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1.A.25.2.3
Pannexin-3, PANX3, of 392 aas and 5 TMSs, is reported to form functional, single membrane, cell surface channels (Penuela et al., 2007)). It functions as an ER Ca2+ channel, hemichannel, and gap junction to promote osteoblast differentiation (Ishikawa et al., 2011). However, Panx3 expression in osteoblasts is not required for postnatal bone remodeling (Yorgan et al. 2019).

Accession Number:Q96QZ0
Protein Name:Pannexin-3 aka PANX3
Length:392
Molecular Weight:44683.00
Species:Homo sapiens (Human) [9606]
Number of TMSs:5
Location1 / Topology2 / Orientation3: Cell membrane1 / Multi-pass membrane protein2
Substrate calcium(2+)

Cross database links:

RefSeq: NP_443191.1   
Entrez Gene ID: 116337   
Pfam: PF00876   
OMIM: 608422  gene
KEGG: hsa:116337   

Gene Ontology

GO:0005921 C:gap junction
GO:0016021 C:integral to membrane

References (1)

[1] “The mammalian pannexin family is homologous to the invertebrate innexin gap junction proteins.”  Baranova A.et.al.   15028292

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Predict TMSs (Predict number of transmembrane segments)
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FASTA formatted sequence 
1:	MSLAHTAAEY MLSDALLPDR RGPRLKGLRL ELPLDRIVKF VAVGSPLLLM SLAFAQEFSS 
61:	GSPISCFSPS NFSIRQAAYV DSSCWDSLLH HKQDGPGQDK MKSLWPHKAL PYSLLALALL 
121:	MYLPVLLWQY AAVPALSSDL LFIISELDKS YNRSIRLVQH MLKIRQKSSD PYVFWNELEK 
181:	ARKERYFEFP LLERYLACKQ RSHSLVATYL LRNSLLLIFT SATYLYLGHF HLDVFFQEEF 
241:	SCSIKTGLLS DETHVPNLIT CRLTSLSIFQ IVSLSSVAIY TILVPVIIYN LTRLCRWDKR 
301:	LLSVYEMLPA FDLLSRKMLG CPINDLNVIL LFLRANISEL ISFSWLSVLC VLKDTTTQKH 
361:	NIDTVVDFMT LLAGLEPSKP KHLTNSACDE HP