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3.A.1.3.27
Basic amino acid uptake porter, ArtIQ2N2. Transports Arginine, lysine and histidine.  Several 3-d structures have been solved (4YMS, 4YMT, 4YMU, etc., Yu et al. 2015).  These revealed one binding site for substrate per ArtQ monomer.  Heuveling et al. 2018 then showed that in the close homologue, ArtMP of Geobacillus stearothermophilus, that just one of these two sites needed to bind substrate to get transport.

Accession Number:Q8RCC4
Protein Name:ABC-type amino acid transport system, periplasmic component
Length:260
Molecular Weight:28849.00
Species:Caldanaerobacter subterraneus subsp. tengcongensis (strain DSM 15242 / JCM 11007 / NBRC 100824 / MB4) [273068]
Number of TMSs:1
Substrate Glutamine, glutamate, Asparagine

Cross database links:

Structure:
4YMX     

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Predict TMSs (Predict number of transmembrane segments)
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FASTA formatted sequence
1:	MNKKSLFLAF AVVFALAFML SGCGSKFNTV DQIKQKGVIV MGTSADFPPF EFHKVEGGKD 
61:	EIVGFDIDIA NAIAKKLGVK LEIKDMDFKG LIPALQAGRV DMVIAGMTPT AERKKSVDFS 
121:	DLYYDSRQVV VVKNDSPISK FDDLKVKTIA VQIGTTSEEA AKKIPNVKLK QLNRVSDEFM 
181:	DLQNGRCDAI VVEDTVAKAY LKEYKDMKIL YMDEINNVEN GSAVAVAKGN KSLLDVVNEV 
241:	IKELKQSGEY DKLVDKWFKQ