UspA The universal stress protein UspA <db_xref db="SWISSPROT" dbkey="P28242"/> [<cite idref="PUB00003858"/>] is a small cytoplasmicbacterial protein whose expressionis enhanced when the cell is exposed tostress agents. UspA enhances the rate of cell survival duringprolonged exposure to such conditions, and may provide a general"stress endurance" activity.The crystal structure of <taxon tax_id="727">Haemophilus influenzae</taxon> UspA [<cite idref="PUB00009389"/>] revealsan alpha/beta fold similar to that of the <taxon tax_id="2190">Methanocaldococcus jannaschii</taxon> (Methanococcus jannaschii)MJ0577 protein, which binds ATP [<cite idref="PUB00007929"/>], though UspA lacks ATP-bindingactivity.