Table 1.

Summary of the structures of five group of membrane proteins determined using detergent and detergent-free systems

Group of proteins	Proteins	PDB/EMD	Function	Oligomeric states	Expression system	Species	Methods
AcrB and homologs	AcrB	6BAJ/7074	Transporter	Trimer	E.coli	E.coli	NCMN system
	MtrDB	6VKS/21228	Transporter	Trimer	E.coli	N. onorrhoeae	Nanodisc
	AcrB	6Z12/4460	Transporter	Trimer	E.coli	S. enterica	SMALP
	AcrB	6SGU/10185	Transporter	Trimer	E.coli	E.coli	Saposin
	AcrB	7B5P/12043	Transporter	Trimer	E.coli	E.coli	CyclAPol
	AcrB	1IWG	Transporter	Trimer	E.coli	E.coli	Detergent
Alternative complexes	ACIII	6BTM/7286	Enzyme	Heterohexamer	F. johnsoniae	F. johnsoniae	SMALP
	ACIII	6LOD/0936	Enzyme	Heterohexamer	R. castenholzii	R. astenholzii	Detergent
	ACIII	6F0K/4165	Enzyme	Heterohexmer	R. marinus	R. marinus	Detergent
KimA	KimA	6S3K/10092	Transporter	Homodimer	E.coli	B. subtilis	SMALP
YnaI	YnaI	6ZYD/11557	Channel	Homoheptamer	E.coli	E.coli	DIBMA
	YnaI	6ZYE/11560	Channel	Homoheptamer	E.coli	E.coli	DIBMA
	YnaI	6URT/20862	Channel	Homoheptamer	E.coli	E.coli	Detergent
Glycine receptor	Glycine receptor	6PLZ/20381	Receptor/Channel	Homopentamer	S. frugiperda	D. rerio	SMALP
		6PXD/20518	Receptor/Channel	Homopentamer	S. frugiperda	D. rerio	Detergent
		6PLS/20374	Receptor/Channel	Homopentamer	S. frugiperda	D. rerio	Nonodisc