This is a summary of information I collected in 2007 for dyes that could be used with 405 nm laser excitation.
Molecular Probes has some nice options that fill this niche (for a general overview see the Handbook):
|Alexa Fluor 405||402nm||421nm|
The Alexa 405 and Pacific Blue dyes should work well with the existing blue channel on our confocals; with the Pacific Orange and Cascade Yellow dyes it may be possible to use the 405nm laser excitation with green detection enabling multiplexing.
All of these are available as antibody conjugates except Cascade Yellow. For a table of available antibody conjugates, see http://probes.invitrogen.com/handbook/tables/0324.html
Atto 425 outperforms Pacific Blue and Alexa 405 as phalloidin conjugates under 405 nm excitation (Eric Griffis, U. Dundee, on Confocal listserv).
Dylight 405 is another Alexa 405 substitute.
Brilliant violet is a new dye in this spectral region that claims to be much brighter.