Methods of identifying a compound that inhibit, enhance and/or misdirect assembly of a viral capsid include providing fluorescently-labeled capsid polypeptides labeled with a fluorescent dye that changes fluorescence at high concentration, wherein assembly of the capsid polypeptides into the viral capsid results in juxtaposition of at least one of the N-terminus and C-terminus of the capsid polypeptides. In vitro assembly reactions are performed utilizing the labeled capsid polypeptide in the presence of the at least one test compound, and an amount of fluorescence is detected at at least one time point following induction of assembly, wherein the induction of assembly is detected as a change in the fluorescence of the sample. It is then determined whether the change in fluorescence detected in the presence of the at least one test compound following induction of assembly is decreased, increased, or occurs at a fast rate when compared to the fluorescence detected in the absence of the at least one test compound, wherein such decrease is an indication that the at least one test compound interferes with assembly of the viral capsid.