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Welcome to the PyMOL Wiki!
The community-run support site for the PyMOL molecular viewer.
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Quick Links
Tutorials Table of Contents Commands
Script Library Plugins FAQ
Gallery | Covers PyMOL Cheat Sheet (PDF) Getting Help
News & Updates
Python 3 New Python 3 compatibility guide for scripts and plugins
Official Release PyMOL v2.3 has been released on February 11, 2019.
POSF New PyMOL fellows announced for 2018-2019
Tutorial Plugins Tutorial updated for PyQt5
New Plugin ProBiS H2O is a new plugin for identification of conserved waters in protein structures.
Selection keywords New polymer.protein and polymer.nucleic selection keywords. Thanks everyone who participated in the poll!
Plugin Update MOLE 2.5 is an updated version of channel analysis software in PyMOL
New Script dssr_block is a wrapper for DSSR (3dna) and creates block-shaped nucleic acid cartoons
Older News See Older News.
Did you know...


fnab builds nucleic acid entities from sequence. The sequence must be specified in one-letter code. Only one fragment can be created at a type (no spaces allowed unlike the 'fab' command).

Similar functionality is also provided by the graphical Builder in "Nucleic Acid" mode.

New in PyMOL version 2.3


fnab input [, name [, type [, form [, dbl_helix ]]]]


  • input = string: Nucleic Acid sequence in one-letter code
  • name = string: name of object to create or modify {default: obj??}
  • mode = string: "DNA" or "RNA" {default: "DNA"}
  • form = string: "A" or "B" {default: "B"}
  • dbl_helix = bool (0/1): flag for using double helix in DNA


# Create default (B-DNA) chain

# Create B-DNA chain with specific name 
fnab ATGCGATAC, name=myDNA, mode=DNA, form=B, dbl_helix=1

# Create RNA chain
fnab AAUUUUCCG, mode=RNA


A Random PyMOL-generated Cover. See Covers.