Homologs of GFF4758 from Xanthobacter sp. DMC5
Vitamin B12 import ATP-binding protein BtuD
KEGG: putative spermidine/putrescine transport system ATP-binding protein
Top 100 hits from BLASTp (E < 0.01)
Or try PaperBLAST, fast.genomics, the ENIGMA genome browser, or the comparative fitness browser