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1.A.69.2.1
The insect heteromeric CO2 receptor: GR21a (Olfactory receptor 21a; 454 aas) GR63a (Olfactory receptor 63a; 512 aas) are coexpressed in antennal neurons of insects and together comprise the peripheral sensory receptor for CO2 (Ramdya and Benton, 2010). These proteins are members of the 7Tm-7 superfamily of putative 7TMS proteins.

Accession Number:Q9VPT1
Protein Name:Gustatory and odorant receptor 21a
Length:454
Molecular Weight:52773.00
Species:Drosophila melanogaster (Fruit fly) [7227]
Number of TMSs:7
Location1 / Topology2 / Orientation3: Cell membrane1 / Multi-pass membrane protein2
Substrate cation

Cross database links:

Entrez Gene ID: 33251   
Pfam: PF08395   
KEGG: dme:Dmel_CG1394   

Gene Ontology

GO:0030425 C:dendrite
GO:0016021 C:integral to membrane
GO:0043025 C:neuronal cell body
GO:0005886 C:plasma membrane
GO:0008527 F:taste receptor activity
GO:0007610 P:behavior
GO:0003031 P:detection of carbon dioxide
GO:0010037 P:response to carbon dioxide
GO:0007608 P:sensory perception of smell
GO:0050909 P:sensory perception of taste

References (5)

[1] “Two chemosensory receptors together mediate carbon dioxide detection in Drosophila.”  Jones W.D.et.al.   17167414
[2] “The genome sequence of Drosophila melanogaster.”  Adams M.D.et.al.   10731132
[3] “Annotation of the Drosophila melanogaster euchromatic genome: a systematic review.”  Misra S.et.al.   12537572
[4] “Candidate taste receptors in Drosophila.”  Clyne P.J.et.al.   10710312
[5] “Spatially restricted expression of candidate taste receptors in the Drosophila gustatory system.”  Dunipace L.et.al.   11516643

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Predict TMSs (Predict number of transmembrane segments)
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FASTA formatted sequence 
1:	MTFLDRTMSF WAVSRGLTPP SKVVPMLNPN QRQFLEDEVR YREKLKLMAR GDAMEEVYVR 
61:	KQETVDDPLE LDKHDSFYQT TKSLLVLFQI MGVMPIHRNP PEKNLPRTGY SWGSKQVMWA 
121:	IFIYSCQTTI VVLVLRERVK KFVTSPDKRF DEAIYNVIFI SLLFTNFLLP VASWRHGPQV 
181:	AIFKNMWTNY QYKFFKTTGS PIVFPNLYPL TWSLCVFSWL LSIAINLSQY FLQPDFRLWY 
241:	TFAYYPIIAM LNCFCSLWYI NCNAFGTASR ALSDALQTTI RGEKPAQKLT EYRHLWVDLS 
301:	HMMQQLGRAY SNMYGMYCLV IFFTTIIATY GSISEIIDHG ATYKEVGLFV IVFYCMGLLY 
361:	IICNEAHYAS RKVGLDFQTK LLNINLTAVD AATQKEVEML LVAINKNPPI MNLDGYANIN 
421:	RELITTNISF MATYLVVLLQ FKITEQRRIG QQQA