Aerobe or facultative anaerobe organism that metabolizes acetate?
You could try Paracoccus denitrificans.

Here is a study where acetate is used as the growth-limiting substrate: http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.320.1692&amp;rep=rep1&amp;type=pdf

Here's the details of its version of acetate kinase: http://www.uniprot.org/uniprot/A1B9S8

I'd be happy to collaborate with you further on this.