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1.A.8.12.3
The boric acid channel protein, NIP5;1 (expressed in the root elongation zone and root hairs in response to boron deficiency) (Takano et al., 2006).  Borate is an essential nutrient in plants.     The ortholog in Brassica napus ( XP_013652160.1) is 301 aas in length with 6 TMSs and is 90% identical to the A. thaliana protein.  Synthesis of the B. napus protein is induced in roots and shoots by a borate deficiency (Diehn et al. 2019). NIP2, 3, 4, 6 and 7 can also transport boric acid (Diehn et al. 2019). the grape ortholog can transport the same molecules (Sabir et al. 2020).

Accession Number:Q9SV84
Protein Name:Probable aquaporin NIP5-1
Length:304
Molecular Weight:31493.00
Species:Arabidopsis thaliana (Mouse-ear cress) [3702]
Number of TMSs:6
Location1 / Topology2 / Orientation3: Cell membrane1 / Multi-pass membrane protein2
Substrate inorganic anion, boric acid

Cross database links:

RefSeq: NP_192776.1   
Entrez Gene ID: 826630   
Pfam: PF00230   
KEGG: ath:AT4G10380   

Gene Ontology

GO:0016021 C:integral to membrane
GO:0005886 C:plasma membrane
GO:0015105 F:arsenite transmembrane transporter activity
GO:0046715 F:boron transmembrane transporter activity
GO:0080138 F:boron uptake transmembrane transporter acti...
GO:0015250 F:water channel activity
GO:0015700 P:arsenite transport
GO:0046713 P:boron transport
GO:0080029 P:cellular response to boron levels
GO:0046685 P:response to arsenic

References (3)

[1] “Sequence and analysis of chromosome 4 of the plant Arabidopsis thaliana.”  Mayer K.F.X.et.al.   10617198
[2] “From genome to function: the Arabidopsis aquaporins.”  Quigley F.et.al.   11806824
[3] “The Arabidopsis major intrinsic protein NIP5;1 is essential for efficient boron uptake and plant development under boron limitation.”  Takano J.et.al.   16679457

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Predict TMSs (Predict number of transmembrane segments)
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FASTA formatted sequence 
1:	MAPPEAEVGA VMVMAPPTPG TPGTPGGPLI TGMRVDSMSF DHRKPTPRCK CLPVMGSTWG 
61:	QHDTCFTDFP SPDVSLTRKL GAEFVGTFIL IFTATAGPIV NQKYDGAETL IGNAACAGLA 
121:	VMIIILSTGH ISGAHLNPSL TIAFAALRHF PWAHVPAYIA AQVSASICAS FALKGVFHPF 
181:	MSGGVTIPSV SLGQAFALEF IITFILLFVV TAVATDTRAV GELAGIAVGA TVMLNILVAG 
241:	PSTGGSMNPV RTLGPAVASG NYRSLWVYLV APTLGAISGA AVYTGVKLND SVTDPPRPVR 
301:	SFRR