>gnl|CDD|132455 TIGR03414, ABC_choline_bnd, choline ABC transporter, periplasmic binding protein. Partial phylogenetic profiling (PubMed:16930487) vs. the genome property of glycine betaine biosynthesis from choline consistently reveals a member of this ABC transporter periplasmic binding protein as the best match, save for the betaine biosynthesis enzymes themselves. Genomes often carry several paralogs, one encoded together with the permease and ATP-binding components and another encoded next to a choline-sulfatase gene, suggesting that different members of this protein family interact with shared components and give some flexibility in substrate. Of two members from Sinorhizobium meliloti 1021, one designated ChoX has been shown experimentally to bind choline (though not various related compounds such as betaine) and to be required for about 60 % of choline uptake. Members of this protein have an invariant Cys residue near the N-terminus and likely are lipoproteins. Length = 290

Score = 390 bits (1003), Expect = e-109 Identities = 136/283 (48%), Positives = 192/283 (67%), Gaps = 3/283 (1%) Query: 19 ARDADSCTPVRFADTGWTDIAATTAMTSVILEEILGYKTNIKLLAVPVTFRSLKNKGIDI 78 A + SC VRFAD GWTDI ATTA+ SV+LE LGY+ + LL+VPVT+ LK+ +D+ Sbjct: 1 AAEPASCKTVRFADVGWTDITATTALASVLLEG-LGYQPKVTLLSVPVTYAGLKDGDLDV 59 Query: 79 FMGYWYPSLEKFIAPYLEEGSIKLVAENLQGAKYMLAVNDVGFALGIKSYQDIAKYKKEL 138 F+G W P++E I PYLE GS++++ NL+GAKY LAV G+KS+ DIAK+K +L Sbjct: 60 FLGNWMPAMEPDIKPYLESGSVEVLGPNLEGAKYTLAVPTYVADAGLKSFADIAKFKDKL 119 Query: 139 GAKIYGIEPGNEGNQRILDMINNNKFSLKGFRLIEASELASFSQIRRDQRNNIPAVFLSW 198 KIYGIEPGN+GN+ I MI+ N F L GF+L+E+SE +Q+ R + VFL W Sbjct: 120 DGKIYGIEPGNDGNRLIQKMIDKNAFGLGGFKLVESSEAGMLAQVARAVKRKEWVVFLGW 179 Query: 199 EPHPINSDLNIHYLPGGEEISG--FGEASVYTVVRSDYLDKCPNISRLLKNIKFSVALEN 256 EPHP+N++ + YL GG++ G +G A+VYT R Y +CPN+ +LL N+ F++ +EN Sbjct: 180 EPHPMNTNFKMTYLTGGDDYFGPNYGGATVYTNTRKGYAAECPNVGKLLTNLTFTLDMEN 239 Query: 257 EMMKLILNNKQDRQFVGRTMLRTHPDLLKNWLIGVTTFDGQDP 299 ++M ILN+ +D + R L+ +P++L WL GVTT DG+D Sbjct: 240 QIMGAILNDGKDPEAAARQWLKANPEVLDPWLAGVTTVDGKDG 282

RPSBLAST alignment for GI: 254780342 and conserved domain: TIGR03414