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2.A.2.4.2
Phloem-localized sucrose:H+ symporter, Sut1 (mediates sucrose uptake or efflux dependent on the sucrose gradient and the pmf; Carpaneto et al., 2005). Sut1 is a sucrose protein symporter. Protons can move in the absence of sucrose (Carpaneto et al., 2010), but upon addition of sucrose, it becomes a symporter.  Arg-188 in the rice orthologue and homologues are essential (Sun and Ward 2012).

Accession Number:Q9SXM0
Protein Name:Sucrose Transporter
Length:521
Molecular Weight:55175.00
Species:Zea mays (Maize) [4577]
Number of TMSs:12
Location1 / Topology2 / Orientation3: Mitochondrion membrane1 / Single-pass membrane protein2
Substrate hydron, sucrose

Cross database links:

RefSeq: NP_001104840.1   
Entrez Gene ID: 541615   
KEGG: zma:541615   

Gene Ontology

GO:0005887 C:integral to plasma membrane
GO:0008515 F:sucrose transmembrane transporter activity
GO:0015770 P:sucrose transport

References (1)

[1] “Molecular cloning and expression analysis of a gene for a sucrose transporter in maize (Zea mays L.).”  Aoki N.et.al.   10589520

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Predict TMSs (Predict number of transmembrane segments)
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FASTA formatted sequence 
1:	MARGDGELEL SVGVRGTGGA AAAAAADHVA PISLGRLILA GMVAGGVQYG WALQLSLLTP 
61:	YVQTLGLSHA LTSFMWLCGP IAGLVVQPLV GLYSDRCTAR WGRRRPFILI GCMLICLAVI 
121:	VVGFSSDIGA ALGDTKEHCS LYHGPRWHAA IVYVLGFWLL DFSNNTVQGP ARAMMADLCG 
181:	HHGPSAANSI FCSWMALGNI LGYSSGSTNN WHKWFPFLLT NACCEACANL KGAFLVAVVF 
241:	LVMCLTVTLF FANEVPYRGN QNLPTKANGE VETEPSGPLA VLKGFKNLPT GMPSVLLVTG 
301:	LTWLSWFPFI LYDTDWMGRE IYHGDPKGSN AQISAFDEGV RVGSFGLLLN SIVLGFSSFL 
361:	IEPMCRKVGP RVVWVTSNFM VCVAMAATAL ISFWSLKDYH GYVQDAITAS TSIKAVCLVL 
421:	FAFLGVPLAI LYSVPFAVTA QLAATKGGGQ GLCTGVLNIS IVIPQVIIAL GAGPWDALFG 
481:	KGNIPAFGVA SGFALIGGVV GVFLLPKISK RQFRAVSAGG H