ID   DB126_PONPY             Reviewed;         118 AA.
AC   A4H244;
DT   29-MAY-2007, integrated into UniProtKB/Swiss-Prot.
DT   01-MAY-2007, sequence version 1.
DT   25-MAY-2022, entry version 36.
DE   RecName: Full=Beta-defensin 126;
DE   AltName: Full=Defensin, beta 126;
DE   Flags: Precursor;
GN   Name=DEFB126;
OS   Pongo pygmaeus (Bornean orangutan).
OC   Eukaryota; Metazoa; Chordata; Craniata; Vertebrata; Euteleostomi; Mammalia;
OC   Eutheria; Euarchontoglires; Primates; Haplorrhini; Catarrhini; Hominidae;
OC   Pongo.
OX   NCBI_TaxID=9600;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [GENOMIC DNA].
RA   Hollox E.J., Armour J.A.L.;
RT   "Evolution and sequence variation of human beta-defensin genes.";
RL   Submitted (NOV-2006) to the EMBL/GenBank/DDBJ databases.
CC   -!- FUNCTION: Highly glycosylated atypical beta-defensin involved in
CC       several aspects of sperm function. Facilitates sperm transport in the
CC       female reproductive tract and contributes to sperm protection against
CC       immunodetection; both functions are probably implicating the negative
CC       surface charge provided by its O-linked oligosaccharides in the sperm
CC       glycocalyx. Involved in binding of sperm to oviductal epithelial cells
CC       to form a sperm reservoir until ovulation. Release from the sperm
CC       surface during capacitation and ovaluation by an elevation of oviductal
CC       fluid pH is unmasking other surface components and allows sperm to
CC       penetrate the cumulus matrix and bind to the zona pellucida of the
CC       oocyte. In vitro has antimicrobial activity and may inhibit LPS-
CC       mediated inflammation (By similarity). {ECO:0000250|UniProtKB:Q9BEE3,
CC       ECO:0000250|UniProtKB:Q9BYW3}.
CC   -!- SUBUNIT: Homodimer or homooligomer; disulfide-linked.
CC       {ECO:0000250|UniProtKB:Q9BEE3}.
CC   -!- SUBCELLULAR LOCATION: Secreted {ECO:0000250|UniProtKB:Q9BEE3}.
CC       Note=Secreted by epididymal cells and is absorbed to the surface of
CC       sperm during transit through the epididymis.
CC       {ECO:0000250|UniProtKB:Q9BEE3}.
CC   -!- PTM: O-glycosylated; glycans contain alpha(2,3)-linked sialic acids (By
CC       similarity). {ECO:0000250|UniProtKB:Q9BEE3,
CC       ECO:0000250|UniProtKB:Q9BYW3}.
CC   -!- SIMILARITY: Belongs to the beta-defensin family. {ECO:0000305}.
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DR   EMBL; AM410149; CAL68959.1; -; Genomic_DNA.
DR   AlphaFoldDB; A4H244; -.
DR   GO; GO:0005576; C:extracellular region; IEA:UniProtKB-SubCell.
DR   GO; GO:0042742; P:defense response to bacterium; IEA:UniProtKB-KW.
DR   GO; GO:0045087; P:innate immune response; IEA:InterPro.
DR   GO; GO:0007338; P:single fertilization; IEA:UniProtKB-KW.
DR   InterPro; IPR025933; Beta_defensin.
DR   Pfam; PF13841; Defensin_beta_2; 1.
PE   3: Inferred from homology;
KW   Antibiotic; Antimicrobial; Cleavage on pair of basic residues; Defensin;
KW   Disulfide bond; Fertilization; Secreted; Signal.
FT   SIGNAL          1..20
FT                   /evidence="ECO:0000255"
FT   CHAIN           21..118
FT                   /note="Beta-defensin 126"
FT                   /id="PRO_0000436303"
FT   REGION          21..63
FT                   /note="In vitro binds to LPS, mediates antimicrobial
FT                   activity and inhibits LPS-mediated inflammation"
FT                   /evidence="ECO:0000250|UniProtKB:Q9BYW3"
FT   DISULFID        27..58
FT                   /evidence="ECO:0000250|UniProtKB:P59665"
FT   DISULFID        34..52
FT                   /evidence="ECO:0000250|UniProtKB:P59665"
FT   DISULFID        38..59
FT                   /evidence="ECO:0000250|UniProtKB:P59665"
FT   DISULFID        72
FT                   /note="Interchain"
FT                   /evidence="ECO:0000250|UniProtKB:Q9BEE3"
SQ   SEQUENCE   118 AA;  12794 MW;  2D2B705F3A7186C6 CRC64;
     MKSLLFTLAV FMLLAQLVSG SWYVKKCLND VGICKKKCKP EELHVKNGWA MCGKQRDCCV
     PADKRANYPA FCVQTKTTRT STVTATTATR ATTATTTTLM MTTASMSSMT PTPVSPTG