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3.A.2.1.5
The Na+-F1F0 ATP synthase.  Has a hybrid rotor with 9 copies of an F0-like c-subunit with 1 ion binding site/2TMSs and 1 copy of a V0-like C1-subunit (with 1 ion binding site/4TMSs). The  AtpI Mg2+ channel protein (TC# 1.A.77.10.4) is required for assembly of the hybrid rotor (Brandt et al. 2013).

Accession Number:P50002
Protein Name:ATP synthase subunit beta, sodium ion specific
Length:466
Molecular Weight:50663.00
Species:Acetobacterium woodii (strain ATCC 29683 / DSM 1030 / JCM 2381 / KCTC 1655) [931626]
Location1 / Topology2 / Orientation3: Cell membrane1 / Peripheral membrane protein2
Substrate sodium(1+)

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Predict TMSs (Predict number of transmembrane segments)
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FASTA formatted sequence 
1:	MAQNIGKVVQ VIGPVVDVKF QKDKLPKLNN AVNIELNGHT LVIEVAQQLG DDIVRCIAMD 
61:	STDGLMRNQE AVDTGSAIQV PVGKATLGRM FNVLGEPIDG KPFDTKDVVM HPIHRHPPSF 
121:	EEQQTQPEMF ETGIKVVDLI CPYVRGGKIG LFGGAGVGKT VLIQELINNI ATQHGGLSVF 
181:	AGVGERTREG NDLYYEMMES GVINKTALCF GQMNEPPGAR MRIALAGLTM AEYFRDDEGQ 
241:	DVLLFIDNIF RFTQAGSEVS ALLGRMPSAV GYQPTLATEM GALQERITST SKGSITSVQA 
301:	VYVPADDLTD PAPATTFAHL DATTVLSRAI TEKGIYPAVD PLDSTSRILD PKIVGQEHYE 
361:	TAREVQEILQ RYKELQDIIA ILGMDELSDA DKITVSRARK VERFLSQPFN VAEQFTGTAG 
421:	VYVTIGDTIK GFKEILEGQH DDLPESAFLL VGTIEDAVVK AKKIKG