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3.A.1.1.27
Maltose/Maltotriose/maltodextrin (up to 7 glucose units) transporters MalXFGK (MsmK (3.A.1.1.28) can probably substitute for MalK; Webb et al., 2008).

Accession Number:Q8DT28
Protein Name:MalX
Length:415
Molecular Weight:45174.00
Species:Streptococcus mutans [1309]
Number of TMSs:1
Location1 / Topology2 / Orientation3: Membrane1 / Multi-pass membrane protein2
Substrate alpha,alpha-trehalose, maltose, alpha-maltotriose, maltotetraose

Cross database links:

RefSeq: NP_721907.1   
Entrez Gene ID: 1028671   
BioCyc: SMUT210007:SMU_1568-MONOMER   
KEGG: smu:SMU.1568   

References (1)

[1] “Genome sequence of Streptococcus mutans UA159, a cariogenic dental pathogen.”  Ajdic D.J.et.al.   12397186

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Predict TMSs (Predict number of transmembrane segments)
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FASTA formatted sequence
1:	MKTWQKIVVG GAGLMLASSI LVACGSKDSK SSSSDPKTIK LWVPTGAKKS YQSIVHKFEK 
61:	DSNYKVKIIE SEDPKAQEKI KKDPSTAADV FSLPHDQLGQ LVDSGVIQEI PQKYSKEINK 
121:	NETQQAATGA MYKGKTYAFP FGIESQVLYY NKSKLSADDV TSYETITSKA TFGAKFKQVN 
181:	AYATAPLFYS VGDTLFGKNG EDAKGTNWGN DAGVSVLKWI ASQKGNAGFV NLDDNNVMSK 
241:	FGDGSVASFE SGPWDYEAAQ KAVGKNNLGV TVYPTINING QEVQQKAFLG VKLYAVNQAP 
301:	SKGNTKRIAA SYKLASYLTS AESQENQFKT KGRNIIPSNK TVQNSDTVKN HELAQAVIQM 
361:	GSSSDYTVVM PKLNQMSTFW TESAAILSDT YNGKIKESDY LAKLKQFDKD LAAAK