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Table 1 Comparison of cai operon codified proteins in E. coli and Proteus sp. strains [4,15,19]

From: Production of L-carnitine by secondary metabolism of bacteria

Gene Protein length (aa) Function of gene product Homology (%) Reference
  E. coli Proteus sp.    
caiT 504 504 Transport protein* 88 [20,21]
caiA 380 380 Crotonobetainyl-CoA reductase 93 [16,65]
caiB 405 406 Betainyl-CoA transferase 86 [22,24,25]
caiC 524 518 Betainyl-CoA ligase* 69 [26]
caiD 297 261 Crotonobetainyl-CoA hydratase 82 [24,25,60]
caiE 203 197 Unknown 76 [15,19]
caiF 131 130 Transcriptional regulator* 51 [19,27]
  1. (*) In Proteus sp. strain, function postulated on the basis of sequence similarities [19].