9DBQ

Cryo-EM structure of human ABCB6 transporter in an inward-facing conformation

Summary for 9DBQ

• Entry DOI: 10.2210/pdb9dbq/pdb
• EMDB information: 46724
• Descriptor: ATP-binding cassette sub-family B member 6, CHOLESTEROL HEMISUCCINATE (2 entities in total)
• Functional Keywords: transporter, atpase, membrane protein
• Biological source: Homo sapiens (human)
• Total number of polymer chains: 2
• Total formula weight: 199676.79

Authors

Shaik, M.M.,Myasnikov, A.,Oldham, M.L.,Baril, S.A.,Kalathur, R.C.,Schuetz, J.D. (deposition date: 2024-08-23, release date: 2024-11-20, Last modification date: 2024-12-04)

Primary citation

Baril, S.A.,Wilson, K.A.,Shaik, M.M.,Fukuda, Y.,Umans, R.A.,Barbieri, A.,Lynch, J.,Gose, T.,Myasnikov, A.,Oldham, M.L.,Wang, Y.,Zhu, J.,Fang, J.,Zuo, J.,Kalathur, R.C.,Ford, R.C.,Coffin, A.,Taylor, M.R.,O'Mara, M.L.,Schuetz, J.D.
The role of ATP-binding Cassette subfamily B member 6 in the inner ear.
Nat Commun, 15:9885-9885, 2024

PubMed Abstract: ABCB6 has been implicated in dyschromatosis universalis hereditaria, a condition characterized by hyperpigmented and hypopigmented skin macules. Dyschromatosis universalis hereditaria can also present with hearing loss. Dyschromatosis universalis hereditaria-associated mutations in ABCB6 have been reported, but the role of this protein in the inner ear has not been studied. Here we determine a high-resolution (2.93 Å) cryo-EM structure of ABCB6 and functionally characterized several dyschromatosis universalis hereditaria mutants. We find that the L356P mutant abolishes ABCB6 function, and affirm the underlying loss of ATP binding mechanism using molecular dynamics simulations based on our cryo-EM structure. To test the role of ABCB6 in the inner ear, we characterize Abcb6 (the ABCB6 homolog) in zebrafish. We show that Abcb6 suppression by morpholinos reduces inner ear and lateral line hair cell numbers. Morphants also lack the utricular otolith, which is associated with vestibular function. Co-injecting morpholinos with human ABCB6 mRNA partially rescues the morphant phenotype, suggesting that Abcb6 plays a developmental role in inner ear structures. Further, we show that Abcb6 knockout mice exhibit an increased auditory brainstem response threshold, resulting in reduced hearing sensitivity. Taken together, these data suggest ABCB6 plays a role in inner ear development and function.

PubMed: 39557842
DOI: 10.1038/s41467-024-53663-x

Experimental method

ELECTRON MICROSCOPY (2.9 Å)