Summary: Dr-family adhesin
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Bacterial adhesin Edit Wikipedia article
Bacteria are typically found attached to and living in close association with surfaces. During the bacterial lifespan, a bacterium is subjected to frequent shear-forces. In the crudest sense, bacterial adhesins serve as anchors allowing bacteria to overcome these environmental shear forces, thus remaining in their desired environment. However, bacterial adhesins do not serve as a sort of universal bacterial Velcro. Rather, they act as specific surface recognition molecules, allowing the targeting of a particular bacterium to a particular surface such as root tissue in plants, lacrimal duct tissues in mammals, or even tooth enamel.
Most fimbria of gram-negative bacteria function as adhesins, but in many cases it is a minor subunit protein at the tip of the fimbriae that is the actual adhesin. In gram-positive bacteria, a protein or polysaccharide surface layer serves as the specific adhesin. To effectively achieve adherence to host surfaces, many bacteria produce multiple adherence factors called adhesins.
Bacterial adhesins provide species and tissue tropism. Adhesins are expressed by both pathogenic bacteria and saprophytic bacteria. This prevalence marks them as key microbial virulence factors in addition to a bacterium’s ability to produce toxins and resist the immune defenses of the host.
Through the mechanisms of evolution, different species of bacteria have developed different solutions to the problem of attaching receptor specific proteins to the bacteria surface. Today many different types and subclasses of bacterial adhesins may be observed in the literature.
The typical structure of a bacterial adhesion is that of a fimbria or pili. The bacterial adhesion consists primarily of an intramembranous structural protein which provides a scaffold upon which several extracellular adhesins may be attached. However, as in the case of the CFA1 fimbriae, the structural protein itself can sometimes act as an adhesion if a portion of the protein extends into the ECM.
 FimH Adhesin - Structure
The best characterized bacterial adhesin is the type 1 fimbrial FimH adhesin. This adhesin is responsible for D-mannose sensitive adhesion. The bacterium synthesizes a precursor protein consisting of 300 amino acids then processes the protein by removing several signal peptides ultimately leaving a 279 amino acid protein. Mature FimH is displayed on the bacterial surface as a component of the type 1 fimbrial organelle.
In 1999, the structure of FimH was resolved via x-ray crystallography. FimH is folded into two domains. The N terminal adhesive domain plays the main role in surface recognition while the C-terminal domain is responsible for organelle integration. A tetra-peptide loop links the two domains. Additionally, a carbohydrate-binding pocket has been identified at the tip of the N-terminal adhesive domain. This basic structure is conserved across type 1 fimbrial adhesins though recent studies have shown that in vitro induced mutations can lead to the addition of C-terminal domain specificity resulting in a bacterial adhesion with dual bending sites and related binding phenotypes.
 Adhesins as Virulence Factors
The majority of bacterial pathogens exploit specific adhesion to host cells as their main virulence factor. “A large number of bacterial adhesins with individual receptor specificities have been identified.” Many bacterial pathogens are able to express an array of different adhesins. Expression of these adhesins at different phases during infection play the most important role in adhesion based virulence. Numerous studies have shown that inhibiting a single adhesin in this coordinated effort can often be enough to make a pathogenic bacterium non-virulent. This has led to the exploration of adhesin activity interruption as a method of bacterial infection treatment.
 Vaccines based on Adhesins
The study of adhesins as a point of exploitation for vaccines comes from early studies which indicated that an important component of protective immunity against certain bacteria came from an ability to prevent adhesin binding. Additionally, Adhesins are attractive vaccine candidates because they are often essential to infection and are surface-located, making them readily accessible to antibodies.
The effectiveness of anti-adhesin antibodies is illustrated by studies with FimH, the adhesin of uropathogenic Escherichia coli (UPEC).Work with E. coli stems from observations of human acquired immunity. Children in third world countries may suffer from several episodes of E. coli associated diarrhea during the first three years of life. If the child survives this initial period of susceptibility, infection rates typically drop substantially. Field studies show that this acquired immunity is directed primarily against bacterial adhesins.
Recent studies from Worchester Polytechnic institute show that the consumption of cranberry juice cocktail may inhibit the action of UPEC adhesins. Using atomic force microscopy researchers have shown that adhesion forces decrease with time following cranberry juice cocktail consumption.  This type of research has opened the door to further exploration of orally administered vaccines which exploit bacterial adhesins.
A number of problems create challenges for the researcher exploring the anti-adhesin immunity concept. First and foremost among these problems is the large number of different bacterial adhesins which target the same human tissues. Further problems arise when considering an individual bacterium’s ability to produce multiple different types of adhesins most of which are produced at different times, in different places, and in response to different environmental triggers. Finally, the most pressing problem becomes evident when considering that many adhesins present as different immunologically distinct antigentic varieties, even within the same clone (as is the case in Neisseria gonorrhoeae).
Despite these challenges, progress is being made in the creation of anti-adhesion vaccines. In animal models, passive immunization with anti FimH-antibodies and vaccination with the protein significantly reduced colonization by UPEC. Moreover, the Bordetella pertussis adhesins FHA and pertactin are components of 3 of the 4 acellular pertussis vaccines currently licensed for use in the U.S. Additionally, anti-adhesion vaccines are being explored as a solution to urinary-tract infections] (UTIs). The use of synthetic FimH adhesion peptides was shown to prevent urogenital mucosal infection by [Eschericia Coli|E. coli in mice.
 Specific Examples
 Dr family
|drae adhesin from escherichia coli|
The Dr family of adhesins bind to the Dr blood group antigen component of decay-accelerating factor (DAF). These proteins contain both fimbriated and afimbriated adherence structures and mediate adherence of uropathogenic Escherichia coli to the urinary tract. They do so by inducing the development of long cellular extensions that wrap around the bacteria. They also confer the mannose-resistant hemaglutination phenotype, which can be inhibited by chloramphenicol. The N-terminal portion of the mature protein is thought to be responsible for chloramphenicol sensitivity. Also, they induce activation of several signal transduction cascades, including activation of PI-3 kinase.</ref>
 N. gonorroheae
N. gonorrhoeae is host restricted almost entirely to humans. “Extensive studies have established type 4 fimbrial adhesins of N. gonorrhoeae virulence factors.” These studies have shown that only strains capable of expressing fimbriae are pathogenic. High survival of polymorphonuclear neutrophils (PMNs) characterizes Neisseria gonorrhoeae infections. Additionally, recent studies out of Stockholm have shown that Neisseria can hitchhike on PMNs using their adhesin pili thus hiding them from neutrophil phagocytic activity. This action facilitates the spread of the pathogen throughout the epithelial cell layer. 
 E. coli
Escherichia coli strains most known for causing diarrhea can be found in the intestinal tissue of pigs and humans where they express the K88 and CFA1. to attach to the intestinal lining. Additionally, UPEC causes about 90% of urinary tract infections.  Of those E. coli which cause UTIs, 95% express type 1 fimbriae. FimH in E. coli overcomes the antibody based immune response by natural conversion from the high to the low affinity state. Through this conversion, FimH adhesion may shed the antibodies bound to it. Escherichia coli FimH provides an example of conformation specific immune response which enhances impact on the protein.  By studying this particular adhesion, researchers hope to develop adhesion-specific vaccines which may serve as a model for antibody-mediation of pathogen adhesion. 
 See also
- Coutte L, Alonso S, Reveneau N, Willery E, Quatannens B, Locht C, Jacob-Dubuisson F (2003). "Role of adhesin release for mucosal colonization by a bacterial pathogen". J Exp Med 197 (6): 735–42. doi:10.1084/jem.20021153. PMID 12629063. http://www.jem.org/cgi/content/full/197/6/735.
- Per Klemm, Mark A. Schembri (2000). "Bacterial adhesins: function and structure". International Journal of Medical Microbiology 290 (1): 27–35. http://www.sciencedirect.com/science/article/pii/S1438422100801022.
- Choudhury, D., Thompson, A., Stojanoff, V., Langermann,S., Pinker, J., Hultgren, S. ]., Knight, S. D (1999). "X-ray structure of the FimC-FimHchaperone-adhesin complex from uropathogenic Escherichia coli". Science 285 (1): 1061–66.
- Schembri, M. A., Klemm, P (1998). "Heterobinary ildhesins based on the Escherichia coli FimH fimbrial protein". Applied Environmental Microbiology 64 (1): 1628–33.
- Levine, M. M., Giron, J. A., Noriega, E R (1994). "Fimbrial vaccines.". Fimbriae, adhesion, genetics, biogenesis, and vaccines: 255–270.
- Camesano A.T, Howell A.B., Pinzon-Arango P.A., Tao Y. (2011). "Oral consumption of cranberry juice cocktail inhibits molecular scale adhesion of clinical uropathogenic Escherichia coli". Journal of Medicinal Food 14 (1): 7–8.
- Davies, J. K., Koomey, J. M., Seifert, H. S (1994). "Pili (fimbriae) of Neisseria gonorrhoeae". Fimbriae, adhesion, genetics, biogenesis, and vaccines: 147–155.
- Langermann S, Möllby R, Burlein J, Palaszynski S, Auguste C, DeFusco A, Strouse R, Schenerman M, Hultgren S, Pinkner J, Winberg J, Guldevall L, Söderhäll M, Ishikawa K, Normark S, Koenig S (2000). "Vaccination with FimH adhesin protects cynomolgus monkeys from colonization and infection by uropathogenic Escherichia coli". J Infect Dis 181 (2): 774–8. doi:10.1086/315258. PMID 10669375.
- Langermann, S., Palaszynsky, S., Barnhart, M., Auguste, G., Pinkner, J. S., Burlein, J., Barren, P., Koenig, S., Leath, S., Jones, c. H., Hultgren, S.J (1997). "Prevention of mucosal Escherichia coli infection by FimH-adhesin-based systemic vaccination.". Science 276 (1): 607–611.
- Identified Virulence Factors of UPEC : Adherence, State Key Laboratory for Moleclular Virology and Genetic Engineering, Beijing. Retrieved July 2011
- Zhang L, Foxman B, Tallman P, Cladera E, Le Bouguenec C, Marrs CF (June 1997). "Distribution of drb genes coding for Dr binding adhesins among uropathogenic and fecal Escherichia coli isolates and identification of new subtypes". Infect. Immun. 65 (6): 2011–8. PMC 175278. PMID 9169726. //www.ncbi.nlm.nih.gov/pmc/articles/PMC175278/.
- Swanson TN, Bilge SS, Nowicki B, Moseley SL (January 1991). "Molecular structure of the Dr adhesin: nucleotide sequence and mapping of receptor-binding domain by use of fusion constructs". Infect. Immun. 59 (1): 261–8. PMC 257736. PMID 1670929. //www.ncbi.nlm.nih.gov/pmc/articles/PMC257736/.
- Söderholm N., Vielfort K., Hultenby K., Aro H. (2011). "Pathogenic Neisseria Hitchhike on the Uropod of Human Neutrophils". PLOS.
- Gaastra, W., de Graaf, E K (1992). "Host-specific fimbrial adhesins of noninvasive enterotoxigenic Escherichia coli strains.". Microbiology 46 (1): 129-.
- Tchesnokova V, Aprikian P, Kisiela D, Gowey S, Korotkova N, Thomas W, and Sokurenko E (2011). "Type 1 Fimbrial Adhesin FimH Elicits an Immune Response that Enhances Cell Adhesion of Escheircia coil". Infection and Immunity 79 (10): 3895–3904.
Adhesins are also used in cell communication, and bind to surface communicators. Can also be used to bind to other bacteria.
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Dr-family adhesin Provide feedback
This family of adhesins bind to the Dr blood group antigen component of decay-accelerating factor. This mediates adherence of uropathogenic Escherichia coli to the urinary tract. This family contains both fimbriated and afimbriated adherence structures . This protein also confers the phenotype of mannose-resistant hemagglutination, which can be inhibited by chloramphenicol. The N terminal portion of the protein is though to be responsible for chloramphenicol sensitivity .
Zhang L, Foxman B, Tallman P, Cladera E, Le Bouguenec C, Marrs CF; , Infect Immun 1997;65:2011-2018.: Distribution of drb genes coding for Dr binding adhesins among uropathogenic and fecal Escherichia coli isolates and identification of new subtypes. PUBMED:9169726 EPMC:9169726
Swanson TN, Bilge SS, Nowicki B, Moseley SL; , Infect Immun 1991;59:261-268.: Molecular structure of the Dr adhesin: nucleotide sequence and mapping of receptor-binding domain by use of fusion constructs. PUBMED:1670929 EPMC:1670929
External database links
This tab holds annotation information from the InterPro database.
InterPro entry IPR006713The Dr family of adhesins bind to the Dr blood group antigen component of decay-accelerating factor. These proteins contain both fimbriated and afimbriated adherence structures and mediate adherence of uropathogenic Escherichia coli to the urinary tract [PUBMED:9169726]. They also confer the mannose-resistant hemagglutination phenotype, which can be inhibited by chloramphenicol. The N-terminal portion of the mature protein is thought to be responsible for chloramphenicol sensitivity [PUBMED:1670929].
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1Cannot generate PP/Heatmap alignments for seeds; no PP data available
Key: available, not generated, — not available.
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|Number in seed:||6|
|Number in full:||61|
|Average length of the domain:||136.70 aa|
|Average identity of full alignment:||49 %|
|Average coverage of the sequence by the domain:||86.71 %|
|HMM build commands:||
build method: hmmbuild -o /dev/null HMM SEED
search method: hmmsearch -Z 23193494 -E 1000 --cpu 4 HMM pfamseq
|Family (HMM) version:||7|
|Download:||download the raw HMM for this family|
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Unmapped species names
The tree is built by looking at each sequence in the full alignment for the family. We take the name of the species given by UniProt and try to map that to the full taxonomic tree from NCBI. In some cases, the name chosen by UniProt does not map to any node in the NCBI tree, perhaps because the chosen name is listed as a synonym or a misspelling in the NCBI taxonomy.
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The tree shows the occurrence of this domain across different species. More...
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For all of the domain matches in a full alignment, we count the number that are found on all sequences in the alignment. This total is shown in the purple box.
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We use the NCBI species tree to group organisms according to their taxonomy and this forms the structure of the displayed tree. Note that in some cases the trees are too large (have too many nodes) to allow us to build an interactive tree, but in most cases you can still view the tree in a plain text, non-interactive representation. Those species which are represented in the seed alignment for this domain are highlighted.
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There is 1 interaction for this family. More...
We determine these interactions using iPfam, which considers the interactions between residues in three-dimensional protein structures and maps those interactions back to Pfam families. You can find more information about the iPfam algorithm in the journal article that accompanies the website.
For those sequences which have a structure in the Protein DataBank, we use the mapping between UniProt, PDB and Pfam coordinate systems from the PDBe group, to allow us to map Pfam domains onto UniProt sequences and three-dimensional protein structures. The table below shows the structures on which the Adhesin_Dr domain has been found. There are 49 instances of this domain found in the PDB. Note that there may be multiple copies of the domain in a single PDB structure, since many structures contain multiple copies of the same protein seqence.
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