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# Accession Number:

## ADA193114

# Title:

## Normal Mode Calculation for Methylated Z-DNA Poly(dG-m5dC).(dG-m5dC).

# Descriptive Note:

## Technical rept. Apr 81-Mar 88,

# Corporate Author:

## PURDUE UNIV LAFAYETTE IND DEPT OF PHYSICS

# Report Date:

## 1988-03-10

# Pagination or Media Count:

##
18.0

# Abstract:

## Normal modes of methylated deoxyribonucleic acid Z-DNA polydG-m5-dC dG-m5dC are computed by helix lattice dynamics. Good agreement with Raman spectral data is obtained. We discuss improvements in the formulation of the problem which allow us to greatly reduce the size of the matrix used. This leads to greatly reduced calculation times. The improvements come from using knowledge of the C2 and time reversal symmetries. Theoretical Formalism Let us consider an infinite double-helical molecule. The helical symmetry axis is taken as Z axis in cartesian coordinates. Helical symmetry implies that each unit cell is transformed geometrically into the next by the operation Hp, psi where p is the pitch along Z-axis and psi is the pitch angle about Z-axis.

# Distribution Statement:

## APPROVED FOR PUBLIC RELEASE

#