Background
Prior to joining ÄÛÌïÑо¿Ôº¹ÙÍø in 2012, Brian Callahan earned a BS in biology magna cum laude from SUNY Cortland (1997), a PhD in biochemistry and biophysics from the University of North Carolina at Chapel Hill (2005), then completed six years of postdoctoral training first at UNC, followed by stints at the Wadsworth Center (NY) and the University at Albany (NY). His primary research mentors during those training periods were National Academy of Sciences members Richard Wolfenden (UNC) and Marlene Belfort (UAlbany).
Research Overview
Research in the Callahan lab blends chemistry and biology. They pursue challenging scientific problems that are relevant to human health and disease yet understudied. Projects can be hypothesis-driven or more technology-focused. The lab’s current work concentrates on the unusual biogenesis of hedgehog proteins, a family of cholesterol-modified hormones that function physiologically during embryo development and patho-physiologically during a variety of cancers.
In general, the lab’s research projects follow three phases:
- Understand the chemistry of a biomolecular transformation
- Apply that understanding to devise novel means to control the transformation with small molecules and/or mutagenesis
- Integrate this synthetically controlled transformation into living cells and eventually into multicellular organisms to address significant questions in biomedicine.
Students in the Callahan lab work directly with the PI on designing experiments, interpreting results and writing up their findings. Research projects are most often led by a graduate student; however, undergraduate students in the group continue to make key contributions to the program. Accordingly, undergraduate students have co-authored several publications from the lab.
The Callahan lab is committed to sharing the results of its research through presentations at scientific meetings and peer-reviewed publications. Representative publications from the group are provided below. To date, three of their papers have been selected as cover features by the respective journal editors.
Since establishing the lab in 2012, Callahan has received generous financial support from the Department of Defense, the National Cancer Institute (NIH), the National Institute of Allergy and Infectious Disease (NIH), NYS-DOH and the Research Foundation of SUNY, along with internal grants from ÄÛÌïÑо¿Ôº¹ÙÍø. The lab is grateful to all these agencies and institutions for their commitment to scientific research and science education.
Research techniques
Recombinant protein expression; analytical chromatography; enzyme kinetic assays; protein engineering; synthetic chemistry; small molecule screening; bioconjugation; mammalian cell culture; flow cytometry; fluorescence microscopy; photoaffinity labeling.
Scientific collaborations
Between the Callahan lab, the Department of Chemistry and the Health Science Core Facility at ÄÛÌïÑо¿Ôº¹ÙÍø, there is a wide diversity of contemporary instrumentation and scientific expertise available. To further expand their capabilities, they have established external collaborations with leaders in drug discovery at the NIH, structural biology at RPI and natural product chemistry at SUNY-ESF. The lab greatly enjoys these partnerships and is always looking to expand its scientific network.
Accepting BCCB graduate students
Recent publications
- Xu Z, Zhang X, Pal C, Rozners E, Callahan BP. Enzyme Fragment Complementation Driven by Nucleic Acid Hybridization. Bioorganic Chemistry 2025 154, 108039.
- Callahan BP, Xu Z. There's more to enzyme antagonism than inhibition. Bioorg Med Chem. 2023 Mar 15;82:117231. doi: 10.1016/j.bmc.2023.117231 (Review)
- Ciulla DA, Xu Z, Pezzullo JL, Dranchak P, Wang C, Giner JL, Inglese J, Callahan BP. Paracatalytic induction: Subverting specificity in hedgehog protein autoprocessing with small molecules. Methods Enzymol. 2023;685:1-41. (Book Chapter)
- A cell-based bioluminescence reporter assay of human Sonic Hedgehog protein autoprocessing to identify inhibitors and activators. Ciulla DA, Dranchak P, Pezzullo JL, Mancusi RA, Psaras AM, Rai G, Giner JL, Inglese J, Callahan BP. J Biol Chem. 2022 Dec;298(12):102705.
Teaching Interests
Courses taught
- BCHM-403 – Biochemistry
- BCHM-426 – Biochemistry Lab
- BCHM-480 – Biochemistry Senior Seminar
- BCHM-508 – Advanced Methods in Biochemistry
- CHEM-483/583 – Enzymes Structure/Function