Structure of Sla1p homology domain 1 and interaction with the NPFxD endocytic internalization motif.

Adaptor proteins play important endocytic roles including recognition of internalization signals in transmembrane cargo. Sla1p serves as the adaptor for uptake of transmembrane proteins containing the NPFxD internalization signal, and is essential for normal functioning of the actin cytoskeleton during endocytosis. The Sla1p homology domain 1 (SHD1) within Sla1p is responsible for recognition of the NPFxD signal.