Binding Site

Aminotransferase, class-II, pyridoxal-phosphate binding site (IPR001917)

Short name: Aminotrans_II_pyridoxalP_BS


Aminotransferases share certain mechanistic features with other pyridoxal-phosphate dependent enzymes, such as the covalent binding of the pyridoxal-phosphate group to a lysine residue. On the basis of sequence similarity, these various enzymes can be grouped into subfamilies. One of these, is called class-II. It consists of Serine palmitoyltransferase (EC:, Histidinol-phosphate aminotransferase (EC:, Glycine acetyltransferase EC:, 5-aminolevulinic acid synthase (EC: and 8-amino-7-oxononanoate synthase (EC:

The crystal structures of a number of the aminotransferases have been determined including the structure of l-histidinol phosphate aminotransferase from Escherichia coli (HisC) [PMID: 11518529]. HisC is a dimeric enzyme with a mass of approximately 80 kDa. Like most pyridoxal-5'-phosphate (PLP)-dependent enzymes, each HisC monomer consists of two domains, a larger PLP-binding domain having an alpha/beta/alpha topology, and a smaller domain. The N-terminal arm contributes to the dimerization of the two monomers. The PLP-binding domain of HisC shows weak sequence similarity, but significant structural similarity with the PLP-binding domains of a number of PLP-dependent enzymes.

GO terms

Biological Process

No terms assigned in this category.

Molecular Function

GO:0016740 transferase activity

Cellular Component

No terms assigned in this category.

Contributing signatures

Signatures from InterPro member databases are used to construct an entry.
PROSITE patterns