Protein
Tetrahedral aminopeptidase
Organism
Pyrococcus horikoshii (strain ATCC 700860 / DSM 12428 / JCM 9974 / NBRC 100139 / OT-3)
Function
Functions as an aminopeptidase, with a clear preference for leucine as the N-terminal amino acid. However, can also cleave moderately long polypeptide substrates of various compositions in a fairly unspecific manner. Has neither carboxypeptidase nor endoproteolytic activities, and it is devoid of N-terminal deblocking activity. Is involved in protein degradation, performing degradation of oligopeptides produced by the proteasome into single amino acids.
Similarity
Belongs to the peptidase M42 family.
Sequence
MEVRNMVDYELLKKVVEAPGVSGYEFLGIRDVVIEEIKDYVDEVKVDKLGNVIAHKKGEGPKVMIAAHMDQIGLMVTHIEKNGFLRVAPIGGVDPKTLIAQRFKVWIDKGKFIYGVGASVPPHIQKPEDRKKAPDWDQIFIDIGAESKEEAEDMGVKIGTVITWDGRLERLGKHRFVSIAFDDRIAVYTILEVAKQLKDAKADVYFVATVQEEVGLRGARTSAFGIEPDYGFAIDVTIAADIPGTPEHKQVTHLGKGTAIKIMDRSVICHPTIVRWLEELAKKHEIPYQLEILLGGGTDAGAIHLTKAGVPTGALSVPARYIHSNTEVVDERDVDATVELMTKALENIHELKI