Recombinant E. coli SSB protein

Supplementary information

This supplementary information is collated from multiple sources and compiled automatically.

The single-stranded DNA-binding protein (SSB) also known as La protein in humans has a mechanical role in stabilizing single-stranded DNA (ssDNA) during replication recombination and repair processes. In E. coli the SSB protein weighs approximately 19 kDa and is essential for maintaining genome integrity. SSB expression occurs in various organisms with bacterial SSBs being key to prokaryotic cells while homologs like La/SSB in humans are more involved in post-transcriptional processes. Anti-SSB antibodies target this protein often in research and diagnostic applications.

Biological function summary

The single-stranded DNA-binding protein plays an important role in the orchestration of DNA metabolism. It binds to ssDNA substrates acting as a scaffold for recruiting other proteins and it frequently involves itself in complex formation with other cellular factors such as replication proteins. This function proves important in stabilizing unwound DNA and regulating access for proteins involved in DNA synthesis and repair. Anti-La SSB antibodies are typically used to study aberrant RNA processing events.

Pathways

The SSB protein influences the DNA replication and repair pathways. SSB's interaction with proteins like DNA polymerase and exonuclease suggests its cooperation with these enzymes to ensure precise DNA synthesis and to facilitate proper repair of DNA. Anti-SSB Ab can be used to investigate specific pathway dysregulations providing insights into pathway alterations that impact genome stability. Notably SSB's role in coordinating with other repair proteins emphasizes its centrality in maintaining steady state of DNA integrity.

The single-stranded DNA-binding protein has vital connections to autoimmune diseases. Sjögren's syndrome and systemic lupus erythematosus often see the presence of anti-SSB antibodies indicating an autoimmune response against this protein. These disorders associate with the human La protein an autoimmune target in these disease states. Understanding SSB's interaction with other proteins such as Ro60 in these conditions gives insights into disease pathology and potential areas for therapeutic intervention.