This family contains the bacterial Ornithine cyclodeaminase enzyme EC:4.3.1.12, which catalyses the deamination of ornithine to proline [1]. This family also contains mu-Crystallin the major component of the eye lens in several Australian marsupials, mRNA for this protein has also been found in human retina [2].

1: Ornithine cyclodeaminase from octopine Ti plasmid Ach5: identification, DNA sequence, enzyme properties, and comparison with gene and enzyme from nopaline Ti plasmid C58. Schindler U, Sans N, Schroder J; J Bacteriol 1989;171:847-854. PMID:2644238

2: mu-crystallin is a mammalian homologue of Agrobacterium ornithine cyclodeaminase and is expressed in human retina. Kim RY, Gasser R, Wistow GJ; Proc Natl Acad Sci U S A 1992;89:9292-9296. PMID:1384048