7P16 | pdb_00007p16

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
B	Trypsin	e7p16B1	A: alpha bundles	X: CNF1/YfiH-like putative cysteine hydrolases	H: RIFT-related	T: FMN-binding split barrel 2	F: Trypsin	ECOD (develop294)

Chain	Chain Class	Chain Subclass	Chain Type	Antigen Name(s)	Provenance Source
B	Heavy Chain	IGHV1	-	xk-related protein	SAbDab (2026-03-20)

Chains	Accession	Name	Description	Comments	Source
A	PF09815	XK-related protein (XK-related)	XK-related protein	-	Family

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
B	Sybody	-	-	-
A	XK-related protein	lipid transporter activity intramembrane lipid transporter activity transporter activity phospholipid scramblase activity phospholipid transporter activity	phospholipid translocation transport phospholipid transport plasma membrane phospholipid scrambling cellular component organization localization execution phase of apoptosis phosphatidylserine exposure on apoptotic cell surface plasma membrane organization cellular component organization or biogenesis regulation of biological quality endomembrane system organization membrane organization biological regulation phospholipid translocation transport phospholipid transport plasma membrane phospholipid scrambling cellular component organization localization execution phase of apoptosis phosphatidylserine exposure on apoptotic cell surface plasma membrane organization cellular component organization or biogenesis regulation of biological quality endomembrane system organization membrane organization biological regulation lipid localization lipid transport cell death lipid translocation establishment of localization regulation of membrane lipid distribution macromolecule localization cellular process apoptotic process programmed cell death organophosphate ester transport	cell periphery cellular anatomical structure plasma membrane membrane

Chains	Accession	Name	Type
A	IPR018629	XK-related protein	Family
A	IPR050895	XK-related phospholipid scramblase	Family

Chains	External Link	Type	Class	Superfamily	Family
A	OPM	Transmembrane	Alpha-helical polytopic	KX blood-group antigen family	KX blood-group antigen family

Chains	External Link	Comment
A	PDBTM	Annotated as membrane protein by PDBTM

Chains	External Link	Comment
A	MemProtMD	Annotated as membrane protein by MemProtMD

Chains	Resource Link	Group	Subgroup	Protein
A	mpstruc	TRANSMEMBRANE PROTEINS: ALPHA-HELICAL	XKR Family of Proteins	XKR9 lipid scramblase, full length with synthetic nanobody

RCSB PDB Core Operations are funded by the U.S. National Science Foundation (DBI-2321666), the US Department of Energy (DE-SC0019749), and the National Cancer Institute, National Institute of Allergy and Infectious Diseases, and National Institute of General Medical Sciences of the National Institutes of Health under grant R01GM157729. RCSB PDB uses resources of the National Energy Research Scientific Computing Center (NERSC), a Department of Energy User Facility.

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