Protein: Potassium channel subfamily U member 1 (A8MYU2)
Organism: Homo sapiens (Human)
Function: Testis-specific potassium channel activated by both intracellular pH and membrane voltage that mediates export of K(+). Represents the primary spermatozoan K(+) current. The channel underlies a pH-triggered membrane hyperpolarization during the process of sperm capacitation, as sperm encounter the alkaline environment near the ovum in the female reproductive tract, thereby playing an essential for male fertility
Subcellular location: Cell membrane; Multi-pass membrane protein. Cell projection, cilium, flagellum membrane; Multi-pass membrane protein
Sequence: MFQTKLRNETWEDLPKMSCTTEIQAAFILSSFVTFFSGLIILLIFRLIWRSVKKWQIIKGTGIILELFTSGTIARSHVRSLHFQGQFRDHIEMLLSAQTFVGQVLVILVFVLSIGSLIIYFINSADPVGSCSSYEDKTIPIDLVFNAFFSFYFGLRFMAADDKIKFWLEMNSIVDIFTIPPTFISYYLKSNWLGLRFLRALRLLELPQILQILRAIKTSNSVKFSKLLSIILSTWFTAAGFIHLVENSGDPWLKGRNSQNISYFESIYLVMATTSTVGFGDVVAKTSLGRTFIMFFTLGSLILFANYIPEMVELFANKRKYTSSYEALKGKKFIVVCGNITVDSVTAFLRNFLRDKSGEINTEIVFLGETPPSLELETIFKCYLAYTTFISGSAMKWEDLRRVAVESAEACLIIANPLCSDSHAEDISNIMRVLSIKNYDSTTRIIIQILQSHNKVYLPKIPSWNWDTGDNIICFAELKLGFIAQGCLVPGLCTFLTSLFVEQNKKVMPKQTWKKHFLNSMKNKILTQRLSDDFAGMSFPEVARLCFLKMHLLLIAIEYKSLFTDGFCGLILNPPPQVRIRKNTLGFFIAETPKDVRRALFYCSVCHDDVFIPELITNCGCKSRSRQHITVPSVKRMKKCLKGISSRISGQDSPPRVSASTSSISNFTTRTLQHDVEQDSDQLDSSGMFHWCKPTSLDKVTLKRTGKSKYKFRNHIVACVFGDAHSAPMGLRNFVMPLRASNYTRKELKDIVFIGSLDYLQREWRFLWNFPQIYILPGCALYSGDLHAANIEQCSMCAVLSPPPQPSSNQTLVDTEAIMATLTIGSLQIDSSSDPSPSVSEETPGYTNGHNEKSNCRKVPILTELKNPSNIHFIEQLGGLEGSLQETNLHLSTAFSTGTVFSGSFLDSLLATAFYNYHVLELLQMLVTGGVSSQLEQHLDKDKVYGVADSCTSLLSGRNRCKLGLLSLHETILSDVNPRNTFGQLFCGSLDLFGILCVGLYRIIDEEELNPENKRFVITRPANEFKLLPSDLVFCAIPFSTACYKRNEEFSLQKSYEIVNKASQTTETHSDTNCPPTIDSVTETLYSPVYSYQPRTNSLSFPKQIAWNQSRTNSIISSQIPLGDNAKENERKTSDEVYDEDPFAYSEPL
InterPro domains: - IPR003929: Calcium-activated potassium channel BK, alpha subunit (domain) [470-557]
- IPR047871: Calcium-activated potassium channel slowpoke-like (family) [16-1051]
- IPR005821: Ion transport domain (domain) [106-322]
- IPR048735: Ca2+-activated K+ channel Slowpoke-like, C-terminal domain (domain) [919-1037]
- IPR003148: Regulator of K+ conductance, N-terminal lobe (domain) [330-884]
Interaction partners: - Calcium-activated potassium channel subunit beta-4
- Small conductance calcium-activated potassium channel protein 1
- Intermediate conductance calcium-activated potassium channel protein 4
- Calcium-activated potassium channel subunit beta-1
- Small conductance calcium-activated potassium channel protein 2
- Small conductance calcium-activated potassium channel protein 3
- cAMP-dependent protein kinase catalytic subunit gamma
- cAMP-dependent protein kinase catalytic subunit alpha
- cAMP-dependent protein kinase catalytic subunit beta
- Calcium-activated potassium channel subunit beta-3
Gene Ontology annotations:
Molecular Function (MF): GO:0003674 (molecular function), GO:0005488 (binding), GO:0005215 (transporter activity), GO:0022857 (transmembrane transporter activity), GO:0005515 (protein binding), GO:0015075 (monoatomic ion transmembrane transporter activity), GO:0022803 (passive transmembrane transporter activity), GO:1901702 (salt transmembrane transporter activity), GO:0015318 (inorganic molecular entity transmembrane transporter activity), GO:0015079 (potassium ion transmembrane transporter activity), GO:0015267 (channel activity), GO:0008324 (monoatomic cation transmembrane transporter activity), GO:0005216 (monoatomic ion channel activity), GO:0022890 (inorganic cation transmembrane transporter activity), GO:0046873 (metal ion transmembrane transporter activity), GO:0005261 (monoatomic cation channel activity), GO:0022839 (monoatomic ion gated channel activity), GO:0005267 (potassium channel activity), GO:0022836 (gated channel activity), GO:0022843 (voltage-gated monoatomic cation channel activity), GO:0005244 (voltage-gated monoatomic ion channel activity), GO:0005249 (voltage-gated potassium channel activity), GO:0005227 (calcium activated cation channel activity), GO:0022832 (voltage-gated channel activity), GO:0015269 (calcium-activated potassium channel activity)
Biological Process (BP): GO:0008150 (biological process), GO:0009987 (cellular process), GO:0051179 (localization), GO:0051234 (establishment of localization), GO:0055085 (transmembrane transport), GO:0140352 (export from cell), GO:0140115 (export across plasma membrane), GO:0034220 (monoatomic ion transmembrane transport), GO:0098660 (inorganic ion transmembrane transport), GO:0006810 (transport), GO:0098655 (monoatomic cation transmembrane transport), GO:0097623 (potassium ion export across plasma membrane), GO:0098662 (inorganic cation transmembrane transport), GO:0006811 (monoatomic ion transport), GO:0071805 (potassium ion transmembrane transport), GO:0006812 (monoatomic cation transport), GO:0030001 (metal ion transport), GO:0006813 (potassium ion transport)
Cellular Component (CC): GO:0005575 (cellular component), GO:0110165 (cellular anatomical entity), GO:0005622 (intracellular anatomical structure), GO:0043226 (organelle), GO:0016020 (membrane), GO:0005737 (cytoplasm), GO:0012505 (endomembrane system), GO:0031984 (organelle subcompartment), GO:0042175 (nuclear outer membrane-endoplasmic reticulum membrane network), GO:0031090 (organelle membrane), GO:0005783 (endoplasmic reticulum), GO:0043229 (intracellular organelle), GO:0043227 (membrane-bounded organelle), GO:0098827 (endoplasmic reticulum subcompartment), GO:0043231 (intracellular membrane-bounded organelle), GO:0005789 (endoplasmic reticulum membrane)