9boi

Structural highlights

Function

MALE_ECOLI Involved in the high-affinity maltose membrane transport system MalEFGK. Initial receptor for the active transport of and chemotaxis toward maltooligosaccharides.SPNS1_HUMAN Plays a critical role in the phospholipid salvage pathway from lysosomes to the cytosol (PubMed:36161949, PubMed:37075117). Mediates the rate-limiting, proton-dependent, lysosomal efflux of lysophospholipids, which can then be reacylated by acyltransferases in the endoplasmic reticulum to form phospholipids (PubMed:36161949, PubMed:37075117). Selective for zwitterionic headgroups such as lysophosphatidylcholine (LPC) and lysophosphatidylethanolamine (LPE), can also transport lysophosphatidylglycerol (LPG), but not other anionic lysophospholipids, sphingosine, nor sphingomyelin (PubMed:36161949). Transports lysophospholipids with saturated, monounsaturated, and polyunsaturated fatty acids, such as 1-hexadecanoyl-sn-glycero-3-phosphocholine, 1-(9Z-octadecenoyl)-sn-glycero-3-phosphocholine and 1-(4Z,7Z,10Z,13Z,16Z,19Z-docosahexaenoyl)-sn-glycero-3-phosphocholine, respectively (PubMed:36161949, PubMed:37075117). Can also transport lysoplasmalogen (LPC with a fatty alcohol) such as 1-(1Z-hexadecenyl)-sn-glycero-3-phosphocholine (PubMed:36161949). Lysosomal LPC could function as intracellular signaling messenger (PubMed:37075117). Essential player in lysosomal homeostasis (PubMed:36161949). Crucial for cell survival under conditions of nutrient limitation (PubMed:37075117). May be involved in necrotic or autophagic cell death (PubMed:12815463).^{[1] [2] [3] [4]} GFP_AEQVI Energy-transfer acceptor. Its role is to transduce the blue chemiluminescence of the protein aequorin into green fluorescent light by energy transfer. Fluoresces in vivo upon receiving energy from the Ca(2+)-activated photoprotein aequorin.

References

1. ↑ Yanagisawa H, Miyashita T, Nakano Y, Yamamoto D. HSpin1, a transmembrane protein interacting with Bcl-2/Bcl-xL, induces a caspase-independent autophagic cell death. Cell Death Differ. 2003 Jul;10(7):798-807. PMID:12815463 doi:10.1038/sj.cdd.4401246
2. ↑ He M, Kuk ACY, Ding M, Chin CF, Galam DLA, Nah JM, Tan BC, Yeo HL, Chua GL, Benke PI, Wenk MR, Ho L, Torta F, Silver DL. Spns1 is a lysophospholipid transporter mediating lysosomal phospholipid salvage. Proc Natl Acad Sci U S A. 2022 Oct 4;119(40):e2210353119. PMID:36161949 doi:10.1073/pnas.2210353119
3. ↑ Scharenberg SG, Dong W, Ghoochani A, Nyame K, Levin-Konigsberg R, Krishnan AR, Rawat ES, Spees K, Bassik MC, Abu-Remaileh M. An SPNS1-dependent lysosomal lipid transport pathway that enables cell survival under choline limitation. Sci Adv. 2023 Apr 21;9(16):eadf8966. PMID:37075117 doi:10.1126/sciadv.adf8966
4. ↑ Scharenberg SG, Dong W, Ghoochani A, Nyame K, Levin-Konigsberg R, Krishnan AR, Rawat ES, Spees K, Bassik MC, Abu-Remaileh M. An SPNS1-dependent lysosomal lipid transport pathway that enables cell survival under choline limitation. Sci Adv. 2023 Apr 21;9(16):eadf8966. PMID:37075117 doi:10.1126/sciadv.adf8966