Stimulates the activity of serine palmitoyltransferase (SPT). The composition of the serine palmitoyltransferase (SPT) complex determines the substrate preference, complexes with this subunit showing a clear preference for longer acyl-CoAs. The SPTLC1-SPTLC2-SPTSSB complex shows a strong preference for C18-CoA substrate, while the SPTLC1-SPTLC3-SPTSSB isozyme displays an ability to use a broader range of acyl-CoAs, without apparent preference (By similarity).

Belongs to the SPTSS family. SPTSSB subfamily.

76 amino acids

MDFKRVKDYLSWLYYQYQIISCCAVLEPWEQSMFNTIILTIFAMVVYTAYVFIPIHIRLAWEFFSKMCGYHSTISN

9.2 kDa

(Note: Representative image - actual molecular weight may vary depending on tag type and expression method)

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