Type 3 secretion system needle filament protein

UniProtKB accession:  O68691

Grouped By:  Matching UniProtKB accession

UniProtKB description:  Component of the type III secretion system (T3SS), also called injectisome, which is used to inject bacterial effector proteins into eukaryotic host cells (PubMed:16135236). YscF/SctF forms the external needle filament that protrudes from the bacterial surface (PubMed:16135236, PubMed:19968786, PubMed:28196868). Essential for the calcium-dependent regulation of T3SS and Yop secretion (PubMed:16135236). Required to block Yop secretion in the presence of extracellular calcium (PubMed:16135236). May be the extracellular T3SS component that senses extracellular calcium and/or participates in transmitting the calcium signal to the cytoplasmic compartment where the block in secretion is initiated (PubMed:16135236).