with the development of various cancers, including breast cancer, colon cancer, and lung cancer.
• Therapeutic target: Src inhibitors, such as dasatinib, are used in the treatment of certain cancers.

Research

Ongoing research is focused on understanding the precise mechanisms by which Src contributes to cancer progression and identifying novel therapeutic strategies to target Src in cancer.

Also see

• Tyrosine kinase
• Signal transduction
• Oncogene
• Protein phosphorylation

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