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The scavenging capacity of DMBT1 is impaired by germline deletions
Floris J Bikker1, Caroline End2, Antoon J M Ligtenberg3
1Department of Oral Biochemistry, Academic Centre for Dentistry Amsterdam, University of Amsterdam and VU University Amsterdam, Gustav Mahlerlaan 3004, 1081LA, Amsterdam, Netherlands. fbikker@acta.nl.
Abstract:
The Scavenger Receptor Cysteine-Rich (SRCR) proteins are an archaic group of proteins characterized by the presence of multiple SRCR domains. They are membrane-bound or secreted proteins, which are generally related to host defense systems in animals. Deleted in Malignant Brain Tumors 1 (DMBT1) is a SRCR protein which is secreted in mucosal fluids and involved in host defense by pathogen binding by its SRCR domains. Genetic polymorphism within DMBT1 leads to DMBT1-alleles giving rise to polypeptides with interindividually different numbers of SRCR domains, ranging from 8 SRCR domains (encoded by 6 kb DMBT1 variant) to 13 SRCR domains (encoded by the 8 kb DMBT1 variant). In the present study, we have investigated whether reduction from 13 to 8 amino-terminal SRCR domains leads to reduction of bacterial binding. The 6 kb variant bound ~20-45% less bacteria compared to the 8 kb variant. These results support the hypothesis that genetic variation in DMBT1 may influence microbial defense.
Insights
Genetic variations in Deleted in Malignant Brain Tumors 1 (DMBT1) affect its ability to bind bacteria. Fewer Scavenger Receptor Cysteine-Rich (SRCR) domains in DMBT1 result in reduced bacterial binding, impacting host defense mechanisms.
Area of Science:
- Immunology
- Genetics
- Biochemistry
Background:
- Scavenger Receptor Cysteine-Rich (SRCR) proteins are involved in host defense.
- Deleted in Malignant Brain Tumors 1 (DMBT1) is an SRCR protein found in mucosal fluids, crucial for pathogen binding.
- Genetic variations in DMBT1 result in different numbers of SRCR domains.
Purpose of the Study:
- To investigate if a reduction in amino-terminal SRCR domains of DMBT1 affects bacterial binding.
- To compare the bacterial binding capacity of DMBT1 variants with varying SRCR domain counts.
Main Methods:
- Comparison of bacterial binding between DMBT1 variants with 13 SRCR domains (8 kb variant) and 8 SRCR domains (6 kb variant).
Main Results:
- The DMBT1 variant with 8 SRCR domains (6 kb) exhibited approximately 20-45% less bacterial binding compared to the variant with 13 SRCR domains (8 kb).
Conclusions:
- Reduced number of SRCR domains in DMBT1 leads to decreased bacterial binding capacity.
- Genetic variation in DMBT1 influences the host's defense against microbes.