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inpE

Gene
inpE
Protein
Proteasome subunit beta inpE
Organism
Emericella nidulans (strain FGSC A4 / ATCC 38163 / CBS 112.46 / NRRL 194 / M139)
Length
215 amino acids
Function
Proteasome subunit beta type-6; part of the inp gene cluster that mediates the biosynthesis of fellutamide B, a mycotoxin that acts as a proteasome inhibitor (PubMed:20952652, PubMed:27294372). In the first step of fellutabmide B biosynthesis inpC activates 3-hydroxydodecanoic acid to generate 3-hydroxydodecanoyl-AMP that is then loaded onto the T0 domain of inpB (PubMed:27294372). The 3-hydroxydodecanoyl-S-phosphopantetheinyl-T0 is sequentially extended with L-Asn and L-Gln by the two CAT modules of inpB (PubMed:27294372). The linear lipodipeptide from inpB is then transferred onto inpA for the addition of the third amino acid, L-Leu (PubMed:27294372). Reductive releasing of the lipotripeptide by the TE domain of inpA produces (2S)-fellutamide B (PubMed:27294372). InpF might be involved in the release and transfer of the lipodipeptide from inpB to inpA (PubMed:27294372). The inp cluster-encoded proteasome subunit inpE confers resistance to internally produced fellutamides (PubMed:27294372). The MFS efflux transporter inpD may contribute to fellutamide resistance as well (PubMed:27294372).
Similarity
Belongs to the peptidase T1B family.
Mass
23.725 kDa
Sequence
MAKETRFYPYTSNGGATLGVSGPDFAILAGDTRSTAGYNINTRYEPKVFTIQDARDRSIVISVIGFAADGRALKERLDAIVAMYKYQHGKNIGLRACAQRVSTMLYEKRFFPYQLQTMVAGIDADGQGAIYYYDPAGCIEKRSHCAAGEASSLMLPFLDSQAPRLQPLSLQTAQQLVRDAYTGATERHIEVGDHLQMLVVTREGVSEQLVDLKKD