I am a research associate at CALIT2 at the University of California, San Diego. I am interested in large scale analyses of protein function and structure. Proteins facilitate virtually all of life's processes: from the immune system to embryonic development, from metabolism to cell division, proteins act by binding to other molecules, serving as structural elements of organisms, catalyzing reactions, and regulating processes on various levels. On the one hand, Protein structures are diverse and complex, attesting to the many roles these molecules play in facilitating life. On the other, there are intriguing commonalities even among the most different proteins. Most importantly, we are inundated with data coming at us from genomics projects, which in many cases provides us with little real information as to what these proteins do. All this presents the computational biologist with unique challenges and opportunities.

Structural Signatures
I am interested in locating ``structural signatures'' that span different protein folds. My working hypothesis is that there are short local structural commonalities between proteins that otherwise share no obvious structure or function. Detecting these commonalities can help us understand protein evolution, folding, and design. [1] ,  [2]

Different Representations of Protein Structures
The computational representation of a protein's 3D structure is a challenging problem because of varying and often conflicting considerations: at first sight it seems that as far as information is concerned, more is better, hence the drive to atomic level description. However, elaboration on the atomic level can be very ``noisy'' and be time and memory intensive. Therefore we often ask what is the minimal information we need to achieve a specific task, without going into the unnecessary detail of representing each and every atom. I am interested in different computational representations of protein structures suitable for different tasks. In one study we have shown that a 1D representation of protein structures can be used for fast database searching and alignments, and still preserve relevant structural information. [3].

Function Prediction
Another interest of mine is the prediction of protein function. Genomics, proteomics and various other ``-omics'' inundate us with sequence and structure information, but the biological functions of those proteins in many cases still eludes us. Computational prediction of protein and gene function is a new and rapidly growing research field in bioinformatics [4]. I am the co-organizer of the automated computational protein function prediction meetings: AFP. The AFP meetings bring together researchers to discuss various methods for protein function prediction. A short article on AFP 2006. My personal interest in function prediction lies in selecting targets for structural genomics, based on their predicted function [5]. I have recently started work on predicting gene function based on its genomic context in bacteria. I am using both genomic and metagenomic data towards that end.