ID   NEP1_NEPDI              Reviewed;         164 AA.
AC   P69476;
DT   15-MAR-2005, integrated into UniProtKB/Swiss-Prot.
DT   15-MAR-2005, sequence version 1.
DT   02-SEP-2026, entry version 65.
DE   RecName: Full=Aspartic proteinase nepenthesin-1;
DE            EC=3.4.23.12;
DE   AltName: Full=Nepenthesin-I;
DE   Flags: Fragments;
OS   Nepenthes distillatoria (Pitcher plant).
OC   Eukaryota; Viridiplantae; Streptophyta; Embryophyta; Tracheophyta;
OC   Spermatophyta; Magnoliopsida; eudicotyledons; Gunneridae; Pentapetalae;
OC   Caryophyllales; Nepenthaceae; Nepenthes.
OX   NCBI_TaxID=122309;
RN   [1]
RP   PARTIAL PROTEIN SEQUENCE, CHARACTERIZATION, TISSUE SPECIFICITY, SUBCELLULAR
RP   LOCATION, AND VARIANT TYR-31.
RC   TISSUE=Pitcher;
RX   PubMed=15035659; DOI=10.1042/bj20031575;
RA   Athauda S.B.P., Matsumoto K., Rajapakshe S., Kuribayashi M., Kojima M.,
RA   Kubomura-Yoshida N., Iwamatsu A., Shibata C., Inoue H., Takahashi K.;
RT   "Enzymic and structural characterization of nepenthesin, a unique member of
RT   a novel subfamily of aspartic proteinases.";
RL   Biochem. J. 381:295-306(2004).
CC   -!- FUNCTION: Extracellular proteinase found in the pitcher fluid of
CC       carnivorous plants. Digest prey for nitrogen uptake.
CC   -!- CATALYTIC ACTIVITY:
CC       Reaction=Similar to pepsin, but also cleaves on either side of Asp and
CC         at Lys-|-Arg.; EC=3.4.23.12;
CC   -!- ACTIVITY REGULATION: Inhibited by pepstatin and by diazoacetyl-D,L-
CC       norleucine methyl ester (DAN) in the presence of Cu(2+) ions.
CC   -!- BIOPHYSICOCHEMICAL PROPERTIES:
CC       pH dependence:
CC         Optimum pH is 2.6. Retains 95% and 79% of the original activity after
CC         incubation for 30 days at pH 3.0 and pH 10.0 respectively.;
CC       Temperature dependence:
CC         Optimum temperature is 55 degrees Celsius. Thermostable up to 50
CC         degrees Celsius. Retains 60% of the original activity after
CC         incubation for 30 days at 50 degrees Celsius.;
CC   -!- SUBCELLULAR LOCATION: Secreted {ECO:0000269|PubMed:15035659}.
CC   -!- TISSUE SPECIFICITY: Parenchymal cells surrounding the secretory glands.
CC       {ECO:0000269|PubMed:15035659}.
CC   -!- SIMILARITY: Belongs to the peptidase A1 family. {ECO:0000305}.
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DR   MEROPS; A01.A47; -.
DR   GO; GO:0005576; C:extracellular region; IEA:UniProtKB-SubCell.
DR   Gene3D; 2.40.70.10; Acid Proteases; 1.
DR   InterPro; IPR033121; PEPTIDASE_A1.
DR   InterPro; IPR021109; Peptidase_aspartic_dom_sf.
DR   InterPro; IPR051708; Plant_Aspart_Prot_A1.
DR   InterPro; IPR032861; TAXi_N.
DR   PANTHER; PTHR47967:SF23; OS04G0448300 PROTEIN; 1.
DR   PANTHER; PTHR47967; OS07G0603500 PROTEIN-RELATED; 1.
DR   Pfam; PF14543; TAXi_N; 1.
DR   SUPFAM; SSF50630; Acid proteases; 1.
DR   PROSITE; PS51767; PEPTIDASE_A1; 1.
PE   1: Evidence at protein level;
KW   Aspartyl protease; Direct protein sequencing; Glycoprotein; Hydrolase;
KW   Protease; Secreted; Zymogen.
FT   CHAIN           1..>164
FT                   /note="Aspartic proteinase nepenthesin-1"
FT                   /id="PRO_0000199513"
FT   DOMAIN          17..>164
FT                   /note="Peptidase A1"
FT                   /evidence="ECO:0000255|PROSITE-ProRule:PRU01103"
FT   ACT_SITE        35
FT                   /evidence="ECO:0000255|PROSITE-ProRule:PRU10094"
FT   CARBOHYD        93
FT                   /note="N-linked (GlcNAc...) asparagine"
FT                   /evidence="ECO:0000255"
FT   VARIANT         31
FT                   /note="S -> Y"
FT                   /evidence="ECO:0000269|PubMed:15035659"
FT   NON_CONS        55..56
FT                   /evidence="ECO:0000305"
FT   NON_CONS        72..73
FT                   /evidence="ECO:0000305"
FT   NON_CONS        100..101
FT                   /evidence="ECO:0000305"
FT   NON_CONS        113..114
FT                   /evidence="ECO:0000305"
FT   NON_CONS        118..119
FT                   /evidence="ECO:0000305"
FT   NON_CONS        126..127
FT                   /evidence="ECO:0000305"
FT   NON_CONS        148..149
FT                   /evidence="ECO:0000305"
FT   NON_TER         164
SQ   SEQUENCE   164 AA;  17271 MW;  60C08491850E4F08 CRC64;
     IGPSGVETTV YAGDGEYLMX LSIGTPAQPF SAIMDTGSDL IWTQXQPXTQ XFXQSDPQGS
     SSFSTLPCGY GDSETQGSMG TETFTFGSVS IPNITFGXGE GPLPLPXQLD VAKYITLDLP
     IDPSAFDLCF QTPSDPSNLQ IPTFVMHFDT GNSVVSFVSA QCGA
//