Cdc37 is a molecular chaperone required for the activity of numerous eukaryotic protein kinases. This domain corresponds to the N terminal domain which binds predominantly to protein kinases [2] and is found N terminal to the Hsp (Heat shocked protein) 90-binding domain Pfam:PF08565. Expression of a construct consisting of only the N-terminal domain of Saccharomyces pombe Cdc37 results in cellular viability. This indicates that interactions with the cochaperone Hsp90 may not be essential for Cdc37 function [2].

1: Cdc37 is a molecular chaperone with specific functions in signal transduction. Kimura Y, Rutherford SL, Miyata Y, Yahara I, Freeman BC, Yue L, Morimoto RI, Lindquist S; Genes Dev 1997;11:1775-1785. PMID:9242486

2: Cdc37 maintains cellular viability in Schizosaccharomyces pombe independently of interactions with heat-shock protein 90. Turnbull EL, Martin IV, Fantes PA; FEBS J 2005;272:4129-4140. PMID:16098195