Members of this protein family are predicted lipoproteins, exclusive to the Bacteroidetes phylum. Proteins in this family are typically between 155 and 167 amino acids in length. Members include GldH, a protein linked to a type of rapid surface gliding motility found in certain Bacteroidetes, such as Flavobacterium johnsoniae and Cytophaga hutchinsonii [1]. Gliding motility appears closely linked to chitin utilization in the model species Flavobacterium johnsoniae. Not all Bacteroidetes with members of this protein family may have gliding motility.

1: Flavobacterium johnsoniae GldH is a lipoprotein that is required for gliding motility and chitin utilization. McBride MJ, Braun TF, Brust JL; J Bacteriol. 2003;185:6648-6657. PMID:14594839