According to the PNAS "info for authors",

"Authors must recommend three appropriate Editorial Board members,
three NAS members who are expert in the paper's scientific area, and
five qualified reviewers."

After asking the PNAS staff for clarification, this appears to mean we
need three Editorial Board members (one of which will be quickly
located to judge whether our article is PNAS-worthy and select
editors):

http://www.pnas.org/site/misc/masthead.shtml

and three NAS member editors who might be qualified to serve as
editors for our paper:

http://nrc88.nas.edu/pnas_search/

as well as five people (not be at our institutions) who could act as reviewers.

Here's my best initial guess, with question marks denoting uncertainty:

EDITORIAL BOARD

David Chandler
Michael J. Klein
Michael Levitt
David Baker

MEMBER EDITORS:

David Chandler
Ken A. Dill
Attila Szabo
Bruce J. Berne
Robert Zwanzig
Ben Widom
Martin Karplus
Rudolph A. Marcus

SUITABLE REFEREES

Michael Shirts (IBM Almaden)
Jed Pitera (IBM Almaden)
Vijay Pande (Stanford)
Gerhard Hummer (NIH)
Thomas J. Miller, III (Caltech)
Adrian Roitberg (Florida)
Zhiqiang Tan (Rutgers)
Bill Swope (IBM Almaden)
Jesœs Izaguirre (Notre Dame)
Aaron Dinner (U Chicago)
Beno”t Roux (U Chicago)
Harry Stern (Rochester)
M. Scott Shell (UCSB)
Scott Schmidler (Duke)
Tom Woolf (John Hopkins)
Dan Zuckerman (Pitt)
F. Marty Ytreberg (Idaho)
Andrew McCammon (UCSD)
Jun S. Liu (Harvard)
Ilja Siepmann (UMN)
Juan dePablo (Madison)