HMM Summary Page: TIGR04226

Functionfimbrial isopeptide formation D2 domain
Trusted Cutoff30.00
Domain Trusted Cutoff30.00
Noise Cutoff28.00
Domain Noise Cutoff20.00
Isology Typedomain
HMM Length123
AuthorHaft DH
Entry DateNov 15 2011 11:30AM
Last ModifiedNov 16 2011 12:58PM
CommentThe Streptococcus Pneumoniae pilus backbone protein, RrgB, has three tandem domains with Lys-to-Asn isopeptide bonds, but these three regions are extremely divergent in sequence. This model represents the homology domain family of the D2 domain. It occurs just once in many surface proteins but up to twenty times in some pilin subunit proteins. Three of every four members have the typical Gram-positive C-terminal motif, LPXTG, although in many cases this motif may be involved in pilin subunit cross-linking rather than cell wall attachment. Proteins with this domain include fimbrial proteins with lectin-like adhesion functions, and the majority of characterized members are involved in surface adhesion to host structures.
ReferencesRN [1] RM PMID:20559564 RT Supramolecular organization of the repetitive backbone unit of the Streptococcus pneumoniae pilus. RA Spraggon G, Koesema E, Scarselli M, Malito E, Biagini M, Norais N, Emolo C, Barocchi MA, Giusti F, Hilleringmann M, Rappuoli R, Lesley S, Covacci A, Masignani V, Ferlenghi I RL PLoS One. 2010 Jun 15;5(6):e10919.RN [2] RM PMID:2900829 RT Cloning and nucleotide sequence of a gene for Actinomyces naeslundii WVU45 type 2 fimbriae. RA Yeung MK, Cisar JO RL J Bacteriol. 1988 Sep;170(9):3803-9.