ID   ATG3_PICGU              Reviewed;         293 AA.
AC   A5DN42;
DT   05-FEB-2008, integrated into UniProtKB/Swiss-Prot.
DT   10-FEB-2009, sequence version 3.
DT   25-MAY-2022, entry version 61.
DE   RecName: Full=Autophagy-related protein 3;
DE   AltName: Full=Autophagy-related E2-like conjugation enzyme ATG3;
GN   Name=ATG3; ORFNames=PGUG_04693;
OS   Meyerozyma guilliermondii (strain ATCC 6260 / CBS 566 / DSM 6381 / JCM 1539
OS   / NBRC 10279 / NRRL Y-324) (Yeast) (Candida guilliermondii).
OC   Eukaryota; Fungi; Dikarya; Ascomycota; Saccharomycotina; Saccharomycetes;
OC   Saccharomycetales; Debaryomycetaceae; Meyerozyma.
OX   NCBI_TaxID=294746;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=ATCC 6260 / CBS 566 / DSM 6381 / JCM 1539 / NBRC 10279 / NRRL Y-324;
RX   PubMed=19465905; DOI=10.1038/nature08064;
RA   Butler G., Rasmussen M.D., Lin M.F., Santos M.A.S., Sakthikumar S.,
RA   Munro C.A., Rheinbay E., Grabherr M., Forche A., Reedy J.L., Agrafioti I.,
RA   Arnaud M.B., Bates S., Brown A.J.P., Brunke S., Costanzo M.C.,
RA   Fitzpatrick D.A., de Groot P.W.J., Harris D., Hoyer L.L., Hube B.,
RA   Klis F.M., Kodira C., Lennard N., Logue M.E., Martin R., Neiman A.M.,
RA   Nikolaou E., Quail M.A., Quinn J., Santos M.C., Schmitzberger F.F.,
RA   Sherlock G., Shah P., Silverstein K.A.T., Skrzypek M.S., Soll D.,
RA   Staggs R., Stansfield I., Stumpf M.P.H., Sudbery P.E., Srikantha T.,
RA   Zeng Q., Berman J., Berriman M., Heitman J., Gow N.A.R., Lorenz M.C.,
RA   Birren B.W., Kellis M., Cuomo C.A.;
RT   "Evolution of pathogenicity and sexual reproduction in eight Candida
RT   genomes.";
RL   Nature 459:657-662(2009).
CC   -!- FUNCTION: E2 conjugating enzyme required for the cytoplasm to vacuole
CC       transport (Cvt) and autophagy. Required for selective autophagic
CC       degradation of the nucleus (nucleophagy) as well as for mitophagy which
CC       contributes to regulate mitochondrial quantity and quality by
CC       eliminating the mitochondria to a basal level to fulfill cellular
CC       energy requirements and preventing excess ROS production. Responsible
CC       for the E2-like covalent binding of phosphatidylethanolamine to the C-
CC       terminal Gly of ATG8. The ATG12-ATG5 conjugate plays a role of an E3
CC       and promotes the transfer of ATG8 from ATG3 to phosphatidylethanolamine
CC       (PE). This step is required for the membrane association of ATG8. The
CC       formation of the ATG8-phosphatidylethanolamine conjugate is essential
CC       for autophagy and for the cytoplasm to vacuole transport (Cvt). The
CC       ATG8-PE conjugate mediates tethering between adjacent membranes and
CC       stimulates membrane hemifusion, leading to expansion of the
CC       autophagosomal membrane during autophagy (By similarity).
CC       {ECO:0000250}.
CC   -!- SUBUNIT: Monomer. Interacts with ATG8 through an intermediate thioester
CC       bond through the C-terminal Gly of ATG8. Also interacts with the 40
CC       amino acid C-terminal region of the E1-like ATG7 enzyme. Interacts also
CC       with the ATG12-ATG5 conjugate. {ECO:0000250}.
CC   -!- SUBCELLULAR LOCATION: Cytoplasm {ECO:0000250}.
CC   -!- DOMAIN: The N-terminal region is involved in phosphatidylethanolamine-
CC       binding and is required for ATG8-PE conjugation. {ECO:0000250}.
CC   -!- DOMAIN: The flexible region (FR) is required for ATG7-binding.
CC       {ECO:0000250}.
CC   -!- DOMAIN: The handle region (HR) contains the ATG8 interaction motif
CC       (AIM) and mediates binding to ATG8. It is crucial for the cytoplasm-to-
CC       vacuole targeting pathway (By similarity). {ECO:0000250}.
CC   -!- SIMILARITY: Belongs to the ATG3 family. {ECO:0000305}.
CC   -!- SEQUENCE CAUTION:
CC       Sequence=EDK40595.2; Type=Erroneous initiation; Evidence={ECO:0000305};
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DR   EMBL; CH408160; EDK40595.2; ALT_INIT; Genomic_DNA.
DR   RefSeq; XP_001482738.1; XM_001482688.1.
DR   AlphaFoldDB; A5DN42; -.
DR   SMR; A5DN42; -.
DR   STRING; 4929.XP_001482738.1; -.
DR   EnsemblFungi; EDK40595; EDK40595; PGUG_04693.
DR   GeneID; 5124746; -.
DR   KEGG; pgu:PGUG_04693; -.
DR   eggNOG; KOG2981; Eukaryota.
DR   HOGENOM; CLU_027518_2_0_1; -.
DR   InParanoid; A5DN42; -.
DR   OrthoDB; 1432328at2759; -.
DR   Proteomes; UP000001997; Unassembled WGS sequence.
DR   GO; GO:0005737; C:cytoplasm; IEA:UniProtKB-SubCell.
DR   GO; GO:0019787; F:ubiquitin-like protein transferase activity; IEA:InterPro.
DR   GO; GO:0006914; P:autophagy; IEA:UniProtKB-KW.
DR   GO; GO:0015031; P:protein transport; IEA:UniProtKB-KW.
DR   InterPro; IPR007135; Atg3/Atg10.
DR   PANTHER; PTHR12866; PTHR12866; 1.
DR   Pfam; PF03987; Autophagy_act_C; 1.
PE   3: Inferred from homology;
KW   Autophagy; Cytoplasm; Protein transport; Reference proteome; Transport;
KW   Ubl conjugation pathway.
FT   CHAIN           1..293
FT                   /note="Autophagy-related protein 3"
FT                   /id="PRO_0000317827"
FT   REGION          82..149
FT                   /note="Flexible region"
FT                   /evidence="ECO:0000250"
FT   REGION          222..268
FT                   /note="Handle region"
FT                   /evidence="ECO:0000250"
FT   ACT_SITE        218
FT                   /note="Glycyl thioester intermediate"
FT                   /evidence="ECO:0000250"
SQ   SEQUENCE   293 AA;  33617 MW;  769B006117D4184F CRC64;
     MLRSKLSSLR EYLTPINHNS NYETSGEISP EEFVQAGDYL VYKFPTWQWG SAPKKLQKDF
     LPPDKQFLIT KHVPSYQRAQ SYLGNTEDLA EDEEELDDGW VKSHRLTHED PKRDIATDKK
     VPDIEDLDDF IDEDAEDADG EEFQDLGNSN LRRYDLYITY STSYRVPKMY LVGFNDNGIP
     LLPHQMFEDI SGDYRDKTAT IENLPVSFNT TSVSIHPCKH SSVMKVLMKH AKTSREKARE
     FEPEAFVTGE NLEPATETTQ DTGIRVDQYL VVFLKFIASV TPGIGYDYTM DAL