🚀 go-pugleaf

How can I bind a key to a function call with an argument?
Here's what I have:

    (define-key mode-specific-map "s" 'latex-sc)
    (define-key mode-specific-map "e" 'latex-em)
    
    (defun latex-sc (&optional arg)
      (interactive "*p")
      (backward-sexp arg)
      (insert-string "{\\sc ")
      (forward-sexp arg)
      (insert-string "}"))

    (defun latex-em (&optional arg)
      (interactive "*p")
      (backward-sexp arg)
      (insert-string "{\\em ")
      (forward-sexp arg)
      (insert-string "}"))

I want to do something like this:

    (define-key mode-specific-map "s" '(latex-cmd "sc"))
    (define-key mode-specific-map "e" '(latex-cmd "em"))
    
    (defun latex-cmd (str  &optional arg)
      (interactive "*s\np")
      (backward-sexp arg)
      (insert-string (concat "{\\" str " "))
      (forward-sexp arg)
      (insert-string "}"))
    

If I can do that, then I don't have to have a bunch of 
defuns that are practically the same.  Besides the syntax 
of the define-key's, the arguments and use w/in (interactive)
aren't correct.  I don't know how to have an optional arg and
required string.

Thanks in advance.

Please email responses.

Alex Tomlinson