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• Types (3 types)
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1l7v » ABC transporter BtuCD, symmetric structure

• Type: 1. Transmembrane (3 classes)
• Class: 1.1. Alpha-helical polytopic (72 superfamilies)
• Superfamily: 1.1.10. ABC transporters (5 families) 3.A.1 (TCDB)
• Family: 1.1.10.01. FecCD transport family (6 proteins) 3.A.1.14 (TCDB)
• Species: Escherichia coli (178 proteins)
• Localization: Bacterial Gram-negative inner membrane (269 proteins)

1l7v » ABC transporter BtuCD, symmetric structure
Hydrophobic Thickness	30.7 ± 1.1 Å
Tilt Angle	0 ± 1°
ΔGtransfer	-121.0 kcal/mol
Links to 1l7v	PDB Sum, PDB, SCOP, MSD, OCA, MMDB
Topology	subunit A (N-terminus in)
Resolution	3.20 Å
Other PDB entries of this protein	none
Number of TM Secondary Structures	22

2 transmembrane subunits
A - Tilt: 8° - Segments: 1(15-32), 2(56-78), 3(92-107), 4(114-133), 5(145-166), 6(174-180), 7(191-206), 8(233-249), 9(255-264), 10(275-296), 11(305-321)
B - Tilt: 8° - Segments: 1(15-32), 2(56-78), 3(92-107), 4(114-133), 5(145-166), 6(174-180), 7(191-206), 8(233-249), 9(255-264), 10(275-296), 11(305-322)

Comments on 1l7v » ABC transporter BtuCD, symmetric structure
Part of the ABC transporter complex btuCDF involved in vitamin B12 import. Responsible for energy coupling to the transport system. The complex is composed of two ATP-binding proteins (btuD), two transmembrane proteins (btuC) and a solute-binding protein (btuF - not present in the crystal structure).

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University of Michigan, Ann Arbor, MI 48109 USA