TY  - BOOK
AU  - Choi,Hyun-Kyu
AU  - Kang,Hyunook
AU  - Lee,Chanwoo
AU  - Kim,Hyun Gyu
AU  - Phillips,Ben P.
AU  - Park,Soohyung
AU  - Tumescheit,Charlotte
AU  - Kim,Sang Ah
AU  - Lee,Hansol
AU  - Roh,Soung-Hun
AU  - Hong,Heedeok
AU  - Steinegger,Martin
AU  - Im,Wonpil
AU  - Miller,Elizabeth A.
AU  - Choi,Hee-Jung
AU  - Yoon,Tae-Young
TI  - Evolutionary balance between foldability and functionality of a glucose transporter
PY  - 2022///-07-01
KW  - Text
KW  - local
N1  - /pmc/articles/PMC7612945; /pubmed/35484435
N2  - Despite advances in resolving structures of multi-pass membrane proteins, little is known about the native folding pathways of these complex structures. Using single-molecule magnetic tweezers, we here report a folding pathway of purified human glucose transporter 3 (GLUT3) reconstituted within synthetic lipid bilayers. The N-terminal major facilitator superfamily (MFS) fold strictly forms first, serving as structural templates for its C-terminal counterpart, in which polar residues comprising the conduit for glucose molecules present major folding challenges. The ER membrane protein complex facilitates insertion of these hydrophilic transmembrane helices, thrusting GLUT3's microstate sampling toward folded structures. Final assembly between the N- and C-terminal MFS folds depends on specific lipids that ease desolvation of lipid shells surrounding the domain interfaces. Sequence analysis suggests that this asymmetric folding propensity across the N-and C-terminal MFS folds prevails for metazoan sugar porters, revealing evolutionary conflicts between foldability and functionality faced by many multi-pass membrane proteins
UR  - http://dx.doi.org/10.1038/s41589-022-01002-w
ER  -