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3.A.13.1.1
The f1 assembly/export channel of 348 aas and possibly 3 TMSs at residues 130, 155 and 240.

Accession Number:P03657
Protein Name:VG1 aka I
Length:348
Molecular Weight:39528.00
Species:Bacteriophage f1 [10863]
Number of TMSs:2
Location1 / Topology2 / Orientation3: Host membrane1 / Single-pass membrane protein2
Substrate

Cross database links:

Gene Ontology

GO:0033644 C:host cell membrane
GO:0016021 C:integral to membrane
GO:0005524 F:ATP binding
GO:0019067 P:viral assembly, maturation, egress, and rel...

References (3)

[1] “Nucleotide sequence and genome organisation of filamentous bacteriophages f1 and fd.”  Beck E.et.al.   6282703
[2] “Nucleotide sequence of bacteriophage f1 DNA.”  Hill D.F.et.al.   6292494
[3] “A trans-envelope protein complex needed for filamentous phage assembly and export.”  Feng J.N.et.al.   10564514

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Predict TMSs (Predict number of transmembrane segments)
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FASTA formatted sequence 
1:	MAVYFVTGKL GSGKTLVSVG KIQDKIVAGC KIATNLDLRL QNLPQVGRFA KTPRVLRIPD 
61:	KPSISDLLAI GRGNDSYDEN KNGLLVLDEC GTWFNTRSWN DKERQPIIDW FLHARKLGWD 
121:	IIFLVQDLSI VDKQARSALA ENVVYCRRLD RITLPFVGTL YSLITGSKMP LPKLHVGVVK 
181:	YGDSQLSPTV ERWLYTGKNL YNAYDTKQAF SSNYDSGVYS YLTPYLSHGR YFKPLNLGQK 
241:	MKLTKIYLKK FSRVLCLAIG FASAFTYSYI TQPKPEVKKV VSQTYDFDKF TIDSSQRLNL 
301:	SYRYVFKDSK GKLINSDDLQ KQGYSLTYID LCTVSIKKGN SNEIVKCN