Nutrient Transport - Exercise #9

You are studying nutrient uptake in E. coli and are curious about the Fe3+ ABC transporter.  You know that fecB is one of the five genes responsible for this ABC transporter.

  1. What are the other three genes that make up this particular iron ABC transporter?

  3. What are the functions of all four genes (be sure to mention what they bind & their affinity/affinities or what reaction they catalyze, if anything!)?

  5. Do the four genes form  an operon?  If in an operon, are there any additional genes (other than the four named)?  Name and describe function(s).

  7. Describe the regulation Fe3+ uptake genes. Is this ABC transporter inducible or not?  If so, name what compound and/or condition induces expression of the genes.

  9. What is the molecular weight of FecB?