AN X-RAY-ABSORPTION STUDY OF CHEMICALLY-MODIFIED BACTERIAL PHOTOSYNTHETIC REACTION CENTERS

被引：23

作者：

CHEN, LX

WANG, ZY

HARTWICH, G

KATHEDER, I

SCHEER, H

SCHERZ, A

MONTANO, PA

NORRIS, JR

机构：

[1] UNIV CHICAGO,DEPT CHEM,CHICAGO,IL 60637

[2] UNIV MUNICH,INST BOT,W-8000 MUNICH,GERMANY

[3] WEIZMANN INST SCI,DEPT BIOCHEM,IL-76100 REHOVOT,ISRAEL

[4] ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439

[5] UNIV ILLINOIS,DEPT PHYS,CHICAGO,IL

来源：

CHEMICAL PHYSICS LETTERS | 1995年 / 234卷 / 4-6期

关键词：

D O I：

10.1016/0009-2614(95)00038-6

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Local structures around metal atoms in Ni and Zn substituted 13(2)-hydroxy-bacteriochlorophyll a (Ni-HOB, and Zn-HOB) with and without insertion into the accessory bacteriochlorophyll a (BChla) sites in Rhodobacter sphaeroides photosynthetic reaction centers (RC) are studied using X-ray absorption spectroscopy. The penta-coordination of Ni-HOB and Zn-HOB in the RC is similar to that of BChl a in native RC, where the fifth ligand is from a nearby histidine residue. Average Ni-N and Zn-N distances increase by 0.08 Angstrom in Ni-HOB and decrease by 0.04 Angstrom in Zn-HOB-Et(2)O as the modified chlorophylls bind with the RC due to the interaction between the protein and the macrocycle.

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收藏

页码：437 / 444

页数：8

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