BIOINORGANIC CHEMISTRY A Short Course Second Edition

MAGNESIUM AND CATALYTIC RNA 271

Selected Bond Distances PDB: 301D ( Å ) pH = 8.5

A9 – G10.1

region

Mg

2+ – O

Mg

2+

• N

N

G 7

10.1

• O

1P

A

(^9)
P G
10.1

• O

G 1

10.1

P G

10.1

• O

G 2

10.1

P G

10.1

• O3

′ A

(^9)
P G
10.1

• O5

′

G

10.1

Mg(877) (Site

2) – O(236) O

1P

A

9.0

7.08

Mg(877) (Site

2) – N(271) N

G 7

10.1

8.27

N(271) – O(236)

O

1P

A

9.0

4.42

P(257) – O(258)

1.50

P(257) – O(259)

1.49

P(257) – O(243)

1.61

P(257) – O(260)

1.59

C17.0 – A1.1

region(cleavagesite)

Mg

2+ – O

Mg

2+

• N

P A

1.1

• O

A 1

1.1

P A

1.1

• O

A 2

1.1

P A

1.1

• O3

′ C

17.0

P A

1.1

• O5

′ A

1.1

Mg(880) (Site

6) – O(773) O

, 2P

pro – R

, A p

1.1

2.43

Mg(880) (Site

6) – N(785) N

A 7

1.1

4.48

P(771) – O(772)

1.50

P(771) – O(773)

1.49

P(771) – O(759)

1.63

P(771) – O(774)

1.59

Selected Bond Distances (

Å )

PDB: Accession

number

M e – M e

P – P

299D

P(771) – P(235)

20.6

300D

Mn(876)

a –

Mn(875) 13.7

P(234) – P(770)

20.7

301D

Mg(877) –

Mg(878) 10.5

P(771) – P(235)

19.6

Mg(876) –

Mg(880) 4.46 Å

a Numbers in parentheses are atom numbers from the Protein Data Bank (PDB) fi

les.