AMBER: The default of HIS in leaprc : HID or HIE ?

From: Jiten <>
Date: Wed, 5 Oct 2005 01:21:52 +0900

Dear Amber users.

The default of HIS in leaprc in amber8 is HIE (it was HID in amber7). However, in amber8 manual it is mentioned that

Histidine can exist either as the protonated species or as a neutral species with a hydrogen at

the delta or epsilon position. For this reason, the histidine UNIT/RESIDUE name is either HIP,

HID, or HIE (but not HIS). The default "leaprc" file assigns the name HIS to HID. Thus, if a

PDB file is read that contains the residue HIS, the residue will be assigned to the HID UNIT

object. This feature can be changed within one's own "leaprc" file.

Which one is bettrer option for most proteins?

N. Jiten Singh
C/O Prof. Kwang S. Kim
Department of Chemistry
Pohang University of Science and Technology
San 31, Hyojadong, Namgu
Pohang 790-784, Korea
Phone : 82-54-279-5853 ( Lab ) / 279-4138 ( Appt )
Fax : 82-54-279-8137 (or +82-54-279-3399)
Web : and
Home Page :

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Received on Tue Oct 04 2005 - 17:53:01 PDT
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